# ForgeMesh Image Caption API

> ForgeMesh Image Caption API is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Generates a natural-language caption for any public image URL using a locally-hosted vision engine, with no data retained.

## Facts

- Endpoint: POST https://x402.forgemesh.io/image-caption
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/forgemesh-image-caption-api-79557a5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VG3rjZyxHiowGGvOlAr0t

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability forgemesh-image-caption-api-79557a5d -d '<json body>'
```

Example prompt: Can you give me a natural-language caption for this image: https://example.com/photos/storefront.jpg? I need a concise description I can use for cataloging.

## When to prefer this

Choose this endpoint when you need a quick, privacy-friendly, single-call natural-language description of any public image URL — especially for cataloging pipelines, moderation triage, or dataset labeling where no data retention is a requirement. Prefer it over cloud vision APIs when privacy or data residency matters, since the model runs locally and retains nothing.

## Known failure modes

- Image URL is not publicly accessible or returns a non-200 response — request fails with an error
- Image exceeds 8MB size limit — rejected with a payload-too-large error
- Unsupported image format (not jpg/png/webp) — returns format error
- Network timeout fetching the remote image — returns a timeout error
- Malformed or invalid URL provided — returns a validation error

## How this service works

Image captioning API: one-call natural-language caption for any image URL, generated by our locally-hosted vision engine. Ideal for cataloging, moderation triage, and dataset labeling. No data retained.

## Output

A natural-language text caption describing the content of the provided image, generated by a locally-hosted vision model. No image data is retained after the call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "image_url": {
   "type": "string",
   "description": "Public URL of the image (jpg/png/webp, max 8MB)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "A teal rectangular graphic with the words FORGEMESH UTILITY GRID in bold white capital letters centered on it.",
  "model": "moondream"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/forgemesh-image-caption-api-79557a5d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.forgemesh.io](https://www.zero.xyz/host/x402.forgemesh.io/llms.txt)