Crypto categories by market cap

Coin categories (Layer 1, Meme, AI, DeFi, Stablecoins, RWA, ...) ranked by market cap, with 24h market cap change %, 24h volume and the top-3 coins per category. Send GET /api/coin-categories with no required fields (3 optional) and pay $0.005 per call over x402 or MPP (there is no free tier). It returns a JSON object with source, fetchedAt, cached, order, count and 2 more.

Order by market_cap_desc (default), market_cap_asc, market_cap_change_24h_desc/asc, name_asc/desc; optional `query` substring filter on category name/id; limit 1-100 (default 25). The sector-rotation view: which narratives are gaining or bleeding today. Cached in-process for 5 minutes.

Category: Crypto & onchain data · Tags: crypto categories sectors narrative market-cap rotation defi meme

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Parameters

Example request

curl -i "https://agent402.tools/api/coin-categories?order=market_cap_desc&limit=10"

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

Example response

{
  "source": "coingecko",
  "fetchedAt": "2026-08-22T13:20:00.000Z",
  "cached": false,
  "order": "market_cap_desc",
  "count": 1,
  "totalCategories": 400,
  "categories": [
    {
      "rank": 1,
      "id": "smart-contract-platform",
      "name": "Smart Contract Platform",
      "marketCap": 2261471553524.96,
      "marketCapChange24hPct": 1.1784,
      "volume24h": 95000000000,
      "topCoins": [
        "bitcoin",
        "ethereum",
        "solana"
      ],
      "updatedAt": "2026-08-22T13:15:00.000Z"
    }
  ]
}

From an MCP client

catalog.call {
  "slug": "coin-categories",
  "params": {
    "order": "market_cap_desc",
    "limit": 10
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for coin-categories; 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 (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/coin-categories 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-categories?order=market_cap_desc&limit=10");

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