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polkadot-js / api Public

Promise and RxJS APIs around Polkadot and Substrate based chains via RPC calls. It is dynamically generated based on what the Substrate runtime provides in terms of metadata.

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Apache-2.0 license

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@polkadot/api

This library provides a clean wrapper around all the methods exposed by a Polkadot/Substrate network client and defines all the types exposed by a node. For complete documentation around the interfaces and their use, visit the documentation portal.

If you are an existing user, please be sure to track the CHANGELOG when changing versions.

tutorials

Looking for tutorials to get started? Look at examples for guides on how to use the API to make queries and submit transactions.

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Promise and RxJS APIs around Polkadot and Substrate based chains via RPC calls. It is dynamically generated based on what the Substrate runtime provides in terms of metadata.

Topics

api blockchain web3 jsonrpc substrate polkadot polkadot-js

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Readme

License

Apache-2.0 license

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1.1k stars

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Releases294

v16.2.1 Latest Jun 10, 2025

+ 293 releases

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+ 138 contributors

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