Happy Horse 1.0 API - T2V, I2V, R2V, Video Edit API: Pricing, Documentation

Happy Horse 1.0 API allows for the creation of cinematic clips in high definition, supporting various professional workflows such as character-consistent generation and multilingual lip-syncing. Designed for high-speed performance, it enables developers to integrate rapid, high-fidelity video synthesis into third-party applications and creative tools.

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Happy Horse 1.0 API Documentation

https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseT2VRequest

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Text to Video - Happy Horse API

Request Code

POST https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseT2VRequest
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "prompt": "A small cardboard train running through a tiny city at night"
}

import requests

url = "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseT2VRequest"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
    "prompt": "A small cardboard train running through a tiny city at night"
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseT2VRequest';
const headers = {
  'Content-Type': 'application/json',
  'Cache-Control': 'no-cache',
  'Ocp-Apim-Subscription-Key': 'YOUR_SUBSCRIPTION_KEY'
};
const data = {
  prompt: 'A small cardboard train running through a tiny city at night'
};

fetch(url, {
  method: 'POST',
  headers: headers,
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -v -X POST "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseT2VRequest" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "prompt": "A small cardboard train running through a tiny city at night"
  }'

Output

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Add the X-Webhook-URL header to your submit request to receive a POST callback when the job completes — no polling required.

Using curl? These are HTTP request headers — pass each with -H, e.g. -H "X-Webhook-URL: https://your-server.com/webhook/callback". Do not paste them as bare lines, and end every line of a multi-line command with \.

Webhook Headers

Header	Required	Default	Description
`X-Webhook-URL`	Yes (to enable)	—	HTTPS endpoint on your server that will receive the `POST` callback. Must respond `2xx` within a few seconds (process async if needed).
`X-Webhook-Mode`	No	`terminal`	`terminal` — fires once at the final status (`COMPLETED`/`FAILED`/`ERROR`). `sync` — fires on every poll cycle plus the terminal event, and caps the queue’s polling delay at 15s for tighter progress updates.

Example: enable webhook

X-Webhook-URL: https://your-server.com/webhook/callback
X-Webhook-Mode: terminal

Callback Payload

Your endpoint receives a POST application/json with the same shape as the GET /v2/requests/status/{request_id} response. Example terminal callback (mode terminal):

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-05-22T13:17:32.110Z",
  "updated_at": "2026-05-22 13:19:23",
  "completed_at": "2026-05-22 13:19:23"
}

Failure callback shape

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null,
  "created_at": "...",
  "updated_at": "...",
  "completed_at": "..."
}

Delivery semantics

terminal mode (default) — exactly one POST when the request reaches a terminal status. No callback during PROCESSING.
sync mode — POST on every status poll (with delay capped at ~15s) plus a final POST at terminal status. Use when you want progress updates.
Idempotency — use request_id as your idempotency key. Network retries can deliver the same callback more than once; your handler must tolerate duplicates.
Response — respond 200 OK within a few seconds. The queue does not block on slow handlers, but persistent failures may stop further deliveries.
HTTPS required — plain http:// URLs are rejected.

Request Parameters - Text to Video

Parameter	Required	Type	Default	Allowed values / range	Description
prompt	Yes	string	—	non-empty; ≤ 5000 latin chars / 2500 Chinese chars (truncated past)	Text description of the desired video
resolution	No	string	"1080P"	"720P", "1080P"	Output video resolution
ratio	No	string	"16:9"	"16:9", "9:16", "1:1", "4:3", "3:4"	Output aspect ratio
duration	No	integer	5	3–15 (seconds)	Length of generated video in seconds
watermark	No	boolean	false	true, false	Add a "HappyHorse" watermark in the lower-right corner of the output
seed	No	integer	random	0–2147483647	Random seed for reproducibility. Note: same seed does not guarantee identical output (generation is probabilistic)

Example Request

{
  "prompt": "A small cardboard train running through a tiny city at night",
  "resolution": "1080P",
  "ratio": "16:9",
  "duration": 15,
  "watermark": false,
  "seed": 42
}

Response

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_SUBSCRIPTION_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'happy-horse-1-0' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-04-07T10:00:00.000Z",
  "updated_at": "2026-04-07T10:02:30.000Z",
  "completed_at": "2026-04-07T10:02:30.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Happy Horse 1.0 API Pricing

Resolution	Duration	Price (USD)
720P	1s	~~$0.14~~$0.098
1080P	1s	~~$0.24~~$0.168

Happy Horse 1.0 API Documentation

https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseI2VRequest

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Image to Video - Happy Horse API

Request Code

POST https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseI2VRequest
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "input": {
    "media": [
      { "type": "first_frame", "url": "https://cdn.translate.alibaba.com/r/wanx-demo-1.png" }
    ]
  }
}

import requests

url = "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseI2VRequest"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
    "input": {
        "media": [
            {"type": "first_frame", "url": "https://cdn.translate.alibaba.com/r/wanx-demo-1.png"}
        ]
    }
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseI2VRequest';
const headers = {
  'Content-Type': 'application/json',
  'Cache-Control': 'no-cache',
  'Ocp-Apim-Subscription-Key': 'YOUR_SUBSCRIPTION_KEY'
};
const data = {
  input: {
    media: [
      { type: 'first_frame', url: 'https://cdn.translate.alibaba.com/r/wanx-demo-1.png' }
    ]
  }
};

fetch(url, {
  method: 'POST',
  headers: headers,
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -v -X POST "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseI2VRequest" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "input": {
      "media": [
        { "type": "first_frame", "url": "https://cdn.translate.alibaba.com/r/wanx-demo-1.png" }
      ]
    }
  }'

Output

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Add the X-Webhook-URL header to your submit request to receive a POST callback when the job completes — no polling required.

Webhook Headers

Header	Required	Default	Description
`X-Webhook-URL`	Yes (to enable)	—	HTTPS endpoint on your server that will receive the `POST` callback. Must respond `2xx` within a few seconds (process async if needed).
`X-Webhook-Mode`	No	`terminal`	`terminal` — fires once at the final status (`COMPLETED`/`FAILED`/`ERROR`). `sync` — fires on every poll cycle plus the terminal event, and caps the queue’s polling delay at 15s for tighter progress updates.

Example: enable webhook

X-Webhook-URL: https://your-server.com/webhook/callback
X-Webhook-Mode: terminal

Callback Payload

Your endpoint receives a POST application/json with the same shape as the GET /v2/requests/status/{request_id} response. Example terminal callback (mode terminal):

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-05-22T13:17:32.110Z",
  "updated_at": "2026-05-22 13:19:23",
  "completed_at": "2026-05-22 13:19:23"
}

Failure callback shape

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null,
  "created_at": "...",
  "updated_at": "...",
  "completed_at": "..."
}

Delivery semantics

terminal mode (default) — exactly one POST when the request reaches a terminal status. No callback during PROCESSING.
sync mode — POST on every status poll (with delay capped at ~15s) plus a final POST at terminal status. Use when you want progress updates.
Idempotency — use request_id as your idempotency key. Network retries can deliver the same callback more than once; your handler must tolerate duplicates.
Response — respond 200 OK within a few seconds. The queue does not block on slow handlers, but persistent failures may stop further deliveries.
HTTPS required — plain http:// URLs are rejected.

Request Parameters - Image to Video

Parameter	Required	Type	Default	Allowed values / range	Description
`input`	Yes	object	—	—	Container for prompt + media
`input.prompt`	No	string	—	any language; ≤ 5000 latin chars / 2500 Chinese chars (truncated past)	Describe motion, not the subject — the image already provides the subject
`input.media`	Yes	array	—	exactly 1 element	First-frame entry — see sub-fields below
`input.media[].type`	Yes	string	—	"first_frame"	Only valid value for I2V
`input.media[].url`	Yes	string	—	publicly reachable HTTP(S) URL of JPEG/JPG/PNG/WEBP. Min 300×300 px. Aspect 1:2.5 to 2.5:1. Max 10 MB	First frame image URL
`parameters`	No	object	{}	—	Container for tuning options
`parameters.resolution`	No	string	"1080P"	"720P", "1080P"	Output video resolution
`parameters.duration`	No	integer	5	3–15 (seconds)	Length of generated video in seconds
`parameters.watermark`	No	boolean	false	true, false	Add a "HappyHorse" watermark in the lower-right corner of the output
`parameters.seed`	No	integer	random	0–2147483647	Random seed for reproducibility. Note: same seed does not guarantee identical output (generation is probabilistic)

Note: No ratio field for I2V — the output video's aspect ratio is auto-derived from the input.media[].url image's dimensions.

Example Request

{
  "input": {
    "prompt": "A cat running on the grass",
    "media": [
      { "type": "first_frame", "url": "https://cdn.translate.alibaba.com/r/wanx-demo-1.png" }
    ]
  },
  "parameters": {
    "resolution": "1080P",
    "duration": 15,
    "watermark": false,
    "seed": 42
  }
}

Response

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_SUBSCRIPTION_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'happy-horse-1-0' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-04-07T10:00:00.000Z",
  "updated_at": "2026-04-07T10:02:30.000Z",
  "completed_at": "2026-04-07T10:02:30.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Happy Horse 1.0 API Pricing

Resolution	Duration	Price (USD)
720P	1s	~~$0.14~~$0.098
1080P	1s	~~$0.24~~$0.168

Happy Horse 1.0 API Documentation

https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseR2VRequest

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Reference to Video - Happy Horse 1.0 API

Request Code

POST https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseR2VRequest
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "input": {
    "prompt": "A woman in a red qipao character1",
    "media": [
      { "type": "reference_image", "url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260424/mvzfud/hh-v2v-girl.jpg" }
    ]
  }
}

import requests

url = "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseR2VRequest"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
    "input": {
        "prompt": "A woman in a red qipao character1",
        "media": [
            {"type": "reference_image", "url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260424/mvzfud/hh-v2v-girl.jpg"}
        ]
    }
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseR2VRequest';
const headers = {
  'Content-Type': 'application/json',
  'Cache-Control': 'no-cache',
  'Ocp-Apim-Subscription-Key': 'YOUR_SUBSCRIPTION_KEY'
};
const data = {
  input: {
    prompt: 'A woman in a red qipao character1',
    media: [
      { type: 'reference_image', url: 'https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260424/mvzfud/hh-v2v-girl.jpg' }
    ]
  }
};

fetch(url, {
  method: 'POST',
  headers: headers,
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -v -X POST "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseR2VRequest" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "input": {
      "prompt": "A woman in a red qipao character1",
      "media": [
        { "type": "reference_image", "url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260424/mvzfud/hh-v2v-girl.jpg" }
      ]
    }
  }'

Output

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Add the X-Webhook-URL header to your submit request to receive a POST callback when the job completes — no polling required.

Webhook Headers

Header	Required	Default	Description
`X-Webhook-URL`	Yes (to enable)	—	HTTPS endpoint on your server that will receive the `POST` callback. Must respond `2xx` within a few seconds (process async if needed).
`X-Webhook-Mode`	No	`terminal`	`terminal` — fires once at the final status (`COMPLETED`/`FAILED`/`ERROR`). `sync` — fires on every poll cycle plus the terminal event, and caps the queue’s polling delay at 15s for tighter progress updates.

Example: enable webhook

X-Webhook-URL: https://your-server.com/webhook/callback
X-Webhook-Mode: terminal

Callback Payload

Your endpoint receives a POST application/json with the same shape as the GET /v2/requests/status/{request_id} response. Example terminal callback (mode terminal):

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-05-22T13:17:32.110Z",
  "updated_at": "2026-05-22 13:19:23",
  "completed_at": "2026-05-22 13:19:23"
}

Failure callback shape

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null,
  "created_at": "...",
  "updated_at": "...",
  "completed_at": "..."
}

Delivery semantics

terminal mode (default) — exactly one POST when the request reaches a terminal status. No callback during PROCESSING.
sync mode — POST on every status poll (with delay capped at ~15s) plus a final POST at terminal status. Use when you want progress updates.
Idempotency — use request_id as your idempotency key. Network retries can deliver the same callback more than once; your handler must tolerate duplicates.
Response — respond 200 OK within a few seconds. The queue does not block on slow handlers, but persistent failures may stop further deliveries.
HTTPS required — plain http:// URLs are rejected.

Request Parameters - Reference to Video

Parameter	Required	Type	Default	Allowed values / range	Description
`input`	Yes	object	—	—	Container for prompt + media.
`input.prompt`	Yes	string	—	—	Describe the desired video. Use `character1`, `character2`, … tokens to reference images by their order in `media`. Max 5000 non-Chinese / 2500 Chinese characters (truncated past).
`input.media`	Yes	array	—	—	Reference images. Array order maps to `characterN` tokens in the prompt.
`input.media[].type`	Yes	string	—	—	Only valid value for R2V.
`input.media[].url`	Yes	string	—	—	Publicly reachable image URL. Shortest side ≥ 400 px (720P+ recommended). Max 10 MB.
`parameters`	No	object	`{}`	—	Container for tuning options.
`parameters.resolution`	No	string	`"1080P"`	—	Output video resolution.
`parameters.ratio`	No	string	`"16:9"`	—	Output aspect ratio.
`parameters.duration`	No	integer	5	—	Length of generated video.
`parameters.watermark`	No	boolean	`false`	true, false	Add “Happy Horse” watermark in the lower-right corner.
`parameters.seed`	No	integer	random	—	Reproducibility hint (probabilistic — same seed does not guarantee identical output).

`characterN` mapping

The order of items in input.media defines which characterN token in the prompt they map to. The first reference_image is character1, the second is character2, and so on up to character9. If your prompt mentions character3, you must have at least 3 entries in media.

Example Request

{
  "input": {
    "prompt": "A woman in a red qipao character1. Side medium view outlining the silhouette, then a low-angle shot capturing her gracefully unfolding a folding fan character2, with tassel earrings character3 swaying lightly as she turns her head.",
    "media": [
      { "type": "reference_image", "url": "https://.../hh-v2v-girl.jpg" },
      { "type": "reference_image", "url": "https://.../hh-v2v2-folding-fan.jpg" },
      { "type": "reference_image", "url": "https://.../hh-v2v-earrings.jpg" }
    ]
  },
  "parameters": {
    "resolution": "1080P",
    "ratio": "16:9",
    "duration": 15,
    "watermark": false,
    "seed": 42
  }
}

Response

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_SUBSCRIPTION_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'happy-horse-1-0' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-04-07T10:00:00.000Z",
  "updated_at": "2026-04-07T10:02:30.000Z",
  "completed_at": "2026-04-07T10:02:30.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Happy Horse 1.0 API Pricing

Resolution	Duration	Price (USD)
720P	1s	~~$0.14~~$0.098
1080P	1s	~~$0.24~~$0.168

Happy Horse 1.0 API Documentation

https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseVideoEditRequest

Authentication

All requests require an API key passed via header.

Header	Type	Required	Description
Ocp-Apim-Subscription-Key	string	Yes	Your API subscription key

Video to Video - Happy Horse 1.0 API

Request Code

POST https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseVideoEditRequest
Content-Type: application/json
Cache-Control: no-cache
Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY

{
  "input": {
    "prompt": "Make the video look like a Studio Ghibli scene",
    "media": [
      { "type": "video", "url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260409/dozxak/Wan_Video_Edit_33_1.mp4" }
    ]
  }
}

import requests

url = "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseVideoEditRequest"
headers = {
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Ocp-Apim-Subscription-Key": "YOUR_SUBSCRIPTION_KEY"
}
data = {
    "input": {
        "prompt": "Make the video look like a Studio Ghibli scene",
        "media": [
            {"type": "video", "url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260409/dozxak/Wan_Video_Edit_33_1.mp4"}
        ]
    }
}

response = requests.post(url, json=data, headers=headers)
print(response.json())

const url = 'https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseVideoEditRequest';
const headers = {
  'Content-Type': 'application/json',
  'Cache-Control': 'no-cache',
  'Ocp-Apim-Subscription-Key': 'YOUR_SUBSCRIPTION_KEY'
};
const data = {
  input: {
    prompt: 'Make the video look like a Studio Ghibli scene',
    media: [
      { type: 'video', url: 'https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260409/dozxak/Wan_Video_Edit_33_1.mp4' }
    ]
  }
};

fetch(url, {
  method: 'POST',
  headers: headers,
  body: JSON.stringify(data)
})
.then(response => response.json())
.then(data => console.log(data))
.catch(error => console.error('Error:', error));

curl -v -X POST "https://gateway.pixazo.ai/happy-horse-1-0/v1/generateHappyhorseVideoEditRequest" \
  -H "Content-Type: application/json" \
  -H "Cache-Control: no-cache" \
  -H "Ocp-Apim-Subscription-Key: YOUR_SUBSCRIPTION_KEY" \
  --data-raw '{
    "input": {
      "prompt": "Make the video look like a Studio Ghibli scene",
      "media": [
        { "type": "video", "url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260409/dozxak/Wan_Video_Edit_33_1.mp4" }
      ]
    }
  }'

Output

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Try Now

Webhook (Optional)

Add the X-Webhook-URL header to your submit request to receive a POST callback when the job completes — no polling required.

Webhook Headers

Header	Required	Default	Description
`X-Webhook-URL`	Yes (to enable)	—	HTTPS endpoint on your server that will receive the `POST` callback. Must respond `2xx` within a few seconds (process async if needed).
`X-Webhook-Mode`	No	`terminal`	`terminal` — fires once at the final status (`COMPLETED`/`FAILED`/`ERROR`). `sync` — fires on every poll cycle plus the terminal event, and caps the queue’s polling delay at 15s for tighter progress updates.

Example: enable webhook

X-Webhook-URL: https://your-server.com/webhook/callback
X-Webhook-Mode: terminal

Callback Payload

Your endpoint receives a POST application/json with the same shape as the GET /v2/requests/status/{request_id} response. Example terminal callback (mode terminal):

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-05-22T13:17:32.110Z",
  "updated_at": "2026-05-22 13:19:23",
  "completed_at": "2026-05-22 13:19:23"
}

Failure callback shape

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null,
  "created_at": "...",
  "updated_at": "...",
  "completed_at": "..."
}

Delivery semantics

terminal mode (default) — exactly one POST when the request reaches a terminal status. No callback during PROCESSING.
sync mode — POST on every status poll (with delay capped at ~15s) plus a final POST at terminal status. Use when you want progress updates.
Idempotency — use request_id as your idempotency key. Network retries can deliver the same callback more than once; your handler must tolerate duplicates.
Response — respond 200 OK within a few seconds. The queue does not block on slow handlers, but persistent failures may stop further deliveries.
HTTPS required — plain http:// URLs are rejected.

Request Parameters - Video to Video

Parameter	Required	Type	Default	Allowed values / range	Description
`input`	Yes	object	—	—	Container for prompt + media.
`input.prompt`	Yes	string	—	—	Describe the intended edit (style transfer, object/clothing replacement, etc.). Max 5000 non-Chinese / 2500 Chinese characters (truncated past).
`input.media`	Yes	array	—	—	Source video plus optional reference images.
`input.media[].type`	Yes	string	—	—	Element kind.
`input.media[].url` (video)	Yes	string	—	—	Source video.
`input.media[].url` (reference_image)	Conditional	string	—	—	Reference image.
`parameters`	No	object	`{}`	—	Container for tuning options.
`parameters.resolution`	No	string	`"1080P"`	—	Output video resolution.
`parameters.watermark`	No	boolean	`false`	true, false	Add “Happy Horse” watermark in the lower-right corner.
`parameters.audio_setting`	No	string	`"auto"`	—	`auto` lets the model decide; `origin` keeps the input video's audio track verbatim.
`parameters.seed`	No	integer	random	—	Reproducibility hint (probabilistic — same seed does not guarantee identical output).

Notes specific to video edit

No ratio or duration — both are derived from the input video. If the input is ≤ 15 s, output matches; if > 15 s, only the first 15 s are processed, so output is at most 15 s.
The input video must be publicly reachable (HTTP/HTTPS). DashScope downloads it directly — R2 / S3 / CDN URLs work; localhost / private URLs do not.
For reference-image-based replacements, describe in the prompt what to put where (e.g. “wear the sweater from image 1”). Array order maps to the order images appear in media.
The SUCCEEDED response populates usage.input_video_duration (source length actually processed) and usage.output_video_duration separately — unlike T2V/I2V/R2V, where input_video_duration is always 0.

Example Request

{
  "input": {
    "prompt": "Make the horse-headed humanoid character in the video wear the striped sweater from image 1, place the prop from image 2 on the table behind, change the wall art to image 3, swap the floor texture to match image 4, and recolor the curtains to match image 5",
    "media": [
      { "type": "video",           "url": "https://.../source.mp4" },
      { "type": "reference_image", "url": "https://.../sweater.webp" },
      { "type": "reference_image", "url": "https://.../prop.jpg" },
      { "type": "reference_image", "url": "https://.../wall-art.png" },
      { "type": "reference_image", "url": "https://.../floor.jpg" },
      { "type": "reference_image", "url": "https://.../curtains.webp" }
    ]
  },
  "parameters": {
    "resolution": "1080P",
    "watermark": false,
    "audio_setting": "origin",
    "seed": 42
  }
}

Response

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "QUEUED",
  "polling_url": "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
}

Request Headers

Header	Value
Content-Type	application/json
Cache-Control	no-cache
Ocp-Apim-Subscription-Key	YOUR_SUBSCRIPTION_KEY

Response Handling

Common status codes.

Code	Meaning
202	Accepted — Request queued
400	Bad Request
401	Unauthorized
402	Insufficient Balance
403	Forbidden
429	Too Many Requests
500	Internal Server Error

Error Responses

Queue system errors and model validation errors.

Queue System Errors

// 402 — Insufficient balance
{
  "error": "Insufficient Balance",
  "message": "Your wallet does not have enough balance."
}

// 400 — Model not found
{
  "error": "Model not found",
  "message": "Model 'happy-horse-1-0' not found or is disabled"
}

Error via Status/Webhook

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "ERROR",
  "model_id": "happy-horse-1-0",
  "error": "Description of the error",
  "output": null
}

Retrieving Results

Poll the universal status endpoint to check progress and retrieve results.

Endpoint

GET https://gateway.pixazo.ai/v2/requests/status/{request_id}
Ocp-Apim-Subscription-Key: YOUR_API_KEY

cURL Example

curl -H "Ocp-Apim-Subscription-Key: YOUR_API_KEY" \
  "https://gateway.pixazo.ai/v2/requests/status/happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Response (Completed)

{
  "request_id": "happy-horse-1-0_019dxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "status": "COMPLETED",
  "model_id": "happy-horse-1-0",
  "error": null,
  "output": {
    "media_url": [
      "https://pub-582b7213209642b9b995c96c95a30381.r2.dev/v1/happy-horse-1-0_019dxxxx-xxxx/output.mp4"
    ],
    "media_type": "video/mp4"
  },
  "created_at": "2026-04-07T10:00:00.000Z",
  "updated_at": "2026-04-07T10:02:30.000Z",
  "completed_at": "2026-04-07T10:02:30.000Z"
}

Response Fields

Field	Type	Description
request_id	string	Unique request identifier
status	string	QUEUED, PROCESSING, COMPLETED, FAILED, or ERROR
model_id	string	Model that processed the request
error	string\|null	Error message if failed
output.media_url	array	URLs to generated media (R2 CDN)
output.media_type	string	MIME type of the output
created_at	string	When request was created
completed_at	string\|null	When request completed
polling_url	string	Status URL (initial response only)

Status Values

Status	Description
QUEUED	Request accepted, waiting to be processed
PROCESSING	Being processed by the model
COMPLETED	Done — output contains the result
FAILED	Failed — check error field
ERROR	System error — not charged

Status Flow

QUEUED → PROCESSING → COMPLETED
                    → FAILED
                    → ERROR

Typical Workflow

Send a generate request to the API endpoint
Save the request_id from the response
Poll every 5-10 seconds: GET /v2/requests/status/{request_id}
When status is "COMPLETED", download from output.media_url

Tip: Use X-Webhook-URL header to get a callback instead of polling.

Happy Horse 1.0 API Pricing

Resolution	Duration	Price (USD)
720P	1s	~~$0.14~~$0.098
1080P	1s	~~$0.24~~$0.168

Happy Horse 1.0 API - T2V, I2V, R2V, Video Edit API: Pricing, Documentation

Models Version

Get $5 Free Credit on First Payment

Happy Horse 1.0 API Documentation

Authentication

Text to Video - Happy Horse API

Request Code

Output

Webhook (Optional)

Webhook Headers

Example: enable webhook

Callback Payload

Failure callback shape

Delivery semantics

Request Parameters - Text to Video

Example Request

Response

Request Headers

Response Handling

Error Responses

Queue System Errors

Error via Status/Webhook

Retrieving Results

Endpoint

cURL Example

Response (Completed)

Response Fields

Status Values

Status Flow

Typical Workflow

Happy Horse 1.0 API Pricing

Happy Horse 1.0 API Documentation

Authentication

Image to Video - Happy Horse API

Request Code

Output

Webhook (Optional)

Webhook Headers

Example: enable webhook

Callback Payload

Failure callback shape

Delivery semantics

Request Parameters - Image to Video

Example Request

Response

Request Headers

Response Handling

Error Responses

Queue System Errors

Error via Status/Webhook

Retrieving Results

Endpoint

cURL Example

Response (Completed)

Response Fields

Status Values

Status Flow

Typical Workflow

Happy Horse 1.0 API Pricing

Happy Horse 1.0 API Documentation

Authentication

Reference to Video - Happy Horse 1.0 API

Request Code

Output

Webhook (Optional)

Webhook Headers

Example: enable webhook

Callback Payload

Failure callback shape

Delivery semantics

Request Parameters - Reference to Video

characterN mapping

Example Request

Response

Request Headers

Response Handling

Error Responses

Queue System Errors

Error via Status/Webhook

Retrieving Results

`characterN` mapping