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@turnkey/viem

npm This package contains helpers to use Viem with Turnkey. We provide a Turnkey Custom Account (signer) which implements the signing APIs expected by Viem clients. If you need a lower-level, fully typed HTTP client for interacting with Turnkey API, check out @turnkey/http.

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Getting started

$ npm install viem @turnkey/viem

import { createAccount } from "@turnkey/viem";
import { TurnkeyClient } from "@turnkey/http";
import { ApiKeyStamper } from "@turnkey/api-key-stamper";
import { createWalletClient, http } from "viem";
import { sepolia } from "viem/chains";

async function main() {
  // Create a Turnkey HTTP client with API key credentials
  const httpClient = new TurnkeyClient(
    {
      baseUrl: "https://api.turnkey.com",
    },
    // This uses API key credentials.
    // If you're using passkeys, use `@turnkey/webauthn-stamper` to collect webauthn signatures:
    // new WebauthnStamper({...options...})
    new ApiKeyStamper({
      apiPublicKey: "...",
      apiPrivateKey: "...",
    }),
  );

  // Create the Viem custom account
  const turnkeyAccount = await createAccount({
    client: httpClient,
    organizationId: "...",
    signWith: "...",
    // optional; will be fetched from Turnkey if not provided
    ethereumAddress: "...",
  });

  // Below: standard Viem APIs are used, nothing special!

  const client = createWalletClient({
    account: turnkeyAccount,
    chain: sepolia,
    transport: http(`https://sepolia.infura.io/v3/$(YOUR_INFURA_API_KEY)`),
  });

  const transactionRequest = {
    to: "0x08d2b0a37F869FF76BACB5Bab3278E26ab7067B7" as `0x${string}`,
    value: 1000000000000000n, // 0.001 ETH
  };

  const txHash = await client.sendTransaction(transactionRequest);
  console.log(`Success! Transaction broadcast with hash ${txHash}`);
}

main().catch((error) => {
  console.error(error);
  process.exit(1);
});

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Testing (Local)

  1. Copy .env.example to .env 
    $ cp .env.example .env
  2. Start the Anvil node in one shell:
    • Install Foundry & Anvil if you haven’t done so already
    • Add Foundry to your $PATH 
      $ export PATH="$PATH:$HOME/.foundry/bin"
    • Source your env e.g. 
      $ source ~/.zshrc
    • Run foundryup to install Anvil 
      $ foundryup
    • Start Anvil 
      $ pnpm anvil
  3. Run the tests in a new shell: 
    $ pnpm test

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See also

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Documents

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Modules