exchangerate.dev
All 144 currencies update about every 60 seconds on trading days, 15 minutes late on Free. Every response includes source and market_session fields. MCP is included on every plan.
From $0 · free tier, 5,000 calls/mo, no card
OANDA
Paid exchange-rate API plans with daily averages and 3–5 second spot data on eligible tiers. There is a seven-day trial, but no permanent free tier.
Lite $450 or $4,850 · 7-day trial
Where exchangerate.dev wins
exchangerate.dev includes 5,000 free calls per month, 30 days of daily history, and MCP on every plan. All 144 currencies update about every 60 seconds on trading days, 15 minutes late on Free. Every response includes source and market_session fields. No credit card is required.
Where OANDA leads
OANDA leads when a treasury or finance team needs its broader business-data catalog or 3–5 second spot updates on an eligible plan. exchangerate.dev is the lower-cost self-serve option: an anonymous first call, a permanent free tier, source + market_session on every response, and MCP on every plan.
Verdict
Choose exchangerate.dev when intraday freshness, per-value provenance, MCP-native access, and free-tier headroom matter. Keep OANDA if you need its business-data catalog or 3–5 second spot updates on an eligible plan.