Blockchain.com Data API

blockchain.info · Finance

Finance No Auth Free & Open Cryptocurrency Bitcoin Blockchain

Bitcoin blockchain data — transaction info, block details, wallet balances, exchange rates, and unspent outputs. Free, no API key for most endpoints.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET Get BTC/USD rate

Get Bitcoin exchange rates in all major currencies.

https://blockchain.info/ticker

Hover any highlighted part to learn what it does

curl -X GET "https://blockchain.info/ticker"

import requests
response = requests.get(
    "https://blockchain.info/ticker",
)
print(response.json())

const url = 'https://blockchain.info/ticker';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://blockchain.info/ticker"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://blockchain.info/ticker")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://blockchain.info/ticker";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET Get wallet balance

Get the satoshi balance of the Bitcoin genesis block address.

https://blockchain.info/q/addressbalance/1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf

Hover any highlighted part to learn what it does

curl -X GET "https://blockchain.info/q/addressbalance/1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf"

import requests
response = requests.get(
    "https://blockchain.info/q/addressbalance/1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf",
)
print(response.json())

const url = 'https://blockchain.info/q/addressbalance/1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf';

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	targetURL := "https://blockchain.info/q/addressbalance/1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf"
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://blockchain.info/q/addressbalance/1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf")

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://blockchain.info/q/addressbalance/1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf";
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

No API key needed
BTC price: GET https://blockchain.info/ticker
Address balance (satoshis): GET https://blockchain.info/q/addressbalance/{address}
Latest block: GET https://blockchain.info/latestblock
Transaction: GET https://blockchain.info/rawtx/{txhash}

What can you build with Blockchain.com Data API?

Blockchain.com Data API is a Finance API. Developers commonly use finance APIs for:

processing payments and handling transactions
building subscription and billing systems
automating invoicing and financial reporting
fraud detection and risk scoring
connecting to banking and accounting software

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Blockchain.com Data API is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide

Open documentation ↗