# @usebutr/evm (/api/evm)



## Discovery [#discovery]

### `discoverEvmAdapters(onAdapter): () => void` [#discoverevmadaptersonadapter---void]

Subscribe to EIP-6963 announcements. Calls `onAdapter(adapter)` for each
discovered wallet; returns an unsubscribe function.

### `discoverInjectedAdapter(onAdapter, options: InjectedDiscoveryOptions): () => void` [#discoverinjectedadapteronadapter-options-injecteddiscoveryoptions---void]

Last-resort fallback for legacy EIP-1193-only `window.ethereum` wallets.

Constants: `ANNOUNCE_EVENT`, `REQUEST_EVENT` (EIP-6963 event names),
`GENERIC_INJECTED_ICON` (data-URI fallback icon).

## Adapter builder [#adapter-builder]

### `buildEvmAdapter(provider: Eip1193Provider, meta: ConnectorMeta): WalletAdapter` [#buildevmadapterprovider-eip1193provider-meta-connectormeta-walletadapter]

Wrap any EIP-1193 provider into a butr `WalletAdapter`. The basis for custom
EVM connectors.

## Helpers [#helpers]

* `bytesToHex(bytes: Uint8Array): string`
* `hexToBytes(hex: string): Uint8Array`
* `chainIdHexToDecimal(hex: string): string`
* `chainIdDecimalToHex(decimal: string): string`
* `formatEther(wei: bigint, decimals?: number): string`

## Chains [#chains]

* `EVM_CHAINS` — record keyed by chain id.
* `EVM_CHAINS_LIST` — array form (use in EVM-only chain pickers).

## Capabilities [#capabilities]

* `resolveEip6963Capabilities` — derive `WalletCapabilities` from EIP-6963
  provider info.
* `EIP6963_RDNS_WITH_REQUEST_ACCOUNTS` — RDNS allowlist for
  `wallet_requestPermissions` support.

## Types [#types]

`Eip1193Provider`, `Eip1193Listener`, `Eip1193RequestArgs`,
`Eip6963AnnounceEvent`, `Eip6963ProviderDetail`, `Eip6963ProviderInfo`,
`InjectedDiscoveryOptions`, `Eip6963CapabilityInput`.

**Source:** `packages/evm/src/index.ts`.