ClearTrace API vs Helium API

Two free Blockchain APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

Choose ClearTrace API if you want to call it from browser JavaScript, faster responses.
Choose Helium API if its data fits your use case better; on access and reliability it's level with ClearTrace API.

	ClearTrace API	Helium API
What it does	Cross-frontend DEX attribution and execution quality data across Ethereum and L2s.	Helium is a global, distributed network of Hotspots that create public, long-range wireless coverage.
Provider	cleartracedata.com	Helium
API key	Not needed	Not needed
HTTPS	Yes	Yes
CORS (browser calls)	Yes	Unknown
Status today	Online · 940 ms	Online · 1953 ms
Uptime (30 days)	Up	Up
Developer rating	Not rated yet	Not rated yet
Price	Free / free tier	Free / free tier

Cross-frontend DEX attribution and execution quality data across Ethereum and L2s.

Strengths

Helium is a global, distributed network of Hotspots that create public, long-range wireless coverage.

How to access archived Helium L1 blockchain data via AWS S3 or torrent downloads.

Strengths

Prototyping or a tutorial? Pick the one that needs no API key (both qualify).
Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
Still unsure? Both are free to try: send one request to each and compare the data you get back.

Neither needs an API key; you can call both straight away.

ClearTrace API supports CORS, so front-end JavaScript can call it directly. Call the other from a server.