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FAQ

How long is an invoice valid?

Each invoice is valid for its own expiry window — a finite period during which the customer can pay the locked amount. Treat the window as a per-invoice setting rather than a single global number: a checkout cart and a multi-day quote can carry different lifetimes. While the window is open, the payable amount is held and the payment page accepts a deposit. When the window passes without enough settling on-chain, halfin closes the invoice and an invoice.expired webhook fires, so your backend learns the outcome in code rather than by polling.

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halfin FAQ — how crypto payments work end to endHow halfin invoicing, checkout, deposit addresses, payouts, conversion, and webhooks work. Browse every question or read the cross-cutting answers.What happens when an invoice expires?When a halfin invoice's window passes without enough settling on-chain, it closes and invoice.expired fires. A deposit that lands later surfaces as invoice.late_deposit — not lost.Can a customer pay an invoice late?A deposit that lands after a halfin invoice expires fires invoice.late_deposit — the funds are credited and matched to the invoice, and you decide how to treat the order.Are API keys scoped?Yes. A halfin API key carries only the permissions you grant it, scoped to the operations it needs — a read or invoice key cannot release payouts.Are API requests rate limited?Yes. Public auth endpoints are rate limited per IP and authenticated API-key requests are limited too. Design clients to back off and retry idempotently.Are crypto payments final?Yes — a confirmed on-chain transfer is irreversible and there are no chargebacks. Finality is a property of the chain, which is what makes reconciliation clean.Are there chargebacks with crypto payments?No. A confirmed on-chain payment is final, so there are no card-style forced reversals. A refund is a deliberate action you choose to issue.Are there monthly or setup fees?halfin's commercial pricing is not published on this site yet, so there is no monthly or setup figure to quote here. Building in the sandbox is free.Assets and networks questionsFrequently asked questions drawn from the halfin assets and networks pages. Each one links to a standalone answer.Can a customer reuse the same deposit address?Yes. A halfin static deposit address is persistent, so repeat deposits to the same address credit the same customer — no new invoice or address per top-up.Can I auto-convert incoming payments to a stablecoin?Yes. halfin balance conversion can run automatically toward a target asset such as a stablecoin, so incoming payments settle in one currency on credit.Can I bill in fiat and get paid in crypto?Yes. Set amount_fiat and fiat_currency on a halfin invoice; the customer pays the equivalent in any supported asset at the locked rate you bill against.