Order matching has dropped in Shitcoin Swap in ~100 lines of Ruby. Most crypto exchanges reach for...
Order matching has dropped in Shitcoin Swap in ~100 lines of Ruby.
Most crypto exchanges reach for an existing matching engine or a Uniswap-style AMM. We wrote our own — not because we're smarter, but because the problem is simpler than people think, and understanding every line of your matching logic pays off if things go sideways at 3 AM.
The data model
Two tables, one idea:
Account — holds a balance of one asset. Each user gets one account per asset.
Integrating a crypto exchange API is where trading systems quietly break — auth signing, rate limits, WebSocket resync, and order…
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