Gas sponsorship

zkLogin users in the app never hold SUI for gas — transactions go through Enoki sponsorship. Agents can use the same HTTP proxy; the SDK never embeds Enoki private keys.

Flow

1. Build the transaction kind (onlyTransactionKind: true)
2. POST {sponsorUrl} with { network, sender, transactionKindBytes }
3. Sign the returned bytes with the keypair
4. POST {sponsorUrl}/execute with { digest, signature }
5. Wait for the digest on-chain

SDK helper

import { createSponsoredKeypairSigner, StreamLine } from "@streamline/sdk";

const signer = createSponsoredKeypairSigner({
  keypair,
  client,
  network: "testnet",
  // Your deployed app, e.g. https://app.example.com/api/sponsor
  sponsorUrl: process.env.SPONSOR_URL!,
});

const sl = new StreamLine({ network: "testnet", signer, client });

Or via the smoke script:

SPONSOR_URL=https://your-app/api/sponsor \
SUI_PRIVATE_KEY=… RECIPIENT=alice@streamline \
  npm run example:pay -w @streamline/sdk

Server requirements

The proxy must allowlist StreamLine Move targets (see the frontend enoki-targets module) and hold ENOKI_PRIVATE_API_KEY server-side only.