SweepsterLaunch app

Sweepster for builders: a gasless cross-chain sweep API

Sweepster gives wallets, exchanges and dapps a gasless cross-chain token sweep API: your users sign once, and their ERC-20s move from any supported chain to any wallet — even from wallets holding zero native gas. You earn a configurable share of every sweep's fee.

How integration works

Three calls take a user from quote to a settled, delivered sweep. Your backend calls /quote and /intents with your API key; the user’s wallet signs exactly once (the order digest plus an EIP-7702 authorization) — there is no separate gas-funding step for them to do.

  1. 1. Quote

    Price the sweep, screen the token, and get back the exact unsigned order.

    POST /quote
{
  "owner": "0xYourUserWallet...",
  "tokenIn": "0xTokenTheyHold...",
  "tokenOut": "0xUSDC...",
  "destination": "0xWhereItShouldLand...",
  "amountIn": "1000000000000000000",
  "destChainId": 8453,
  "tier": "tier1",
  "subscriptionActive": false,
  "userId": "your-internal-user-id",
  "apiKey": "YOUR_BUILDER_API_KEY"
}

→ 200
{
  "quote": {
    "id": "quote_abc123",
    "crossChain": false,
    "expiresAtMs": 1731000000000,
    "total": "2003500",
    "builderId": "bld_you",
    "signingScheme": "eip7702",
    "settlementAddress": "0xSweepDelegate..."
  },
  "order": { /* unsigned SweepOrder — the exact bytes the user signs next */ }
}

  2. 2. Sign & submit

    The user signs the order plus a 7702 authorization in their wallet; you relay both to /intents.

    // In the user's wallet (not an API call): sign the returned order
// as an EIP-712 typed-data digest, and sign an EIP-7702 authorization
// delegating the EOA to settlementAddress. Then:

POST /intents
{
  "quoteId": "quote_abc123",
  "signature": "0x...",
  "authorization": {
    "address": "0xSweepDelegate...",
    "chainId": 8453,
    "nonce": 0,
    "r": "0x...",
    "s": "0x...",
    "yParity": 0
  }
}

→ 201
{ "id": "quote_abc123", "status": "submitted", "txHash": "0x..." }

  3. 3. Poll status

    Poll GET /intents/:id until the intent reaches a terminal status.

    GET /intents/quote_abc123

→ 200
{
  "id": "quote_abc123",
  "status": "delivered",
  "txHash": "0x...",
  "crossChain": false
}

Builder Program

Every sweep attributed to your API key carries a builder markup — a bps rate you set, capped at a per-builder maximum agreed with Sweepster — that you keep in full, split cleanly from Sweepster’s own protocol fee via an on-chain signed builder/builderFee field. The builder dashboard at dashboard.sweepster.xyz shows your accrued attribution and earnings and lets you rotate your API key. New integrators can self-serve create a zero-commission builder account from the dashboard (where self-serve signup is enabled) — Sweepster raises your commission cap on request; no approval is required to start integrating.

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