Judge images (preview)

Ask typed questions about up to 4 images (PNG or JPEG) and get answers your code can branch on: noul (yes/no probability), choice, score, and box (where something is, as edges from 0 to 1). Send POST /v1/judge/vision with the required fields images and questions and pay $0.003 per call over x402 or MPP (there is no free tier). It returns the result.

Name each image, then refer to it as `name` in a question. Preview: built on Jev features its maker labels experimental. Answers come from a model, not deterministic code.

Try in playground →

Parameters

Example request

curl -i -X POST https://agent402.tools/v1/judge/vision \
  -H "Content-Type: application/json" \
  -d '{"images":{"picture":{"format":"png","data_base64":"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"}},"questions":{"has_red":{"type":"noul","instructions":"Does `picture` contain a red shape?"}}}'

Without payment this returns HTTP 402 Payment Required with the exact price for judge-vision; any x402 v2 or MPP client pays it and retries.

Example response

{}

From an MCP client

catalog.call {
  "slug": "judge-vision",
  "params": {
    "images": {
      "picture": {
        "format": "png",
        "data_base64": "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"
      }
    },
    "questions": {
      "has_red": {
        "type": "noul",
        "instructions": "Does `picture` contain a red shape?"
      }
    }
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for judge-vision; the stdio package pays it from a wallet or from an AGENT402_CREDITS_KEY issued earlier. Local install: npx -y agent402-mcp.

Errors and behavior

• images and questions are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool runs a model, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• Model-backed: the answer is generated by a model, so the same input can produce a different result.
• A GET or HEAD to /v1/judge/vision returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB and a streamed response are not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.({ maxAmountPerPayment: "$0.003" }); // refuse any quote above this tool's price
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/v1/judge/vision", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "images": {
      "picture": {
        "format": "png",
        "data_base64": "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"
      }
    },
    "questions": {
      "has_red": {
        "type": "noul",
        "instructions": "Does `picture` contain a red shape?"
      }
    }
  }),
});

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