Blok3 - Cross-Chain Cryptocurrency API

Building next Opensea, Metamask, or Coinbase? We have the Cross-Chain data for you! We provide data about Ethereum, Bitcoin, and other chains in awesome GraphQL API.

Accessing the API

API is built on GraphQL, meaning you can get all the data you need in one HTTP POST. Everything is available at:
You can test the API by running this command:
curl -X POST \
        -H 'Content-Type: application/json' \
        -d '{"query": "{ ethereum { status { blk } } }"}'
At examples you can find a few example queries, th should get you started. If you want to explore the API details, head into the playground.

Available data


Currently, only ETH & BTC data is available. We're working on indexing more chains.

Why Blok3?

Other solutions are rather low quality, expensive, and require multiple round-trips to get all the necessary data, degrading the user experience.

We provide unified GraphQL API, allowing you to fetch all the data in single API call, and allow you to fetch up to 1000 objects per call.The implementation utilizes custom NoSQL database, that will blow any complex SQL-based solution out of the water when it comes to latency.

API Limitations

API is currently rate limited to one request every 2 seconds. This is to prevent denial-of-service by exhausting resources.

If you need more, please reach out.