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Delx Commerce Image Captioning API
x402
Delx Commerce Image Captioning API is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Generates a plain-text caption describing the visual content of a base64-encoded image, paid per-result via USDC
Price / call$0.005
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
A JSON object containing a 'text' field with a natural language caption describing the image contents, and a 'sale_price_usdc' field confirming the per-call charge (e.g. 0.005 USDC).
Example use cases
Auto alt-text for product images
“I have a base64-encoded PNG of one of our product shots — can you generate a caption describing what's in it so I can use it as alt text on the website?”
Screenshot content extraction
“Here's a base64-encoded screenshot from our app — describe what's visible in it so I can log it in our bug report.”
Image inventory labeling
“I've got a base64-encoded JPEG of an item in our warehouse — what does the image show? I need a short description to tag it in our inventory system.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/caption-image?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, low-cost, no-signup image captioning call paid per result with on-chain verifiability via USDC. Ideal for AI agents operating autonomously without pre-negotiated API keys, or when you need pay-as-you-go billing with cryptographic payment proof. Best suited for single-image captioning of PNG, JPEG, or WebP files under 256 KiB.
Side effects
- Image exceeds 256 KiB decoded size — request rejected
- Invalid base64 encoding — returns error
- Unsupported image format (not PNG, JPEG, or WebP) — request rejected
- URL passed instead of base64 data — explicitly rejected by schema
- Model field included — rejected
- Payment not provided or insufficient USDC — 402 Payment Required response
- Network timeout if image is at size limit
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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