polkadot-apps

Interact with smart contracts (Solidity and ink!) on Polkadot Asset Hub. Use when: reading contract state, submitting contract transactions, integrating CDM-managed contracts via cdm.json, or working with raw contract ABIs. Covers @polkadot-apps/contracts (ContractManager, createContract, codegen).

End-to-end scaffolding and implementation of Polkadot applications using @polkadot-apps packages. Use when: creating a new Polkadot project, building a dApp, scaffolding chain interactions, choosing which @polkadot-apps packages to install, or when a user says "build me a Polkadot app". Handles both developer-guided and fully autonomous (non-developer) workflows.

Connect to Polkadot chains (Asset Hub, Bulletin, Individuality) using typed APIs from @polkadot-apps/chain-client and @polkadot-apps/descriptors.

Submit transactions, connect wallets, manage signers, and handle keys in polkadot-apps. Use when: submitting transactions, connecting browser wallet extensions (Talisman, Polkadot.js, SubWallet), integrating Host API signing (Polkadot Desktop/Mobile), managing multi-provider wallet accounts, deriving keys, or creating dev signers for testnet. Covers @polkadot-apps/tx (submit/watch), @polkadot-apps/signer (wallet connection, account management, multi-provider signing), and @polkadot-apps/keys (key derivation, session keys).

Use when publishing or subscribing to ephemeral messages on the Polkadot Statement Store. Covers StatementStoreClient lifecycle, two connection modes (host and local), topic/channel creation, ChannelStore last-write-wins semantics, data size limits, and StatementTransport BYOD.

Use when uploading or retrieving data on the Polkadot Bulletin Chain, working with CID-based decentralized storage, IPFS gateway access, or the BulletinClient SDK. Covers upload, batch upload, fetch, query, CID computation, and gateway utilities.

Use when working with Polkadot address encoding, SS58, H160, EVM address conversion, cryptographic encryption (AES, ChaCha, NaCl, HKDF), byte encoding/decoding, token formatting (planck), key-value storage, or structured logging in @polkadot-apps packages. Covers address, crypto, utils, storage, and logger utilities.