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FAQ

How do I verify a deposit is real?

Treat a deposit as real only when halfin tells you it confirmed — through a signed webhook your backend has verified — not when a customer shows you a wallet screenshot or a block explorer shows the transaction in the mempool. The authoritative signals are invoice.paid for an invoice and balance.credited for a static address, and both fire only after the transaction has cleared the network's confirmation threshold and survived any reorg. An unconfirmed transaction can be replaced, dropped, or reorganized out of the chain, so a mempool sighting is a promise, not a payment. The rule is simple: verify the webhook signature, then act on confirmed events only.

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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.How do I verify a webhook signature?Recompute the HMAC over the raw webhook bytes with your signing secret, then constant-time compare it to the signature header before any business action.Does halfin hold my funds?halfin describes its custody boundaries through signing, permissions, and audit, and makes no guarantee beyond that. It is not a regulated or licensed status.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 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.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.