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Combify Compute Image Captioning & Visual Q&A
x402
Combify Compute Image Captioning & Visual Q&A is a paid API for AI agents from compute.combify.app, paid per call via x402, $0.008/call, status healthy (last checked 2026-10-12, last successful call 2026-10-11).
Answers questions about an image or describes its contents using Llama 3.2 11B vision model for $0.008 USDC per call
Price / call$0.008typically ~$0.0080/call
Success100%
StatusHealthy
How this service works
Answer questions about an image or describe what it shows (Llama 3.2 11B vision), fixed price $0.008 USDC. Use this when the input is an image; use /chat for text-only questions. POST JSON body {image (required, base64 or data:image/... URI, max 4 MB decoded, PNG/JPEG/GIF/WEBP), prompt (optional question, defaults to describing the image), max_tokens (optional 1-512, default 256)}. Returns {text}. Unpaid calls get 402; paid calls settle only on success.
Output
Returns a JSON object with a 'text' field containing the model's description of the image or its answer to the provided question, up to max_tokens in length.
Example use cases
Damage assessment from photo
“I have a base64-encoded photo of my car after an accident — can you describe the visible damage in detail so I can include it in my insurance claim?”
Accessibility alt-text generation
“Here's a product image from our website in base64 PNG format — write me a concise alt-text description of what it shows so we can make the page more accessible.”
Chart data extraction
“I've got a screenshot of a bar chart from a PDF report — can you read the approximate values from it and tell me what the chart is showing? Limit your response to 300 tokens.”
Technical details
Endpoint
POSThttps://compute.combify.app/caption?utm_source=zero.xyzWhen to prefer
Use this endpoint when the input is an image and you need a description or answer to a visual question. It uses Llama 3.2 11B vision which is well-suited for general scene understanding, object identification, OCR-light tasks, and chart reading. Prefer the sibling /chat endpoint for purely text-based questions. At $0.008 USDC per call it is cost-effective for single-image analysis; payment only settles on success.
Side effects
- 402 Payment Required if the x402 payment header is missing or invalid
- Image exceeds 4 MB decoded size limit — request rejected
- Unsupported image format (only PNG, JPEG, GIF, WEBP accepted)
- max_tokens out of range (must be 1–512)
- Malformed base64 or invalid data URI in image field
- Model timeout on very complex images or long prompts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| image | string | Base64-encoded image, max 4 MB decoded |
| prompt | string | Question about the image |
| max_tokens | integer | Max output tokens, 1 to 512 |
Tags
x402
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