Action Delegates

<KeystoneProvider
  sessionToken={token}
  actionDelegates={{
    onDepositRequired: async (leg, depositInfo) => {
      // leg: the settlement leg being deposited
      // depositInfo: pre-encoded calldata and metadata
      const result = await yourBackend.submitDeposit(depositInfo);
      return { txHash: result.txHash };
    },
    onApprovalRequired: async (leg, approvalInfo) => {
      // ERC-20 approve() before deposit
      const result = await yourBackend.submitApproval(approvalInfo);
      return { txHash: result.txHash };
    },
  }}
>

// Express example
app.post('/api/deposit', async (req, res) => {
  const { calldata, escrowAddress, chainId } = req.body;

  // Option 1: Fireblocks
  const tx = await fireblocks.createTransaction({
    assetId: chainIdToFireblocksAsset(chainId),
    destination: { type: 'ONE_TIME_ADDRESS', oneTimeAddress: { address: escrowAddress } },
    extraParameters: { contractCallData: calldata },
  });

  // Option 2: BitGo
  const tx = await bitgo.sendTransaction({
    address: escrowAddress,
    data: calldata,
    chain: chainId,
  });

  // Option 3: Any signing infrastructure
  const tx = await yourSigner.sendTransaction({
    to: escrowAddress,
    data: calldata,
    chainId,
  });

  res.json({ txHash: tx.hash });
});

<WagmiProvider config={wagmiConfig}>
  <KeystoneProvider sessionToken={token}>
    {/* useDeposit will use the connected wallet */}
  </KeystoneProvider>
</WagmiProvider>