polkadot-api (PAPI)

import { createClient } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { paseo } from "@polkadot-api/descriptors";

const client = createClient(getWsProvider("wss://paseo.rpc.amforc.com"));
const api = client.getTypedApi(paseo);

const { data } = await api.query.System.Account.getValue(wallet.account.walletAddress);
// Paseo testnet uses PAS with 10 decimals
const pas = `${Number(data.free) / 1e10} PAS`;

const message = new TextEncoder().encode("Hello from butr + polkadot-api");
const { signature } = await wallet.connector.signMessage(message);
// `signature` is a Uint8Array — render as hex for display.

import { MultiAddress } from "@polkadot-api/descriptors";
import { connectInjectedExtension } from "polkadot-api/pjs-signer";
import type { PolkadotSignerHandle } from "@usebutr/polkadot";

// getSigner() returns { extensionName, address } — not a PAPI signer.
const handle = (await wallet.connector.getSigner()) as PolkadotSignerHandle;

// Bridge: pjs-signer reads the injected extension and produces a PolkadotSigner.
const extension = await connectInjectedExtension(handle.extensionName);
const account = extension.getAccounts().find((a) => a.address === handle.address);
if (!account) throw new Error("Active account not found in the injected extension");

// Self-transfer of 0.1 PAS (1_000_000_000 Planck; Paseo uses 10 decimals).
const tx = api.tx.Balances.transfer_keep_alive({
  // oxlint-disable-next-line new-cap -- MultiAddress.Id is a polkadot-api enum-variant constructor
  dest: MultiAddress.Id(handle.address),
  value: 1_000_000_000n,
});

tx.signSubmitAndWatch(account.polkadotSigner).subscribe({
  next: (event) => console.log("Tx:", event.type),
  error: (err) => console.error("Tx error:", err),
  complete: () => console.log("Finalized"),
});
// Look up on https://paseo.subscan.io after "Finalized"