What is a crypto onramp API?

A crypto onramp API is a service that lets developers embed fiat-to-crypto purchasing into their applications. Users can buy Bitcoin or other cryptocurrencies with a credit card, bank transfer, or other payment method without leaving the app. The API handles payment processing, compliance, and delivery.

How long does onramp API integration take?

Integration time varies by provider and approach. Hosted widgets can be embedded in a few hours. API-first integrations typically take a few days to a week, depending on the complexity of the flow and how much UI customization you need. Orchestra's Quote/Submit pattern is designed for minimal integration time.

What are typical onramp fees?

Hosted widget providers like MoonPay and Transak charge 1.5% to 3.5% per transaction, often with additional network fees. API-first providers tend to be cheaper. Flashnet Orchestra charges 0.40% for Bitcoin onramps and 0.20% for USDB, with no hidden markups.

Can users pay with card or bank transfer?

Most onramp APIs support both credit/debit cards and bank transfers. Card payments settle faster (minutes) but cost more in processing fees. Bank transfers (ACH, SEPA) are cheaper but take longer to settle. Some providers also support Apple Pay, Google Pay, and local payment methods.

Does using an onramp API require KYC?

Most onramp providers require some level of identity verification to comply with money transmission regulations. The extent varies: some allow small purchases with just an email, while larger amounts require full ID verification. KYC requirements depend on the provider, the user's jurisdiction, and the transaction amount.

What is a crypto onramp API?

A crypto onramp API is a service that lets developers embed fiat-to-crypto purchasing into their applications. Users can buy Bitcoin or other cryptocurrencies with a credit card, bank transfer, or other payment method without leaving the app. The API handles payment processing, compliance, and delivery.

How long does onramp API integration take?

Integration time varies by provider and approach. Hosted widgets can be embedded in a few hours. API-first integrations typically take a few days to a week, depending on the complexity of the flow and how much UI customization you need. Orchestra's Quote/Submit pattern is designed for minimal integration time.

What are typical onramp fees?

Hosted widget providers like MoonPay and Transak charge 1.5% to 3.5% per transaction, often with additional network fees. API-first providers tend to be cheaper. Flashnet Orchestra charges 0.40% for Bitcoin onramps and 0.20% for USDB, with no hidden markups.

Can users pay with card or bank transfer?

Most onramp APIs support both credit/debit cards and bank transfers. Card payments settle faster (minutes) but cost more in processing fees. Bank transfers (ACH, SEPA) are cheaper but take longer to settle. Some providers also support Apple Pay, Google Pay, and local payment methods.

Does using an onramp API require KYC?

Most onramp providers require some level of identity verification to comply with money transmission regulations. The extent varies: some allow small purchases with just an email, while larger amounts require full ID verification. KYC requirements depend on the provider, the user's jurisdiction, and the transaction amount.

Bitcoin Onramp API: How to Add Bitcoin Buying to Any App

A bitcoin onramp API lets developers add fiat-to-Bitcoin purchasing directly into their applications. This guide covers how onramp APIs work, what integration looks like, and how to choose a provider based on fees, coverage, and developer experience.

March 29, 2026

What Is a Bitcoin Onramp API?

A bitcoin onramp API is a programmatic interface that lets applications convert fiat currency (dollars, euros, pounds) into Bitcoin. Instead of sending users to an external exchange, the onramp API embeds the purchasing flow directly into the app. The user enters a payment method, the API handles identity verification and payment processing, and Bitcoin arrives in the user's wallet.

Onramp APIs exist because most people still hold their money in fiat. Every Bitcoin wallet, DeFi protocol, and crypto application needs a way to let users get Bitcoin in the first place. Without an onramp, users have to buy Bitcoin on a separate exchange and then transfer it — a multi-step process that causes significant drop-off.

The market for onramp APIs has grown as crypto applications move beyond early adopters. Providers like MoonPay, Transak, and Ramp Network offer hosted widget solutions. These work but come with limitations: high fees (typically 1.5% to 3.5%), limited customization, and redirect flows that break the user experience. API-first approaches give developers more control over the flow while keeping fees lower.

How Bitcoin Onramp Integration Works

There are two main approaches to onramp integration: hosted widgets and API-first flows. Hosted widgets are the simplest — you embed an iframe or redirect users to a third-party checkout page. The provider handles the entire purchase flow including KYC, payment collection, and delivery. The downside is limited control over the user experience and higher fees to cover the provider's overhead.

API-first onramps give developers direct access to the underlying infrastructure. The typical flow is: request a quote with the source currency, destination asset, and amount; present the quote to the user; collect payment details; submit the transaction. The API handles settlement and delivers Bitcoin to the specified address. This approach allows full UI customization and usually lower fees.

Key factors when evaluating onramp APIs include fee structure (flat fee vs percentage vs spread), supported payment methods (card, bank transfer, Apple Pay), geographic coverage, settlement speed, and KYC requirements. Some providers require full identity verification for every purchase, while others allow smaller transactions with lighter verification. Settlement speed varies from minutes to days depending on the payment method and provider.

How to Add Bitcoin Buying with Orchestra

Flashnet Orchestra provides a bitcoin onramp API as part of its orchestration layer. Rather than integrating a standalone onramp provider, developers get onramping bundled with cross-chain bridging, swaps, and offramps through a single API. This means one integration covers the full lifecycle of moving value into, within, and out of Bitcoin.

Orchestra's onramp supports card and bank transfer payments, with Bitcoin delivered to any supported network — Spark, Lightning, Bitcoin L1, Base, Solana, or Ethereum among others. ZeroConf enables instant crediting of Bitcoin deposits, so users don't wait for block confirmations. Fees start at 0.40% for Bitcoin and 0.20% for USDB, well below the 1.5% to 3.5% charged by hosted widget providers like MoonPay.

Integration follows the Quote/Submit pattern: request a quote, get a firm price, submit the transaction. For simpler use cases, Pay Links generate a hosted checkout page with a single API call — no frontend work required. Accumulation Addresses provide a persistent address that automatically converts incoming fiat payments to Bitcoin or USDB. To compare costs against other providers, use the Fee Comparison Calculator.

Frequently Asked Questions

What Is Bitcoin Orchestration?Bitcoin Offramp API: Convert BTC to Fiat Programmatically Crypto Onramp vs Offramp: How Fiat-to-Bitcoin Rails Work

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