Blockchain API

Overview

Measurement Record

What actually happened when we called this API from our own infrastructure. Every value below was recorded by the request, not copied from the provider's documentation.

Request

GET https://blockchain.info/rawblock/00000000000000000007878ec04bb2b2e12317804810f4c26033585b3f81ffaa

Result

HTTP 200 · application/json · 5,454,777 bytes · compressed

Response time

2767 ms (median of 3) · fastest 2442 ms

Transport

TLSv1.3 · TLS_AES_256_GCM_SHA384 · certificate issued by DigiCert Inc

Browser CORS

Allowed — Access-Control-Allow-Origin: *

Served by

cloudflare

Recorded

2026-08-10

Available Data

The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.

Example Response

Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.

{
  "id": "bitcoin",
  "symbol": "btc",
  "current_price": 65432.1,
  "market_cap": 1280000000000,
  "price_change_24h": 1250.5,
  "price_change_percentage_24h": 1.95,
  "total_volume": 28500000000
}

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

const url = "https://www.blockchain.com/api";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "X-API-Key": "YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

import requests

url = "https://www.blockchain.com/api"
headers = {"X-API-Key": "YOUR_API_KEY"}

response = requests.get(url, headers=headers, timeout=30)
response.raise_for_status()
data = response.json()
print(data)

curl -s 'https://blockchain.info/rawblock/00000000000000000007878ec04bb2b2e12317804810f4c26033585b3f81ffaa'

What Can You Build?

// Fetch current cryptocurrency prices
const headers = { 'X-Api-Key': 'YOUR_API_KEY' };
const response = await fetch(`https://www.blockchain.com/api`, { headers });
const data = await response.json();
const coins = data.data || data.coins || data;
const top5 = Array.isArray(coins) ? coins.slice(0, 5) : [coins];
top5.forEach(coin => {
  console.log(`${coin.name || coin.symbol}: $${coin.price || coin.current_price}`);
});

// Track portfolio value with current prices
const headers = { 'X-Api-Key': 'YOUR_API_KEY' };
const holdings = { BTC: 0.5, ETH: 2.0 };
const response = await fetch(`https://www.blockchain.com/api`, { headers });
const data = await response.json();
let total = 0;
Object.entries(holdings).forEach(([symbol, amount]) => {
  const price = data[symbol]?.usd || 0;
  total += price * amount;
  console.log(`${symbol}: ${amount} x $${price} = $${(price * amount).toFixed(2)}`);
});
console.log(`Total portfolio value: $${total.toFixed(2)}`);

// Monitor price and trigger alerts
const headers = { 'X-Api-Key': 'YOUR_API_KEY' };
const ALERT_THRESHOLD = 50000;
const response = await fetch(`https://www.blockchain.com/api`, { headers });
const data = await response.json();
const price = data.price || data.bitcoin?.usd || 0;
console.log(`Current BTC price: $${price}`);
if (price > ALERT_THRESHOLD) {
  console.log('🚀 Price alert: BTC is above $' + ALERT_THRESHOLD);
}

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

How This API Fails

We deliberately sent this API a broken request and recorded exactly what came back on 2026-08-10. Knowing the shape of an error before you hit it makes error handling much easier to write.

{
  "error": "not-found-or-invalid-arg",
  "message": "Item not found or argument invalid"
}

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.