[Payment rails: fee + speed comparison] Cheapest and fastest payment rail right now for a USD amount (?amount=100): Base USDC (live gas x ETH/USD, ~2s), XRPL RLUSD/XRP (live fee x XRP/USD, ~3-5s), Tempo and Circle Arc (live gas, USD fees, ~1s), card (static 2.9% + $0.30, days). Fee USD/%, settlement time, sources, agent protocols per rail, recommended pick. Dead sources marked unavailable. 60s cache. $0.002 USDC. Signal only.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.002000 USDC | 0xB452...CaBd |