CoinCap

Overview

CoinCap’s API provides real-time cryptocurrency market data — asset prices, rankings, history, exchanges, and rates — keyless and free. It was a popular no-auth alternative for crypto dashboards and portfolio trackers.

⚠️ Status (verified 2026-08): api.coincap.io was unreachable from this network (connection failures on both direct and proxied requests). The API may be having an outage — verify availability before building on it, and check the official status/docs.

What it provides (when up)

• Asset prices & rankings: GET /v2/assets
• Single asset: GET /v2/assets/bitcoin
• Price history: GET /v2/assets/bitcoin/history?interval=d1
• Exchange rates: GET /v2/rates
• Exchanges list: GET /v2/exchanges

Quick Start (once reachable)

curl "https://api.coincap.io/v2/assets/bitcoin"

{
  "data": {
    "id": "bitcoin",
    "rank": "1",
    "symbol": "BTC",
    "priceUsd": "67234.50",
    "marketCapUsd": "..."
  },
  "timestamp": 1724300000000
}

Authentication

None — keyless (optional free API key for higher rate limits).

FAQ

Is CoinCap free? Yes — keyless with optional free key for higher limits.

Why can’t I reach it? 2026-08 verification showed connection failures — the service may be experiencing an outage. Verify current availability.

What data does it provide? Asset prices, market caps, rankings, historical data, exchange rates, and exchange lists.