How to Choose the Best Blockchain API in 2026
There are 11 Blockchain APIs in our directory. Of these, 4 require no authentication, making them ideal for quick prototyping. 4 are rated beginner-friendly.
Scores last tested: 2026-07-31
Quick Comparison: Top 9 Blockchain APIs
Ranked by API Score. Measured means we called a real endpoint of that API; Est. means the score is derived from metadata because the endpoint could not be called without credentials. Discontinued APIs are excluded.
| Name | API Score | Auth | HTTPS | CORS | Difficulty |
|---|---|---|---|---|---|
| Chainlink | 87 A Est. | No Auth | ✓ | ? | Beginner |
| Etherscan | 87 A Est. | API Key | ✓ | ✓ | Intermediate |
| Chainpoint | 82 A Est. | No Auth | ✓ | ? | Beginner |
| Helium | 82 A Est. | No Auth | ✓ | ? | Beginner |
| Steem | 80 A Est. | No Auth | ✗ | ✗ | Beginner |
| Bitquery | 77 B Est. | API Key | ✓ | ✓ | Intermediate |
| Nownodes | 72 B Est. | API Key | ✓ | ? | Intermediate |
| The Graph | 72 B Est. | API Key | ✓ | ? | Intermediate |
| Watchdata | 72 B Est. | API Key | ✓ | ? | Intermediate |
Free Blockchain APIs (No Auth)
These APIs require no API key or signup. Start using them immediately.
Chainlink
Chainlink is a decentralized oracle network that connects smart contracts to real-world data like price feeds, random numbers, and external APIs.
Chainpoint
⭐ Beginner's PickChainpoint anchors any data hash to the Bitcoin blockchain, creating a tamper-proof proof of existence for documents, records, or any digital content.
Helium
⭐ Beginner's PickThe Helium API provides access to legacy blockchain data for the Helium IoT network — hotspot locations, earnings, network coverage, and device activity.
Steem
⭐ Beginner's PickSteem is a blockchain-based social media platform with a public API for reading posts, comments, votes, account data, and blockchain operations.
Try It in 5 Minutes: Chainlink
Quick implementation example using Chainlink.
Using curl
# Chainlink is blockchain-native; use ethers.js or wagmi in production.
# To query ETH/USD price feed on Ethereum via JSON-RPC:
curl -X POST https://cloudflare-eth.com \
-H 'Content-Type: application/json' \
-d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419","data":"0xfeaf968c"},"latest"],"id":1}' JavaScript
const url = "https://chain.link/developer-resources";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); New to APIs? Read our Getting Started Guide →
Frequently Asked Questions
How many Blockchain APIs are available?
There are 11 Blockchain APIs in our directory as of 2026.
Are there free Blockchain APIs?
Yes, 4 Blockchain APIs require no authentication and are completely free to use.
What is the easiest Blockchain API to use?
Chainlink is one of the easiest to get started with. It is rated as beginner-level and requires no authentication.
Do I need an API key for Blockchain APIs?
It depends. 4 APIs need no authentication, 6 require an API key, and 0 use OAuth.