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Reserve credit and authorize the fill.

GET 
liquidity/chain/:chainId/protocol/:protocol/deposit/:txHash/request

A borrow cost is the final, authorized borrowing offer issued by Sprinter Stash when a solver decides to proceed with a fill. It reserves credit under specific conditions, allowing solvers to confidently execute the cross-chain transaction.

See the Request Final Borrow Cost example payload and check out the optimization tips

Request​

Responses​

OK

Example Borrow Cost payload​

Fetch Borrow Cost Example Payload
const baseUrl = "https://api.sprinter.tech";
const destChainId = "eip155:8453"; // eip155:8453(Base), eip155:10 (Optimism), eip155:42161 (Arbitrum) destChainId must use capid format from our configuration
const protocol = "across"; // "across" or "mayan"
const txHash = "string"; // Source chain deposit TX
const response = await fetch(
  `${baseUrl}/liquidity/chain/${destChainId}/protocol/${protocol}/deposit/${txHash}/requests`,
  {
    method: "GET",
    headers: {
      "X-Auth-Token": "<your_api_key>",
    },
    body: {
      input: "callData", // encoded callData for destination ( Borrow & Fill) it also contains depositData prams for MPC validation
      caller: "address", // the address that will execute the borrow and fill ond destChainId
    },
  },
);

Fill Optimization Tips​

Here are some tips on getting the best performance and profit from your Sprinter Stash integration:

  1. Pre-fetch Borrow Cost - Call GET /type/{type}/quote as early as possible (when detecting intents) to evaluate solver profitability.

  2. Batch Gas Where Possible - Bundle execution and repayment transactions to reduce gas costs.

  3. Optimize for Slippage - Query quotes close to execution time to reduce stale pricing or slippage-induced fills.

  4. Handling Rate Limits - If you hit 429s, give it a moment and retry using retry_after value. You can request higher limits via support@sprinter.tech.

  5. Validate Transaction Hash Early - Ensure the user intent transaction is final and not reverted before calling /deposit/{txHash}/request.