Route and execute (max tier)

Describe a task (or name a slug) and the Smart Order Router resolves the best-matching tool and RUNS it in the same call - flat $0.55 covering any tool listed at $0.5 or less, from THIS host's catalog or any external seller in the open index - x402 sellers, or MPP sellers on Tempo (Agent402 buys the result over x402 or MPP and sells it to you). Send POST /api/route/execute-max with no required fields (5 optional) and pay $0.55 per call over x402 or MPP (there is no free tier). It returns a JSON object with receipt and result.

One payment, one request, result + receipt. /api/route quotes which tier a task needs; pricier tools return a self-correcting 409 with their direct route.

Try in playground →

Parameters

Example request

curl -i -X POST https://agent402.tools/api/route/execute-max \
  -H "Content-Type: application/json" \
  -d '{"task":"look up the DNS records of a domain","params":{"name":"example.com","type":"A"}}'

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

Example response

{
  "receipt": {
    "slug": "dns",
    "route": "GET /api/dns",
    "underlyingPriceUsd": 0.001,
    "paidUsd": 0.55,
    "routingFeeUsd": 0.009,
    "seller": "internal",
    "resolvedBy": "task",
    "ts": "2026-07-10T00:00:00.000Z",
    "callRef": "sha256:…  (recomputable: sha256 of {\"nonce\":<payment authorization nonce>,\"slug\":…,\"ts\":…} - null on nonce-less calls)"
  },
  "result": {
    "name": "example.com",
    "type": "A",
    "records": [
      "…"
    ]
  }
}

From an MCP client

catalog.call {
  "slug": "route-execute-max",
  "params": {
    "task": "look up the DNS records of a domain",
    "params": {
      "name": "example.com",
      "type": "A"
    }
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for route-execute-max; 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

• Every field is optional. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example.
• 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 canceled 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 reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A judgment model picks among the shortlisted tools; the chosen tool runs unchanged, so the answer itself is the tool's own.
• A GET or HEAD to /api/route/execute-max 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 is 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: "$0.55" }); // 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/api/route/execute-max", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "task": "look up the DNS records of a domain",
    "params": {
      "name": "example.com",
      "type": "A"
    }
  }),
});

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