Fiat on-ramps and off-ramps are the plumbing that connects banking to crypto. Every wallet, neobank, and stablecoin app hits the same problem: how do you take a Visa card in Lagos or a SEPA transfer in Berlin, turn it into USDC, then send euros back to that bank account a week later without rebuilding a PSP from scratch?
The answer for most teams is a fiat on-ramp and off-ramp API. A single integration handles KYC, payment acceptance, compliance, chain selection, and settlement; you focus on product. The tradeoffs come down to country coverage, payment methods, fees, and developer experience. For context, see Stripe Crypto Onramp and MoonPay’s business arm.
This guide compares six production-ready providers for 2026 and shows how to test them quickly with Apidog. If you are also building on stablecoin rails, pair this with our guide on how to use the Circle API.
TL;DR
- A fiat on-ramp API converts bank money to crypto; an off-ramp does the reverse and settles back to a bank account.
- Pick by country coverage, payment methods (card, ACH, SEPA, UPI, Pix), fee structure, and whether you need embedded widget or full API access.
- MoonPay and Transak have the widest country coverage; Ramp Network has the cleanest EU and UK developer experience.
- Coinbase Onramp and Stripe Crypto Onramp work best if you are already US-focused and want a trusted brand.
- Kado leads on cheap off-ramps and stablecoin-native flows.
- Always test the full on-ramp and off-ramp loop in sandbox before going live; fees and KYC friction surface fast.
What to look for in a fiat on-ramp off-ramp API
Country and currency coverage. Count supported fiat currencies and confirm the countries you care about. A provider that covers 150 countries on paper can still block card payments in half of them.
Payment methods. Cards are universal but expensive. ACH, SEPA, UPI, Pix, and iDEAL lower fees and lift conversion in their regions. For India or Brazil, UPI and Pix are not optional.
KYC handling. Decide if the provider runs KYC end-to-end or hands it back to you. Full-service KYC is faster to ship; pass-through gives you control over UX. For standalone identity stacks, see our breakdown of the best KYC APIs.
Settlement time and fees. Card on-ramps settle in minutes but charge 3 to 5 percent. ACH and SEPA take 1 to 3 days at under 1 percent. Off-ramps vary; some providers eat 2 percent on the way out.
Embedded versus hosted. A hosted widget is a 30-minute integration. A full API gives you native UI but requires licensing. Most teams start hosted and graduate to API.
Stablecoin and off-ramp support. USDC and USDT on Ethereum, Solana, Base, and Polygon are table stakes. Many providers advertise off-ramp but only support it in a handful of countries; verify before building the withdrawal flow.
Comparison table
| Provider | Pricing | Coverage | Developer experience | Best for |
|---|---|---|---|---|
| MoonPay | 1% to 4.5% card, 1% ACH | 160+ countries, 30+ fiat | Widget + REST API, solid docs | Wallets needing global card coverage |
| Ramp Network | 0.49% to 2.9% | 150+ countries, strong EU/UK | Excellent SDKs, clean docs | EU and UK apps wanting low friction |
| Transak | 0.99% to 5.5% | 150+ countries, 75+ fiat | Widget + API, embeddable | Broad coverage including India (UPI) |
| Coinbase Onramp | 1% to 3.99% | US + 90 countries | Pay SDK, React components | US-first apps wanting a trusted brand |
| Kado | 1.5% flat off-ramp | 170+ countries | API-first, stablecoin-native | Stablecoin apps and cheap off-ramps |
| Stripe Crypto Onramp | 1.5% + Stripe fees | US + limited intl | Tight Stripe integration | Apps already on Stripe |
Top fiat on-ramp off-ramp providers
MoonPay
MoonPay is the default if you want one integration that works in most countries. It supports 160+ countries, 30+ fiat currencies, and methods spanning cards, ACH, SEPA, Apple Pay, Google Pay, and Pix. The widget handles KYC, AML, and fraud; the REST API gives deeper control if you hold the right licenses.
Fees sit between 1 and 4.5 percent depending on method and region. Off-ramp is live in most major markets and settles to cards or bank accounts. For developer setup, see our guide on how to use the MoonPay API.
Best for: consumer wallets needing broad global coverage with one vendor.
Ramp Network
Ramp is popular with EU and UK builders because it nails the parts others bungle: clean SDKs, honest fee disclosure, and fast KYC on SEPA. It covers 150+ countries but feels strongest in its home region, where Open Banking rails keep fees near 0.49 percent.
The hosted widget embeds in a React or vanilla JS app in minutes, and there is a native mobile SDK. Off-ramp is available in the EU, UK, and a growing list of other countries. Ramp pairs well with MetaMask-style wallets; see our guide on how to use the MetaMask API.
Best for: EU and UK apps wanting lowest friction on SEPA and Open Banking.
Transak
Transak covers 150+ countries, 75+ fiat currencies, and some of the widest local payment support in the category, including UPI in India and Pix in Brazil. The widget embeds into any web or mobile app; the API supports white-label flows with a partnership.
Fees run from 0.99 to 5.5 percent depending on method and corridor. KYC is handled end-to-end, and on-ramp plus off-ramp work in most live markets. It is often the answer for teams that need reach into emerging markets.
Best for: apps targeting India, Southeast Asia, and LATAM where local methods matter.
Coinbase Onramp (Pay SDK)
Coinbase Onramp uses the Pay SDK to let any Coinbase user fund a wallet in a few taps. For US users, that is a real conversion win; many already have a funded account. Non-US users can on-ramp via card or local methods in 90 countries.
The SDK ships React components and a hosted flow; KYC piggybacks on Coinbase’s existing user KYC when available. Off-ramp is newer and limited to specific countries. Trust matters here; a Coinbase-branded flow often converts better than unknown providers.
Best for: US-focused apps benefiting from Coinbase’s brand and user base.
Kado
Kado is the stablecoin specialist. It leans into USDC and USDT flows across Solana, Base, Polygon, and Ethereum, and its off-ramp fees are often the cheapest in the group at around 1.5 percent flat. Coverage spans 170+ countries, with bank transfers, cards, and SEPA.
The API is thoughtful for stablecoin apps; you can fund a wallet and later cash out to a bank account using the same account object. Docs are shorter than MoonPay’s but cleaner. If your product is stablecoin-native, Kado deserves a serious look.
Best for: stablecoin apps, neobanks, and payroll tools needing cheap off-ramps.
Stripe Crypto Onramp
Stripe Crypto Onramp is the shortest path if you are already on Stripe. It reuses your Stripe account, fraud stack, and dashboard, and charges 1.5 percent plus standard Stripe card fees. Coverage is US-first with growing international support.
The integration is small: a single embed, and Stripe handles KYC and settlement. Off-ramp is not the focus; this is primarily a funnel for getting fiat into USDC or ETH. If your team lives in the Stripe ecosystem, it is the fastest way to ship a crypto on-ramp.
Best for: Stripe-native US apps that want a familiar on-ramp without a new vendor.
How to choose
Start with your top three countries and the payment methods users pay with there. If that list includes UPI, Pix, or broad African card coverage, Transak or MoonPay win. EU-heavy points to Ramp. US-first with a Coinbase or Stripe footprint points to their SDKs. Stablecoin-native apps with off-ramp volume should shortlist Kado.
Then layer on pricing, off-ramp support, and hosted widget versus full API. Pilot two providers in parallel; a week of real conversion data beats any sales deck.
Testing fiat on-ramp APIs with Apidog
Before you pick a vendor, run the full on-ramp and off-ramp loop in sandbox. Apidog lets you import OpenAPI specs from MoonPay, Ramp, Transak, and others, then run authenticated requests against sandbox environments. You can script quote endpoints, simulate a KYC hand-off, and watch webhook payloads land in one workspace.
For this comparison, set up three environments: sandbox, staging, and production. Store each provider’s API key as an Apidog environment variable so you never hardcode secrets. Then chain requests: get a quote, create a transaction, poll status, confirm webhook, and trigger off-ramp. Once the flow is green in Apidog, porting it to your backend takes an afternoon. Download Apidog to start.
If you are also evaluating the wallet side of the stack, our rundown of the best crypto wallet APIs pairs well with this one.
FAQ
What is the difference between an on-ramp and an off-ramp?An on-ramp converts fiat (card, bank transfer, or local rail) into crypto and delivers it to a wallet. An off-ramp reverses this: it takes crypto and settles fiat back to a bank account or card.
Do I need a money transmitter license to use these APIs?Usually no. Most providers hold the licenses and handle compliance end-to-end. You act as a technology partner. If you want to hold customer funds or customize KYC deeply, you may need your own licensing; check each provider’s partner terms.
Which provider has the lowest fees?For cards in the EU, Ramp Network often comes in lowest at 0.49 to 2.9 percent. For off-ramps, Kado’s 1.5 percent flat fee is hard to beat. Stripe is cheap if you already use it. Compare against your corridor before deciding.
Can I use two on-ramp providers at once?Yes, and many production apps do. Route by country, method, or currency for best conversion and cost. For a companion guide, see our MoonPay API walkthrough.
How long does KYC take?Card flows with document upload finish in 2 to 5 minutes. Bank-linked KYC via Open Banking (common with Ramp) can complete in under 30 seconds for repeat users. Manual review on high-risk flags stretches to 24 to 48 hours.
Do these providers support stablecoins?Yes. USDC and USDT on Ethereum, Solana, Base, and Polygon are supported by every provider here. Kado and Stripe Crypto Onramp specialize in stablecoin flows; the others treat stablecoins as one option among many.
