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FAQ

Which currencies can I invoice in?

You can denominate an invoice two ways. Anchor it in fiat — set amount_fiat plus a fiat_currency code — and the customer pays the equivalent in whichever supported asset they hold, converted at the locked rate. Or fix it to a specific crypto figure — set amount plus a crypto currency code, with an optional network — and the customer pays exactly that token amount. Either way the supported rails are the same broad set: Bitcoin, Ethereum and ERC-20, the EVM L2s, BNB Smart Chain, Tron, the XRP Ledger, and Solana, with USDT and USDC on the chains where each lives.

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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.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.Can I set a fixed crypto amount?Yes. A fixed-asset invoice takes amount plus currency (a crypto code) and an optional network — the payable quantity is exactly what you state, no rate conversion.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.