Decide: tool plan for a task

Describe a job and get a call-ready plan: which tools, across this catalog and outside x402 sellers with a recently verified 402, solve it end to end, in what order, with fallbacks and input params that validate against each tool's schema. Send POST /api/decide with the required field task and pay quoted per request from $0.003 over x402 or MPP (there is no free tier). It returns a JSON object with decisionId, task, depth, plan, estimatedCostUsd and 6 more.

Priced by depth: quick $0.003 (one best tool), plan $0.01 (the default: steps, fallbacks, params from your task, cost and latency estimates), full $0.03 (the plan plus a compiled prompt). The fee comes back as a credit toward running the plan with POST /api/decide/execute. Free first: GET /api/find?q=<task> answers a multi-step task with a keyword plan sketch. The ranking formula has no first-party term; every tool carries firstParty. Uncovered needs are listed in gaps.

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/decide \
  -H "Content-Type: application/json" \
  -d '{"task":"Resolve the ENS name vitalik.eth and read its wallet balance on Base","depth":"plan"}'

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

Example response

{
  "decisionId": "dec_…",
  "task": "Resolve the ENS name vitalik.eth and read its wallet balance on Base",
  "depth": "plan",
  "plan": [
    {
      "step": 1,
      "purpose": "resolve the ENS name to an address",
      "tool": {
        "slug": "ens-resolve",
        "firstParty": true,
        "endpoint": "https://agent402.tools/api/ens-resolve",
        "method": "GET",
        "priceUsd": 0.001,
        "exampleParams": {
          "name": "vitalik.eth"
        }
      },
      "fallbacks": [],
      "dependsOn": []
    },
    {
      "step": 2,
      "purpose": "read that address's balance on Base",
      "tool": {
        "slug": "wallet-balance",
        "firstParty": true,
        "endpoint": "https://agent402.tools/api/wallet-balance",
        "method": "POST",
        "priceUsd": 0.002,
        "exampleParams": {
          "address": "{{step 1}}",
          "network": "base"
        }
      },
      "fallbacks": [],
      "dependsOn": [
        1
      ]
    }
  ],
  "estimatedCostUsd": 0.003,
  "estimatedLatencyMs": 3000,
  "confidence": 0.9,
  "gaps": [],
  "priceUsd": 0.01,
  "executionCredit": {
    "amountUsd": 0.01,
    "token": "dc_…",
    "redeemWith": "POST /api/decide/execute { decisionId, creditToken }"
  },
  "feedbackToken": "fb_…"
}

From an MCP client

catalog.call {
  "slug": "decide",
  "params": {
    "task": "Resolve the ENS name vitalik.eth and read its wallet balance on Base",
    "depth": "plan"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for decide; the stdio package pays it from a wallet or from an AGENT402_CREDITS_KEY issued earlier. Local install: npx -y agent402-mcp@0.13.32.

Errors and behavior

• task 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 over x402, MPP or a prepaid credits key: settlement runs after the tool and only on a successful response. 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.
• Priced per request: the 402 quotes this body, between $0.003 and $0.03.
• A GET or HEAD to /api/decide 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: "$0.03" }); // 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/decide", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "task": "Resolve the ENS name vitalik.eth and read its wallet balance on Base",
    "depth": "plan"
  }),
});

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