Metered Messages

Last 30 days

Uptime

100%

Response time

190 ms typical, 190 ms slowest 5%

Last check

11 min ago

Next check

in 20 min

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://agent402.tools/v1/metered/messages" \
  -H "content-type: application/json" \
  -d '{"max_tokens":256,"messages":[{"content":"Summarize x402 in one sentence.","role":"user"}],"model":"anthropic/claude-haiku-4.5"}'

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

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fv1%2Fmetered%2Fmessages
const res = await pay("https://agent402.tools/v1/metered/messages", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"max_tokens":256,"messages":[{"content":"Summarize x402 in one sentence.","role":"user"}],"model":"anthropic/claude-haiku-4.5"}),
});
console.log(await res.json());

Example input

{
  "max_tokens": 256,
  "messages": [
    {
      "content": "Summarize x402 in one sentence.",
      "role": "user"
    }
  ],
  "model": "anthropic/claude-haiku-4.5"
}

Example output

{
  "content": [
    {
      "text": "x402 is an HTTP-native way for agents to pay per request with USDC.",
      "type": "text"
    }
  ],
  "id": "msg_…",
  "model": "anthropic/claude-sonnet-5",
  "role": "assistant",
  "stop_reason": "end_turn",
  "type": "message",
  "usage": {
    "input_tokens": 14,
    "output_tokens": 18
  }
}

Security scan

• No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

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