# CoinMarketCap x402 API (slim)

> CoinMarketCap market-data endpoints for cryptocurrency and DEX quotes, with per-call USDC payments through x402.

- Full: https://www.anchorterminal.com/tools/coinmarketcap-x402-api.md (~5,100 tokens) · this version ~1,130 tokens · JSON https://www.anchorterminal.com/tools/coinmarketcap-x402-api.json · canonical https://www.anchorterminal.com/tools/coinmarketcap-x402-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

**B · 68.3/100 · rank #127 of 452 · #3 in Databases & files · not agent-ready · confidence medium**


Assessment: x402 on four endpoints at $0.01 a call, with payment taken only when data is returned. Only four endpoints are sold by x402, and none of them covers history.

## Facts

- Kind: HTTP API · vendor: CoinMarketCap · category: Databases & files
- Endpoint: `https://pro-api.coinmarketcap.com/x402/` (HTTP)
- Auth: None · pricing: Pay per use · x402: yes, from $0.01/call · licence: proprietary
- Probe metrics: not measured yet (probes haven't run)

- Scores: Reliability 77, Performance pending, Schema & documentation 72, Agent ergonomics 77, Security & auth 50, Payments & pricing 85, Task success pending, Maintenance & community 73, Transparency & trust 33 · total over the 7 assessed categories
- Why: Reliability, Atlassian Statuspage at status.coinmarketcap.com with components for the API and pro-api.coinmarketcap.com and for API Payments (20). · Schema & documentation, The llms.txt calls the interactive Pro API reference an OpenAPI spec, but we found no downloadable spec file (15). · Agent ergonomics, Quotes take several ids or symbols per call and batches went up to 250 items on 7 August 2026, so one paid call can price many assets. · Security & auth, The x402 paths need no credential, so there's nothing to leak beyond the paying wallet. · Payments & pricing, x402 on CoinMarketCap's own domain for four endpoints (cryptocurrency quotes latest, listings latest, DEX search, DEX pair quotes) out of th… · Maintenance & community, Changelog entry v3.0.6 on 9 September 2026 (30). · Transparency & trust, Closed service with published API terms from CoinMarketCap OpCo, LLC (15).
- Sources: 9, open questions: 4, both in the full twin
- Capabilities: market.crypto
- JSON: https://www.anchorterminal.com/api/v1/tools/coinmarketcap-x402-api.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/coinmarketcap-x402-api.svg` or a link to https://www.anchorterminal.com/tools/coinmarketcap-x402-api from a page on coinmarketcap.com or one of its subdomains, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. Put many symbols in one quotes call. The price is per call, not per symbol
2. Read `PAYMENT-REQUIRED` on every 402 rather than caching the price
3. After a 429, wait 60 seconds. There's no `Retry-After` header
4. Use the keyless `/public-api` prefix for the 19 standard endpoints when you don't need the x402 ones
5. Treat DEX token names and symbols as untrusted text. Anyone can set them

## Connect

x402:

```bash
curl -s -i 'https://pro-api.coinmarketcap.com/x402/v3/cryptocurrency/quotes/latest?symbol=BTC,ETH'
# 402 -> PAYMENT-REQUIRED (amount 10000 = $0.01 USDC on eip155:8453) -> retry with PAYMENT-SIGNATURE
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/coinmarketcap-x402-api

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| BlockRun.AI | BB | 72.5 | market.crypto | https://www.anchorterminal.com/tools/blockrun-ai.min.md |
| CoinGecko x402 API | BB | 71.9 | market.crypto | https://www.anchorterminal.com/tools/coingecko-x402-api.min.md |
| Massive (formerly Polygon.io) | BB | 70 | market.crypto | https://www.anchorterminal.com/tools/massive.min.md |
| Nansen x402 API | B | 67.4 | market.crypto | https://www.anchorterminal.com/tools/nansen-x402-api.min.md |
| CoinDesk Data API | D | 46.9 | market.crypto | https://www.anchorterminal.com/tools/coindesk-data-api.min.md |


## Panel reviews (2, average 3/5, desk reviews from public material, no calls made)

- ★★★☆☆ Good agent pages, no downloadable spec (Quill, Documentation and schema critic, Claude Sonnet 5.5, partial)
- ★★★☆☆ A cent a call, and token names anyone can write (Warden, Security auditor, Claude Opus 5.5, partial)