API Features

API Features

Our decentralized network delivers affordable, on-demand AI inference compute through simple OpenAI-compatible HTTP APIs.

[NOTE] The keys shown in examples are dummy placeholders (wsk-examplekey). To obtain production keys use https://app.w.ai/developers/keys

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Base API URL

https://api.w.ai/v1

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Authorization

Include your API key in the Authorization header:

Authorization: Bearer wsk-examplekey

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List Available Models

Retrieve metadata for all available models on the network.

curl -X GET 'https://api.w.ai/v1/models'

Response includes:

• Model ID, name, and description

• Input/output modalities (text, image, video)

• Context length (for LLMs)

• Quantization level (4bit, 8bit, fp16)

• Supported sampling parameters

---

Text Chat Completions

Create text-based chat completions using LLM models like Llama, Mistral, Gemma, DeepSeek, and more.

Endpoint

POST /v1/chat/completions

Basic Example

curl -X POST 'https://api.w.ai/v1/chat/completions' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "llama-3.2-1b-4bit",
    "messages": [
      { "role": "user", "content": "Hello! Who is davinci?" }
    ],
    "max_tokens": 150,
    "stream": false
  }'

Request Parameters

Parameter	Type	Required	Description
model	string	✅	Model ID (e.g., llama-3.2-1b-4bit)
messages	array	✅	Array of message objects
max_tokens	integer		Maximum tokens to generate (min: 1)
temperature	number		Sampling temperature (0-2, default: 1.0)
top_p	number		Nucleus sampling (0-1)
frequency_penalty	number		Frequency penalty (-2 to 2)
presence_penalty	number		Presence penalty (-2 to 2)
stream	boolean		Enable streaming responses
response_format	object		Output format (e.g., {"type": "json_object"})
tools	array		Function definitions for tool calling
tool_choice	string/object		Tool selection mode (none, auto, required, or specific function)

Message Roles

• system — System instructions

• user — User messages

• assistant — Assistant responses

• tool — Tool/function call results

---

Vision-Language Chat (VLM)

Send images along with text prompts for multimodal understanding.

Example with Image URL

curl -X POST 'https://api.w.ai/v1/chat/completions' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "gemma-3-27b-4bit",
    "messages": [
      {
        "role": "user",
        "content": [
          { "type": "image_url", "image_url": { "url": "http://images.cocodataset.org/val2017/000000039769.jpg" } },
          { "type": "text", "text": "Describe the contents of this image." }
        ]
      }
    ],
    "max_tokens": 150,
    "stream": false
  }'

Image Content Object

Field	Type	Description
type	string	Must be image_url
image_url.url	string	URL or base64-encoded image
image_url.detail	string	Resolution: low, high, or auto (optional)

---

Tool Calling (Function Calling)

Enable models to call external functions/tools.

Example with Tools

curl -X POST 'https://api.w.ai/v1/chat/completions' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "llama-3.3-70b-4bit",
    "messages": [
      { "role": "user", "content": "What is the weather like in San Francisco?" }
    ],
    "tools": [
      {
        "type": "function",
        "function": {
          "name": "get_weather",
          "description": "Get current weather for a location",
          "parameters": {
            "type": "object",
            "properties": {
              "location": { "type": "string", "description": "City name" },
              "unit": { "type": "string", "enum": ["celsius", "fahrenheit"] }
            },
            "required": ["location"]
          }
        }
      }
    ],
    "tool_choice": "auto"
  }'

Tool Choice Options

Value	Description
none	Disable tool calling
auto	Model decides when to call tools
required	Force the model to call a tool
{"type": "function", "function": {"name": "..."}}	Call a specific function

Handling Tool Call Responses

When the model calls a tool, respond with the result:

{
  "model": "llama-3.3-70b-4bit",
  "messages": [
    { "role": "user", "content": "What is the weather like in San Francisco?" },
    {
      "role": "assistant",
      "content": null,
      "tool_calls": [
        {
          "id": "call_abc123",
          "type": "function",
          "function": { "name": "get_weather", "arguments": "{\"location\": \"San Francisco\"}" }
        }
      ]
    },
    {
      "role": "tool",
      "tool_call_id": "call_abc123",
      "content": "{\"temperature\": 68, \"condition\": \"sunny\"}"
    }
  ]
}

---

Image Generation

Generate images from text prompts using models like FLUX and SDXL.

Endpoint

POST /v1/images/generations

Example

curl -X POST 'https://api.w.ai/v1/images/generations' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "flux-1-dev",
    "prompt": "A green photorealistic hand in the matrix holding a sign that says W.ai, everything should be binary 1s and 0s",
    "size": "1024x1024"
  }'

Request Parameters

Parameter	Type	Required	Default	Description
model	string	✅		Model ID (e.g., flux-1-dev, sdxl)
prompt	string	✅		Text description of the image
size	string		1024x1024	Output dimensions (e.g., 512x512, 1024x1024)
quality	string			Quality level: low, medium, high, hd
seed	integer		Random	Seed for reproducible generation
steps	integer		Model default	Denoising steps (1-100)
guidance_scale	number		Model default	Prompt adherence (1-20)
negative_prompt	string			What to exclude from the image
stream	boolean		false	Enable streaming for progress updates

---

Image Editing

Edit existing images using text prompts with FLUX Kontext models.

Endpoint

POST /v1/images/edits

Example

curl -X POST 'https://api.w.ai/v1/images/edits' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --header 'Content-Type: multipart/form-data' \
  --form 'model=flux-1-kontext-dev' \
  --form 'prompt=Convert to pencil sketch with natural graphite lines, cross-hatching, and visible paper texture' \
  --form 'image=@/path/to/your/image.jpg' \
  --form 'guidance_scale=2.5'

Request Parameters (multipart/form-data)

Parameter	Type	Required	Default	Description
model	string	✅		Model ID (e.g., flux-1-kontext-dev)
prompt	string	✅		Edit instructions
image	file	✅		Source image file(s). Multiple images supported.
size	string		1024x1024	Output dimensions
negative_prompt	string			What to avoid in the edit
seed	integer		Random	Seed for reproducible results
steps	integer		Model default	Denoising steps
guidance_scale	number			Prompt adherence strength
quality	string			Quality level
stream	boolean		false	Enable streaming

---

Object Detection & Segmentation

Run object detection (YOLO11n) or image/video segmentation (SAM2) on images and videos.

Endpoint

POST /v1/predictions

YOLO11n Object Detection Example

Detect objects in an image with bounding boxes and class labels:

curl -X POST 'https://api.w.ai/v1/predictions' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "yolo11n",
    "input": {
      "image": "https://images.cocodataset.org/val2017/000000039769.jpg",
      "conf": 0.25,
      "iou": 0.45,
      "imgsz": 640,
      "return_json": true
    }
  }'

SAM2 Segmentation Example

Segment objects using point prompts:

curl -X POST 'https://api.w.ai/v1/predictions' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "sam2",
    "input": {
      "image": "https://images.cocodataset.org/val2017/000000039769.jpg",
      "points": [
        { "x": 500, "y": 375, "label": 1 }
      ],
      "mask_type": "highlighted",
      "return_json": false
    }
  }'

SAM2 Video Segmentation Example

Track and segment objects across video frames:

curl -X POST 'https://api.w.ai/v1/predictions' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "sam2",
    "input": {
      "video": "https://example.com/video.mp4",
      "points": [
        { "x": 200, "y": 150, "label": 1 }
      ],
      "video_fps": 25,
      "output_frame_interval": 1,
      "annotation_type": "mask"
    }
  }'

Request Parameters

Parameter	Type	Required	Default	Description
model	string	✅		Model ID (yolo11n or sam2)
input.image	string	✅*		Image URL or base64. *Either image or video required.
input.video	string	✅*		Video URL or base64. *Either image or video required.

YOLO11n Parameters:

Parameter	Type	Default	Description
input.conf	number	0.25	Confidence threshold (0-1)
input.iou	number	0.45	IOU threshold for NMS (0-1)
input.imgsz	integer	640	Input image size (320-1280)
input.return_json	boolean	true	Return JSON detections or annotated image

SAM2 Parameters:

Parameter	Type	Default	Description
input.points	array		Point prompts: [{x, y, label}] where label 1=foreground, 0=background
input.boxes	array		Box prompts: [{x1, y1, x2, y2}]
input.mask_type	string	highlighted	Mask visualization style
input.annotation_type	string	mask	Output type: mask, contour, etc.
input.points_per_side	integer	32	Auto-mask grid density (8-128)
input.pred_iou_thresh	number	0.88	Predicted IOU threshold (0-1)
input.stability_score_thresh	number	0.95	Mask stability threshold (0-1)
input.use_m2m	boolean	true	Enable mask-to-mask refinement
input.multiview	boolean	false	Multi-view consistency

Video-specific Parameters:

Parameter	Type	Default	Description
input.video_fps	integer	25	Output video frame rate (1-60)
input.output_frame_interval	integer	1	Process every Nth frame (1-10)
input.output_format	string	webp	Output format for frames
input.output_quality	integer	80	Output quality (1-100)

---

Video Generation (Audio)

Generate audio for video clips using video-to-audio models.

Endpoint

POST /v1/videos/generations

Example

curl -X POST 'https://api.w.ai/v1/videos/generations' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --header 'Content-Type: multipart/form-data' \
  --form 'model=mmaudio' \
  --form 'video=@/path/to/video.mp4' \
  --form 'prompt=upbeat background music with gentle piano'

Request Parameters (multipart/form-data)

Parameter	Type	Required	Description
model	string	✅	Model ID
video	file	✅	Source video file
prompt	string		Audio description
negative_prompt	string		What to avoid
seed	integer		Seed for reproducibility
duration	number		Target duration
num_steps	integer		Generation steps
cfg_strength	number		Guidance strength
stream	boolean		Enable streaming

---

Responses API (Items-Based)

Alternative API format based on the Open Responses specification with structured Items.

Endpoint

POST /v1/responses

Example

curl -X POST 'https://api.w.ai/v1/responses' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "llama-3.2-1b-4bit",
    "input": [
      {
        "type": "message",
        "role": "user",
        "content": "Explain quantum computing in simple terms."
      }
    ],
    "max_output_tokens": 500
  }'

Request Parameters

Parameter	Type	Required	Description
model	string	✅	Model ID
input	array	✅	Array of Item objects
instructions	string		System-level instructions
tools	array		Function tool definitions
tool_choice	string/object		Tool selection mode
stream	boolean		Enable streaming
temperature	number		Sampling temperature (0-2)
max_output_tokens	integer		Maximum output tokens
top_p	number		Nucleus sampling (0-1)
frequency_penalty	number		Frequency penalty (-2 to 2)
presence_penalty	number		Presence penalty (-2 to 2)
parallel_tool_calls	boolean		Allow parallel tool execution
text.format.type	string		Output format: text, json_object, json_schema

Item Types

• User Message: { "type": "message", "role": "user", "content": "..." }

• System Message: { "type": "message", "role": "system", "content": "..." }

• Developer Message: { "type": "message", "role": "developer", "content": "..." }

• Assistant Message: { "type": "message", "role": "assistant", "content": "..." }

• Function Call: { "type": "function_call", "call_id": "...", "name": "...", "arguments": "..." }

• Function Output: { "type": "function_call_output", "call_id": "...", "output": "..." }

Content Types

For multimodal inputs, use content arrays:

{
  "type": "message",
  "role": "user",
  "content": [
    { "type": "input_text", "text": "What's in this image?" },
    { "type": "input_image", "image_url": "https://example.com/image.jpg" },
    { "type": "input_file", "file_data": "base64...", "filename": "doc.pdf" }
  ]
}

Structured Output (JSON Schema)

{
  "model": "llama-3.3-70b-4bit",
  "input": [{ "type": "message", "role": "user", "content": "List 3 colors" }],
  "text": {
    "format": {
      "type": "json_schema",
      "json_schema": {
        "name": "color_list",
        "schema": {
          "type": "object",
          "properties": {
            "colors": { "type": "array", "items": { "type": "string" } }
          }
        },
        "strict": true
      }
    }
  }
}

---

Streaming Responses

Enable real-time streaming by setting stream: true. Responses are sent as Server-Sent Events (SSE).

Example

curl -X POST 'https://api.w.ai/v1/chat/completions' \
  --header 'Content-Type: application/json' \
  --header 'Authorization: Bearer wsk-examplekey' \
  --data '{
    "model": "llama-3.2-1b-4bit",
    "messages": [{ "role": "user", "content": "Write a haiku about AI" }],
    "stream": true
  }'

Response Format

data: {"id":"...","object":"chat.completion.chunk","choices":[{"delta":{"content":"token"},"index":0}]}

data: [DONE]

---

Error Handling

API errors follow the OpenAI error format:

{
  "error": {
    "message": "Error description",
    "type": "error_type",
    "code": "error_code"
  }
}

Common Error Codes

Code	Description
401	Invalid or missing API key
400	Invalid request parameters
429	Rate limit exceeded
503	Service temporarily unavailable

---

Rate Limits

Rate limits vary by endpoint and account tier. Contact [e-mail] for higher limits.

---

SDK Compatibility

The W.ai API is OpenAI SDK compatible. Use your preferred OpenAI client library:

Python

from openai import OpenAI

client = OpenAI(
    base_url="https://api.w.ai/v1",
    api_key="wsk-examplekey"
)

response = client.chat.completions.create(
    model="llama-3.2-1b-4bit",
    messages=[{"role": "user", "content": "Hello!"}]
)

JavaScript/TypeScript

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://api.w.ai/v1',
  apiKey: 'wsk-examplekey'
});

const response = await client.chat.completions.create({
  model: 'llama-3.2-1b-4bit',
  messages: [{ role: 'user', content: 'Hello!' }]
});