Coin search

Resolve a name or ticker to coin ids: full-text search returning matching coins (id, symbol, name, market cap rank, ordered by rank), exchanges (id, name, market type) and categories (id, name), plus NFT collections. Send GET /api/coin-search with the required field query and pay $0.005 per call over x402 or MPP (there is no free tier). It returns a JSON object with source, fetchedAt, cached, query, counts and 4 more.

`limit` per group 1-50 (default 10). The id resolver for every other coin tool: an agent holding "PEPE" or "render" gets the canonical id here before calling coin-profile, coin-ohlc or coin-history. Cached in-process for 5 minutes.

Category: Crypto & onchain data · Tags: crypto search resolve symbol coin-id exchanges categories lookup

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Parameters

Example request

curl -i "https://agent402.tools/api/coin-search?query=usdc&limit=5"

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

Example response

{
  "source": "coingecko",
  "fetchedAt": "2026-08-22T13:20:00.000Z",
  "cached": false,
  "query": "usdc",
  "counts": {
    "coins": 5,
    "exchanges": 0,
    "categories": 1,
    "nfts": 0
  },
  "coins": [
    {
      "id": "usd-coin",
      "symbol": "USDC",
      "name": "USDC",
      "rank": 6
    }
  ],
  "exchanges": [],
  "categories": [
    {
      "id": "usdc-stablecoins",
      "name": "USDC Stablecoins"
    }
  ],
  "nfts": []
}

From an MCP client

catalog.call {
  "slug": "coin-search",
  "params": {
    "query": "usdc",
    "limit": 5
  }
}

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

Errors and behavior

• query 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 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 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.
• A POST with a JSON body to /api/coin-search is served as this GET, with the body as the input.
• 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?.(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/coin-search?query=usdc&limit=5");

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