Crypto market overview

Top N coins by market capitalization with full market snapshot per coin: rank, price, 24h change, 7d change, 24h volume, market cap, circulating supply, and all-time high. Send GET /api/crypto-market with no required fields (2 optional) and pay $0.015 per call over x402 or MPP (there is no free tier). It returns a JSON object with currency, count and coins.

Default 10, max 100 per call. Backed by CoinGecko's public API.

Category: Live public data · Tags: crypto market ranking marketcap top-coins

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Parameters

Example request

curl -i "https://agent402.tools/api/crypto-market?limit=10&currency=usd"

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

Example response

{
  "currency": "usd",
  "count": 2,
  "coins": [
    {
      "rank": 1,
      "id": "bitcoin",
      "symbol": "btc",
      "name": "Bitcoin",
      "price": 67234.12,
      "change24hPct": 1.42,
      "change7dPct": 4.81,
      "volume24h": 28100000000,
      "marketCap": 1320000000000,
      "circulatingSupply": 19700000,
      "ath": 73750,
      "athDate": "2024-03-14T07:10:36Z"
    },
    {
      "rank": 2,
      "id": "ethereum",
      "symbol": "eth",
      "name": "Ethereum",
      "price": 3520.45,
      "change24hPct": 2.18,
      "change7dPct": 1.92,
      "volume24h": 14200000000,
      "marketCap": 423000000000,
      "circulatingSupply": 120300000,
      "ath": 4878.26,
      "athDate": "2021-11-10T14:24:11Z"
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "crypto-market",
  "params": {
    "limit": 10,
    "currency": "usd"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for crypto-market; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. 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 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 issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/crypto-market 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/crypto-market?limit=10&currency=usd");

Part of these workflows

Crypto market overview is one step in these 3 skill packs, each sold as a single call:

• DeFi protocol scanner - Due-diligence a DeFi protocol in one workflow: live token price, market context, protocol TVL across chains, and recent news - the on-chain and off-chain picture together.
• Macro dashboard refresh - The full macro + crypto dashboard in one call: 5 FRED series, 5 Treasury reads, yield-curve spread, crypto market/trending/global, and live gas - the 14-tool basket recurring buyers refresh every cycle, bundled below its a la carte price.
• Crypto research - Pull live price, market structure, OHLC history, trending status, global market context, and recent news for a single coin in one pass.

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