Observed Signal · Apr 23, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Integrating MoonPay API for Fiat On‑Ramp/Off‑Ramp
This developer guide explains end-to-end integration of MoonPay’s fiat-to-crypto and crypto-to-fiat gateway. It describes two integration paths (MoonPay-hosted Ramps widget/SDK for fastest launch or direct REST API for full control), account setup (sandbox vs production), creating HMAC-SHA256-signed widget URLs, verifying HMAC-signed webhooks, core endpoints (currencies, quotes, transactions, webhooks), NFT payment support, and off-ramp flows requiring a refundWalletAddress. The article documents pricing (card fees 3.5%–4.5% with a $3.99 minimum; bank transfers ~1%–1.9%; network fees passed through), rate limits (~100 requests/min per API key), common error codes, and testing recommendations using Apidog. It emphasizes trusting signed webhooks for transaction state and using sandbox for full end-to-end testing before production.
Practical integration guidance for a widely used payment/on‑ramp provider; relevant to platforms adding fiat-crypto flows and commerce capabilities but not industry-shifting.
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Key Takeaways & Evidence Grounding
- MoonPay is a licensed fiat-to-crypto and crypto-to-fiat payment gateway used in 160+ countries and integrated into wallets/marketplaces such as MetaMask, Trust Wallet and OpenSea.
- Two integration options: MoonPay Ramps SDK/widget (hosted UI) or direct REST API; all widget URLs must be signed with HMAC-SHA256 using the secret key in production.
- MoonPay supports 110+ cryptocurrencies across 40+ networks (Ethereum, Solana, Bitcoin, Polygon, Base, Arbitrum) and supports NFT payments.
- Pricing example: card processing fees ~3.5%–4.5% (minimum $3.99); bank transfers (ACH/SEPA/open banking) ~1%–1.9%; network fees are passed through.
- Sandbox uses same endpoints as production for testing; common errors include 400 invalid_signature, 403 geo_restricted, 422 transaction_limit_exceeded and 429 rate_limited (~100 req/min).
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