Launch a crypto exchanger with one API — how EIDEX Merchant API works
Building a crypto exchanger? Here’s what our new Merchant API can save you from doing yourself
Hey Product Hunt community 👋
We just published a deep dive on our Crypto Merchant API — the backend layer we built for teams launching crypto exchangers, P2P services, payment gateways, or trading bots.
The idea is simple: instead of spinning up your own liquidity, running blockchain nodes, and rebuilding order matching from scratch, you plug into one HTTP API and focus on your product.
What the Merchant API handles:
🔹 Quotes & orders — real-time pricing across supported pairs (BTC, ETH, USDT, SOL, XRP + 15 networks), MARKET and LIMIT execution
🔹 Deposit addresses from a shared pool — reserve an address by nonce, release it back when done. Same nonce returns the same address, so retries don’t break your logic
🔹 HMAC-signed webhooks — real-time deposit.confirmed and withdraw.completed events, no polling needed
🔹 Granular permissions — API keys with READONLY / TRADING / WITHDRAW scopes. A stolen READONLY key can’t drain funds
🔹 IP whitelist (CIDR) — configurable per key
🔹 Idempotency keys — required for POST /order and POST /withdraw, makes retries safe on money operations
🔹 Rate limits — 60 req/min per key, up to 10 keys per account
A typical exchange flow is just 6 API calls:
GET /tickers — pull rates for the storefrontPOST /address/reserve — reserve a deposit address by nonceClient sends funds → you receive the deposit.confirmed webhookPOST /order — execute with Idempotency-KeyGET /order/{id} — track statusPOST /withdraw → withdraw.completed webhook → POST /address/releaseIntegration scenarios we’ve documented:
• Classic web exchanger — your storefront, our settlement layer
• Telegram bot — same logic, no frontend needed
• White-label exchanger — your brand, our infra hidden behind it
Full docs, OpenAPI spec for Postman/Insomnia, and quickstart → https://eidex.io/blog/api-dlya-obmennika-kriptovalyut
Discussion prompt for the community:
For those of you who’ve built (or considered building) a crypto product — what’s usually the biggest bottleneck? Liquidity access, compliance, or infrastructure?
And for those who’ve integrated third-party APIs: what would actually make you choose a merchant API over building in-house? Curious to hear real trade-offs from builders here.
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