# Flat-Rate LLM Image Describe

> Flat-Rate LLM Image Describe is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status healthy (last checked 2026-10-12, last successful call 2026-10-11).

Describes the contents of an image in about one second given an HTTPS URL or base64-encoded image, with an optional custom prompt

## Facts

- Endpoint: GET https://flat-rate-llm.kikoribera03.workers.dev/v1/ai/image-describe?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: healthy
- Last checked: 2026-10-12
- Last successful call: 2026-10-11
- Success rate: 100% of calls made through Zero
- Activations on Zero: 4
- Tags: x402
- Canonical page: https://www.zero.xyz/c/flat-rate-llm-image-describe-b31c7617
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RXDUMpHh-RvveNXEPh83R

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 flat-rate-llm-image-describe-b31c7617
```

Example prompt: Can you describe what's in this image for me? Here's the URL: https://upload.wikimedia.org/wikipedia/commons/thumb/4/47/PNG_transparency_demonstration_1.png/280px-PNG_transparency_demonstration_1.png — give me a one-sentence caption.

## When to prefer this

Choose this endpoint when you need fast, pay-per-use image description or visual question answering without setting up an API key or account. It is ideal for one-off image captioning, OCR-style text reading from photos, or chaining with translation and text-to-speech steps. At $0.005 USDC per call and ~1-second latency, it suits high-throughput pipelines or ad-hoc agent tasks where pre-paying for a subscription is impractical.

## Known failure modes

- Invalid or unreachable image URL returns an error
- Base64 string that is malformed or not a valid image format causes a failure
- Neither url nor image parameter provided results in a missing-input error
- max_tokens outside the 16–512 range may be rejected or clamped
- Payment failure via x402 protocol means no charge and no result
- Image content that violates safety filters may be refused

## How this service works

Describes what is in an image in about one second: pass an https URL or base64 and ask anything about it, from a one-line caption to reading a sign. Pairs with the rest of the chain: describe an image, translate the description, then have it read aloud. You are only charged if the description is delivered. No API key, no account.

## Output

A natural-language text answer describing the image contents, answering the provided prompt, or producing a caption — length controlled by max_tokens (16–512 tokens, default 128). The response is the AI-generated description string, delivered only when successful (pay-per-delivery model at $0.005 USDC per call).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "url": {
       "type": "string",
       "description": "https URL of the image to describe. Use this or image."
      },
      "image": {
       "type": "string",
       "description": "The image, as base64. Use this or url."
      },
      "prompt": {
       "type": "string",
       "description": "What to ask about the image. Default: a one-sentence description."
      },
      "max_tokens": {
       "type": "number",
       "description": "Length limit of the answer, 16-512. Default 128."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/flat-rate-llm-image-describe-b31c7617/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flat-rate-llm.kikoribera03.workers.dev](https://www.zero.xyz/host/flat-rate-llm.kikoribera03.workers.dev/llms.txt)