Best Blockchain APIs in 2026

The top 15 of 17 free Blockchain APIs, ranked by how easy they are to start with (API key, HTTPS, CORS), how reliable they are in our daily health checks, and what developers rate them. Get Started with Web3 API takes the top spot.

Last tested Oct 24, 2026 · Rankings update daily

1
Get Started with Web3 API
Online · 507 ms
Bilingual Web3 lessons, glossary search and role-based learning paths.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
2
TWZRD Agent Intel API
Online · 1223 ms
Solana on-chain agent trust scoring via MCP; 4 free tools to score, resolve and verify AI agent wallets.
- No API key needed
- Returns JSON at its URL
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
3
ClearTrace API
Online · 940 ms
Cross-frontend DEX attribution and execution quality data across Ethereum and L2s.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
4
Chainpoint API
Online · 1050 ms
Chainpoint is a global network for anchoring data to the Bitcoin blockchain.
- No API key needed
- HTTPS
No authHTTPSCORS ?
5
Dwellir API
Online · 1042 ms
RPC endpoints for 150+ blockchain networks, including Ethereum, Solana, Polkadot and Hyperliquid.
- Callable from the browser (CORS)
- HTTPS
apiKeyHTTPSCORS
6
Chainlink API
Online · 4717 ms
Build hybrid smart contracts with Chainlink.
- No API key needed
- HTTPS
No authHTTPSCORS ?
7
Helium API
Online · 1953 ms
Helium is a global, distributed network of Hotspots that create public, long-range wireless coverage.
- No API key needed
- HTTPS
No authHTTPSCORS ?
8
Etherscan API
Online · 1568 ms
Etherscan APIs derives data from Etherscan’s Ethereum (ETH) Block Explorer to cater for Ethereum applications through API Endpoints & API Pro Endpoints.
- Callable from the browser (CORS)
- HTTPS
apiKeyHTTPSCORS
9
SwiftNodes API
Online · 1700 ms
Multi-chain blockchain RPC nodes (Ethereum, Solana and 75+ networks).
- Callable from the browser (CORS)
- HTTPS
apiKeyHTTPSCORS
10
Bitquery API
Online · 2767 ms
Onchain GraphQL APIs & DEX APIs.
- Callable from the browser (CORS)
- HTTPS
apiKeyHTTPSCORS
11
Nownodes API
Online · 879 ms
Blockchain-as-a-service solution that provides high-quality connection via API.
- HTTPS
apiKeyHTTPSCORS ?
12
The Graph API
Online · 1106 ms
Indexing protocol for querying networks like Ethereum with GraphQL.
- HTTPS
apiKeyHTTPSCORS ?
13
Watchdata API
Online · 569 ms
Provide simple and reliable API access to Ethereum blockchain.
- HTTPS
apiKeyHTTPSCORS ?
14
Blockscout API
Online · 670 ms
Multichain block explorer REST API (with Etherscan-compatible JSON-RPC).
- HTTPS
apiKeyHTTPSNo CORS
15
Covalent API
Online · 1900 ms
Covalent is the leading modular data infrastructure layer that’s dedicated to solving the Long-Term Data Availability and the verifiability problem in AI.
- HTTPS
apiKeyHTTPSCORS ?

Blockchain APIs compared

Top Blockchain APIs compared
API	API key	HTTPS	CORS	Uptime	Response	Rating
Get Started with Web3	No	Yes	Yes	Up	507 ms	Not rated
TWZRD Agent Intel	No	Yes	Yes	Up	1223 ms	Not rated
ClearTrace	No	Yes	Yes	Up	940 ms	Not rated
Chainpoint	No	Yes	Unknown	Up	1050 ms	Not rated
Dwellir	Required	Yes	Yes	Up	1042 ms	Not rated
Chainlink	No	Yes	Unknown	Up	4717 ms	Not rated
Helium	No	Yes	Unknown	Up	1953 ms	Not rated
Etherscan	Required	Yes	Yes	Up	1568 ms	Not rated
SwiftNodes	Required	Yes	Yes	Up	1700 ms	Not rated
Bitquery	Required	Yes	Yes	Up	2767 ms	Not rated

More Blockchain APIs

Best Blockchain API FAQ

What is the best free Blockchain API in 2026?

Based on access, reliability and developer ratings, the top free Blockchain APIs right now are Get Started with Web3 API, TWZRD Agent Intel API and ClearTrace API. Get Started with Web3 API ranks first. Rankings update daily from health checks of all 17 Blockchain APIs in the directory.

What is the best Blockchain API without an API key?

Get Started with Web3 API, TWZRD Agent Intel API and ClearTrace API need no API key, so you can call them without signing up. 8 of the 17 ranked Blockchain APIs are keyless.

Which Blockchain API works from the browser?

Get Started with Web3 API, TWZRD Agent Intel API and ClearTrace API support CORS over HTTPS, so front-end JavaScript can call them directly without a proxy.

How are these APIs ranked?

Each API gets a score from: no API key (+), HTTPS (+), CORS support (+), 30-day uptime and response time from our daily health checks, and ratings from developers on this site. APIs that failed three checks in a row are left out until they recover.