@stacc/offerbook-sdk

Isolated TypeScript client for the Jupiter Offerbook program — the rail for meme lending on launchpad coins.

Offerbook is time-based P2P lending: no oracle, no price liquidation, lender sets the terms. Crucially, the on-chain program (offerbkFMvVfpQhL8ZQ5iromnjct5rz3r52B9ewu3ie) has no token allowlist — any SPL / Token-2022 mint or NFT can be collateral or principal. The "verified tokens, USDC-only quote" you see on offerbook.jup.ag is purely their frontend + indexer curation. Drive the program directly and you can borrow/lend against any coin minted on the launchpad.

Why a separate package

The pump launchpad pins @coral-xyz/[email protected], but the Offerbook IDL is the Anchor 0.30+/Codama format (address + discriminator arrays). 0.29's Program cannot parse it. This package pins anchor 0.30 and is isolated so pump's graph is untouched. Do not import it into a 0.29 dependency tree.

Install & prove the unlock

cd pump/offerbook-sdk
pnpm install
pnpm demo:read           # lists Offerbook offers/loans for stacSOL, straight from chain
# RPC=... MINT=<any mint> pnpm demo:read

Read path (indexer)

const client = new OfferbookClient(new Connection(RPC));
const offers = await client.getOffersForCollateral(coinMint); // the per-coin book
const loans  = await client.getLoansForCollateral(coinMint);
const config = await client.getConfig();

Write path (offer creation)

import { createBorrowOfferIxs, createLendOfferIxs, cancelOfferIx } from "@stacc/offerbook-sdk";

// Borrow USDC against a meme coin you hold:
const ixs = await createBorrowOfferIxs(client, borrower, coinMint, {
  principalAmount: 100_000000,   // 100 USDC (raw, 6dp)
  collateralAmount: 500_000000000,
  apyBps: 2800, durationSecs: 7*86400, expirySecs: 86400,
});

Status / next

• ✅ read path (offers, loans, config) + create/cancel offer instructions
• ⏳ fill_* / repay_token_loan / claim_token_loan (need counterparty accounts derived from the fetched offer/loan) — next slice, with the NestJS lending indexer module in pump-v2-client-server.

Landmines

• One offer per wallet: the offer PDA seeds are ["offer", signer, signer_user], so a wallet has a single offer slot — cancel/fill before opening another.
• disable_repayment = 1 in live config (decoded 2026-06-28). Verify repay semantics before wiring the repay flow.
• Governance: admin can pause + retune fees; program is upgradeable. Not trustless.
• USDC-only is a product choice; the program accepts any principal mint, but non-USDC offers won't be surfaced/filled by anyone else's UI.