Solana Agent Starter — Token-2022 Invoice Rails Starter Kit

Every transfer knows its invoice. This starter kit ships the three components that make that real on Solana.

The details

**Token-2022 transfer hook that rejects any payment not settling a registered invoice.** The binding lives inside the token program, so wallets and payers can't strip it. A memo can be dropped; a hook can't.

**Indexer and matcher that reconcile bound transfers against your QuickBooks or Xero export.** Exact invoice-hash match first, amount+payee heuristic second, confidence score on every row. On 400ms settlement, the books update with the payment, not weeks later.

**Escrow PDA state machine: partial, complete, disputed, refunded.** 72-hour dispute window, evidence hashes, signed refund claims. No oracle, no court.

What's inside:

What's inside

• `transfer-hook/`: Anchor program with ExtraAccountMetaList init and the invoice PDA assert that runs at settlement
• `escrow/`: Anchor program with deposit_partial, settle, open_dispute, refund
• `indexer/`: websocket logSubscribe into the matcher queue, Geyser-swappable
• `client/`: PDA derives, hook-aware transfer builder, CSV matcher
• `ARCHITECTURE.md`: mermaid diagrams of the flow and the dispute state machine

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