# Cloudflare Vision: Describe

Caption an image or answer a question about it using Cloudflare Workers AI (@cf/meta/llama-3.2-11b-vision-instruct). Pass source_url plus an optional prompt (e.g. "Read the text" or "What is in this image?"). The source is downscaled before inference.

- Method: POST
- Path: `/vision/describe`
- Price: $0.00300000

## Input Schema

```json
{
  "type": "object",
  "properties": {
    "source_url": {
      "type": "string",
      "format": "uri",
      "description": "Public URL of the image to describe (max 10 MB)."
    },
    "prompt": {
      "type": "string",
      "minLength": 1,
      "maxLength": 1000,
      "description": "Question or instruction about the image. Defaults to a general description ask."
    },
    "max_tokens": {
      "type": "integer",
      "minimum": 1,
      "maximum": 512,
      "description": "Maximum tokens to generate (1-512). Defaults to 256."
    }
  },
  "required": [
    "source_url"
  ],
  "additionalProperties": false
}
```

## Output Schema

```json
{
  "type": "object",
  "properties": {
    "model": {
      "type": "string",
      "description": "Workers AI model id used"
    },
    "description": {
      "type": "string",
      "description": "The generated description or answer"
    }
  },
  "required": [
    "model",
    "description"
  ],
  "additionalProperties": false,
  "description": "Image-to-text result"
}
```

## Networks

| Name | Mode | CAIP-2 | Chain ID / Cluster | Protocols |
|---|---|---|---|---|
| Tempo Mainnet | live | `eip155:4217` | 4217 | mpp |
| Solana Mainnet | live | `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp` | mainnet-beta | mpp, x402 |
| Base | live | `eip155:8453` | 8453 | x402 |

## Accepted Currencies

| Symbol | Name | Decimals | Network | Address | Protocols |
|---|---|---|---|---|---|
| USDC.e | Bridged USDC (Stargate) | 6 | `eip155:4217` | `0x20c000000000000000000000b9537d11c60e8b50` | mpp |
| USDC | USD Coin (Solana) | 6 | `solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp` | `EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v` | mpp, x402 |
| USDC | USD Coin | 6 | `eip155:8453` | `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` | x402 |

## How to invoke

Payment is handled automatically — the client signs the 402 challenge and retries.

### TypeScript — Tempo (mppx + fetch) ([docs](https://mpp.dev/sdk/typescript/client))

```ts
import { privateKeyToAccount } from 'viem/accounts'
import { Mppx, tempo } from 'mppx/client'

Mppx.create({
  methods: [tempo({ account: privateKeyToAccount('0x...') })],
})

const res = await fetch('https://cloudflare.payweave.services/vision/describe', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "source_url": "https://example.com",
    "prompt": "",
    "max_tokens": 1
  }),
})
const data = await res.json()
```

### TypeScript — Solana (@solana/mpp + fetch) ([docs](https://github.com/solana-foundation/mpp-sdk))

```ts
import { createKeyPairSignerFromBytes } from '@solana/kit'
import { Mppx } from 'mppx/client'
import { solana } from '@solana/mpp/client'

const signer = await createKeyPairSignerFromBytes(/* 64-byte secret key */)
Mppx.create({ methods: [solana({ signer })] })

const res = await fetch('https://cloudflare.payweave.services/vision/describe', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "source_url": "https://example.com",
    "prompt": "",
    "max_tokens": 1
  }),
})
const data = await res.json()
```

### mppx CLI ([docs](https://mpp.dev/sdk/typescript/cli))

```sh
npx mppx "https://cloudflare.payweave.services/vision/describe" -X POST -H 'Content-Type: application/json' -d '{"source_url":"https://example.com","prompt":"","max_tokens":1}'
```

### Tempo Wallet ([docs](https://docs.tempo.xyz/cli/wallet))

```sh
tempo request "https://cloudflare.payweave.services/vision/describe" -X POST --json '{"source_url":"https://example.com","prompt":"","max_tokens":1}'
```

### pay.sh — Solana Foundation ([docs](https://pay.sh))

```sh
pay --mainnet curl "https://cloudflare.payweave.services/vision/describe" -X POST -H 'Content-Type: application/json' -d '{"source_url":"https://example.com","prompt":"","max_tokens":1}'
```

### agentcash CLI ([docs](https://www.npmjs.com/package/agentcash))

```sh
npx agentcash fetch "https://cloudflare.payweave.services/vision/describe" -m POST -b '{"source_url":"https://example.com","prompt":"","max_tokens":1}' -p mpp
```

### x402 — Base / Solana USDC (x402-fetch) ([docs](https://x402.org))

```ts
import { wrapFetchWithPayment } from 'x402-fetch'
import { privateKeyToAccount } from 'viem/accounts'

const account = privateKeyToAccount('0x...') // Base USDC wallet
const fetchWithPay = wrapFetchWithPayment(fetch, account)

const res = await fetchWithPay('https://cloudflare.payweave.services/vision/describe', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    "source_url": "https://example.com",
    "prompt": "",
    "max_tokens": 1
  }),
})
const data = await res.json()
```

### x402 — agentcash CLI

```sh
npx agentcash fetch "https://cloudflare.payweave.services/vision/describe" -m POST -b '{"source_url":"https://example.com","prompt":"","max_tokens":1}' -p x402
```