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Rust

Exchange API

USD FX API. Serves today's snapshot from MongoDB; on a miss it hits Fixer (Apilayer), stores it, and returns it.

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What it solves

Fixer cannot sit on every request (quota and latency). GET / looks up today's USD rates in Mongo; on a miss it calls Fixer and persists. If Fixer fails, it returns the latest snapshot. An external scheduler (cron-job.org) hits /check daily to warm the cache.

Stack

  • Rust
  • Axum
  • MongoDB
  • Fly.io
  • GitHub Actions
  • Fixer API

Infra

Rust + Axum (Tokio, reqwest). MongoDB. Fly.io in GRU, 256 MB, machines that auto-stop. Deploy via GitHub Actions and external cron (cron-job.org) against /check. Base always USD.