Know what you're buying,
before you integrate

What does every status look like, including the stuck ones?

• A charge is pending, partially_paid, confirmed, expired or underpaid. Each one is reached automatically, and an overpayment still confirms, with isOverpaid set.
• Payout is tracked on its own, as settlementStatus: pending, completed or failed. “The customer paid” and “the money reached you” are two separate events.
• A transfer that lands after expiry is still credited. It never disappears.

Klap never holds funds, so it can’t reverse a payment. Outside escrow, refunds go out from your own wallet.

Which routes are live today, and who runs each leg?

• USDC and USDT on eight EVM networks, listed in the table above. Arc is USDC only, since USDT isn’t issued there.
• Klap runs every on-chain leg itself, on public 0xSplits contracts. No partner sits between the payer and you.
• Before creating a charge, Klap reads each token issuer’s on-chain freeze status and refuses a route that couldn’t pay one of its recipients.

No fiat rails. TRON is in progress and not live yet.

What does a payment cost, all in?

• 1% per settled payment. No monthly fee, no setup fee, no minimums, no prefunding.
• No spread and no FX: the payer sends the stablecoin you priced in, and you receive that same stablecoin.
• Anyone who settles a payout earns a 0.1% incentive, and it comes out of Klap’s 1%, not out of your share.

The payer pays network gas for their own transfer. On Arc, that gas is paid in USDC.

What do delayed, failed and retried payments look like?

• Every status change goes out as an HMAC-signed webhook, delivered in up to five attempts over about a day, plus a live stream over SSE.
• Each event carries a stable id, so a retried delivery is easy to deduplicate.
• In test mode you can push a charge into any state, including partial payment, overpayment, expiry and a failed payout, and watch your handler react.
• Every payment and payout links to its transaction on a public block explorer.

We don’t publish failure rates yet. We’d rather show real numbers once closed beta has enough volume to mean something.

Which compliance work stays with you?

• Klap is non-custodial software. It never holds funds or keys, so there is no custodial leg to license or audit.
• Issuer freezes are respected before a charge is created, not discovered after a payout fails.

KYC, AML, Travel Rule and sanctions screening on your customers stay with you or your ramp partner.

What happens to your money if you leave?

• Nothing. There is no Klap balance to withdraw. Each charge is an ownerless 0xSplits contract that can only pay out to its recipients.
• distribute() is public. If Klap went offline tomorrow, anyone could still settle a payment that already arrived.
• A charge is just an address, so running Klap next to another provider breaks nothing. Your full history stays on a public chain.