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Xynaptic Fiat-USDC Rate
x402
Xynaptic Fiat-USDC Rate is a paid API for AI agents from api.xynaptic.io, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).
Returns the best fiat-to-USDC conversion rate across Base, Polygon, and Solana payment rails, including live Coinbase spot price, bid-ask spread, network fees, slippage hint, and a best-rail verdict.
Price / call$0.02
Success—
StatusUnknown
How this service works
Xynaptic Fiat-USDC Rate — best fiat↔USDC conversion rate per payment rail (Base, Polygon, Solana): live Coinbase spot EUR/USD with bid-ask spread, estimated network fees, slippage hint and best-rail verdict for agents settling in USDC. GET (?currency=EUR).
Output
Returns the live Coinbase spot EUR/USD price, bid-ask spread, estimated network fees per rail (Base, Polygon, Solana), a slippage hint, and a best-rail verdict recommending which network to use for the most cost-effective USDC settlement.
Example use cases
Cheapest rail for EUR settlement
“I need to settle a payment in USDC from euros — can you check live rates and tell me whether Base, Polygon, or Solana gives me the best deal including network fees and slippage?”
Pre-trade FX rate check for agent
“Before my agent executes a USDC payout, pull the current EUR to USDC conversion rate with the bid-ask spread and flag which payment rail has the lowest cost right now.”
Monitor EUR-USDC rate for arbitrage
“What's the current Coinbase spot EUR/USDC rate and how does the slippage and fee compare across Base, Polygon, and Solana — I want to know the best-rail verdict before I move funds.”
Technical details
Endpoint
GEThttps://api.xynaptic.io/v1/fiat-usdc-rate?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to programmatically determine the optimal payment rail and current cost to convert fiat (e.g. EUR) to USDC before executing an on-chain settlement. Preferred over generic FX APIs because it bundles cross-rail fee comparison and a concrete best-rail recommendation specifically for USDC stablecoin settlement on Base, Polygon, and Solana.
Side effects
- Unsupported currency code returns an error or empty result
- Coinbase spot feed unavailable causes stale or missing rate
- Network fee estimation may lag real-time congestion
- Missing or invalid query parameter returns 400-level error
- Rate limiting may apply if called too frequently
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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