Decide: execute a plan

Run a decision's plan through Agent402: first-party steps run directly, third-party steps are paid on your behalf (paid on Base, or by credits or card) and relayed at the seller's price plus a disclosed routing fee. Send POST /api/decide/execute with the required field decisionId and pay quoted per request from $0.001 over x402 with USDC on an EVM chain. It returns a JSON object with runId, decisionId, status, steps, budgetUsd and 5 more.

Priced at the plan's budget (or your maxBudgetUsd, whichever you set) less a valid execution credit; spend stops at that budget, fallbacks are tried in order, and any unspent amount comes back as a credit. A run where no step succeeds is not charged.

Category: agents · Tags: agents execute planning router x402

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/decide/execute \
  -H "Content-Type: application/json" \
  -d '{"decisionId":"dec_2b1c9e0f4a7d4c3e9b8a1f00","creditToken":"dc_...","maxBudgetUsd":0.05}'

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

Example response

{
  "runId": "run_…",
  "decisionId": "dec_…",
  "status": "complete",
  "steps": [
    {
      "step": 1,
      "status": "ok",
      "tool": {
        "slug": "search",
        "seller": "agent402",
        "firstParty": true
      },
      "costUsd": 0.02,
      "result": {}
    }
  ],
  "budgetUsd": 0.02,
  "spentUsd": 0.02,
  "paidUsd": 0.001,
  "creditAppliedUsd": 0.02,
  "routingFeePct": 5,
  "leftoverCredit": null
}

From an MCP client

catalog.call {
  "slug": "decide-execute",
  "params": {
    "decisionId": "dec_2b1c9e0f4a7d4c3e9b8a1f00",
    "creditToken": "dc_...",
    "maxBudgetUsd": 0.05
  }
}

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

Errors and behavior

• decisionId is 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: settlement is cancelled when the tool fails.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key (Authorization: Bearer a402_...) also pays it.
• Long-running: payment settles after the work finishes, so only EVM exact payments are offered.
• Priced per request: the 402 quotes this body, between $0.001 and $3.
• A GET or HEAD to /api/decide/execute 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.

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?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/decide/execute", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "decisionId": "dec_2b1c9e0f4a7d4c3e9b8a1f00",
    "creditToken": "dc_...",
    "maxBudgetUsd": 0.05
  }),
});

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