A crypto payment gateway locks in an exchange rate the moment a customer starts to pay (BitPay’s own documentation puts that window at 15 minutes) the customer sends crypto within it, the provider converts it, and a fixed amount of fiat lands in your bank account.
You never hold the crypto. That one mechanism is what lets a business accept crypto without taking on its volatility, and it’s what this guide walks through. Many businesses are drawn to the lower cost on cross-border transfers, the absence of chargeback fraud, and reaching a crypto-native customer base — but hold back because the space feels complex.
What "instant fiat settlement" actually means
Here's the sequence, stripped down to what actually happens on the processing side. I've built and run one of these flows:
- A customer sees a fiat price and its crypto equivalent, calculated at a locked rate.
- That rate holds for a fixed window. Something in the region of 10 to 15 minutes is standard. BitPay's own developer documentation confirms its invoices stay active for 15 minutes, which gives a customer time to pay and limits the provider's own market exposure.
- If the customer pays within the window, the payment gets picked up and confirmed.
- The provider converts the crypto at the rate it is already locked in. The merchant's balance reflects that fiat-equivalent value.
You’ll notice that Step 4 isn't a cash-out. The merchant will see the converted value land as a balance, and then choose what to do with it: hold it, convert further, or move it to a bank account.
Why this matters to finance teams
Volatility is one of the biggest concerns finance teams have about crypto payments. Most CFOs don’t want an asset on the books that can move 5% before lunch. A rate-lock-then-convert model resolves that issue, because if the merchant doesn’t hold the asset past the payment window, there’s nothing to mark to market.
A business that receives Bitcoin and holds it is taking a market position, whether it means to or not, but a business using instant fiat settlement is skipping that position entirely. The crypto functions like any other payment rail.
What happens behind the scenes
Platforms might say that transactions happen instantly, but it’s more complicated in practice. The rate lock and the crypto-side confirmation happen in minutes. The fiat leg to a bank account is a separate step, and providers vary. BitPay, for instance, settles converted funds the next business day.
If a provider’s pitch leans on the word “instant”, ask them to spell out what it means: instant conversion with next-day banking, same-day settlement, or something else?
The accounting question this raises
Crypto doesn't have its own IFRS standard. In 2019, the IFRS Interpretations Committee concluded that crypto holdings don't meet the definition of cash or a financial instrument. So, absent other guidance, they're accounted for as intangible assets under IAS 38, or as inventory under IAS 2 for firms that trade it as part of ordinary business. An intangible asset historically sits at cost less impairment. A business only ever recognises the downside, never the upside, until it sells.
US GAAP went further with FASB's ASU 2023-08, effective for fiscal years beginning after December 15, 2024. It requires in-scope crypto assets to be measured at fair value each period, gains and losses run through net income, disclosed separately from other intangibles.
This doesn’t apply if the business never holds the asset. A merchant using a rate-lock-and-convert gateway resolves the transaction to a fiat sale before it reaches the balance sheet.
What to check before choosing a provider
- Rate-lock window length. Shorter windows limit volatility exposure, but too short creates failed payments if a customer's wallet is slow to broadcast.
- What "settlement" actually means. Converted-and-confirmed on the crypto side happens fast. Fiat landing in your bank account is a separate timeline, ask for it in business days.
- Which currencies are supported on both sides. Not every provider settles on every fiat currency.
- What happens on a late or partial payment. The rate is only guaranteed within the window, so ask how the provider handles one that arrives late or short.
- How disputes and reconciliation work. A rate-locked, converted payment behaves differently from a card chargeback. Worth understanding before volume, not after.
Setup and accounting checklist
Setup
- Confirm the provider's rate-lock window and what happens if a payment misses it
- Get the fiat settlement timeline in writing (same-day, next business day, or longer)
- Confirm supported settlement currencies match your banking setup
- Ask how partial or late payments are handled
Accounting
- Confirm with your provider, and your auditor, that funds convert before they reach your account
- US GAAP-reporting: ASU 2023-08 only applies to crypto assets you actually hold, verify this model keeps you out of scope
- IFRS-reporting: confirm the same for IAS 38 / IAS 2
- Document the mechanism, not just the vendor relationship, in your revenue recognition policy
Rate-lock and convert is what lets a business take crypto payments without taking a position on crypto. Once the mechanism is clear, the accounting question answers itself: nothing to mark to market if nothing's ever held.
Confirm the details with your provider: rate-lock window, settlement timeline, supported currencies so that you can plan your cash flow around it.
Related reading: What Is a Crypto Payment Gateway? How It Works and What to Look For · How Pay-by-Crypto Works for B2B: Settlement, Chargebacks and Reconciliation · The Real Cost of Crypto Payments: On-Ramp, Off-Ramp and the Hidden Spread · B2B Crypto Payments: A Practical Guide for Businesses