SERVICE

fiat-usdc-rate

Xynaptic Fiat-USDC Rate — best fiat↔USDC conversion rate per payment rail (Base, Polygon, Solana): Coinbase spot, spread, network fees, best-rail verdict. GET ?currency=EUR.

$0.02 per call · /v1/fiat-usdc-rate

Call it

curl -s https://api.xynaptic.io/v1/fiat-usdc-rate \
  -H "Accept: application/json"

# -> 402 Payment Required (x402 challenge: price, payTo, networks)
# -> sign the payment, retry with PAYMENT-SIGNATURE -> 200

What you get back

{
  "service": "fiat-usdc-rate",
  "currency": "EUR",
  "coinbase_spot": 0.8894,
  "best_rail": "Base",
  "rail_fees_usd": 0.01,
  "summary": "1 USDC = 0.8894 EUR (spread 0.01%) — best rail: Base, fees ~0.01 USD."
}