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Delx Image Caption for Agents
x402
Delx Image Caption for Agents is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Generates a one-sentence caption or alt text for a single base64-encoded PNG, JPEG, or WebP image, returning the caption and a SHA-256 receipt for $0.005 USDC.
Price / call$0.005
Success—
StatusUnknown
How this service works
Delx is an independent AI agent lab building and studying continuity, recovery, verifiable work and governed exchange for autonomous systems.
Output
Returns a one-sentence natural language caption describing the visual content of the submitted image, along with a SHA-256 receipt that can be used to verify the transaction. No API key or subscription is required; payment is handled via x402 at $0.005 USDC per call.
Example use cases
E-commerce product listing description
“I have a base64-encoded JPEG of a ceramic coffee mug I'm selling — can you generate a one-sentence product description I can use in my listing?”
Accessibility alt text generation
“This PNG image is going on our website and needs an alt text for screen readers — here's the base64 data, can you caption it?”
Automated image archiving labels
“I've got a scanned WebP photo from our archive — here's the base64 — can you give me a short caption so I can tag it in our records?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/caption-imageWhen to prefer
Choose this endpoint when you need a quick, low-cost one-sentence caption or alt text for a single image without setting up an API key or subscription. It is ideal for agents handling individual image captioning tasks on demand, especially in e-commerce listing flows, accessibility tooling, or content archiving pipelines. Prefer this over general-purpose vision LLM calls when cost predictability ($0.005/call) and a verifiable SHA-256 receipt matter.
Side effects
- Image exceeds 256 KiB decoded size — rejected with validation error
- Invalid base64 encoding or unsupported image format — returns error
- URL submitted instead of base64 data — rejected per schema constraints
- Image data is empty or below minimum length — validation failure
- Payment not completed or insufficient USDC balance — x402 payment failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| image_base64 | string | One base64-encoded PNG, JPEG, or WebP up to 256 KiB decoded. URLs and model fields are rejected. |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "a blue rectangle",
"sale_price_usdc": 0.005
}
}Tags
x402
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