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Notes from the gateway
How we build keys, limits and routing, what we got wrong on the way, and what our customers run in production.
Rate limiting at the edge without lying to your usersFixed windows, token buckets and regional counters all trade accuracy for speed. Here is how we pick the trade, and why the 429 matters as much as the limit.Tidewell replaced four vendors with one gateway and stopped arguing with customers about invoicesA port and freight data API serving 640 logistics companies moved 140 endpoints onto Halyard in nine days.Vantra gives every AI agent its own key and a spend cap it cannot talk its way pastAn agent platform issuing 180,000 live keys uses per-key limits to stop runaway loops before they reach a customer's card.
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Engineering notes on keys, limits and gateways. One email when something ships, nothing else.