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Synapse Exchange Rate API
x402
Synapse Exchange Rate API is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Returns the current exchange rate between two currencies (e.g. USD to EUR) via a pay-per-call x402 endpoint.
Price / call$0.001
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
A JSON object containing the source currency code ('from'), target currency code ('to'), and the current exchange rate as a decimal number (e.g. {"from":"USD","to":"EUR","rate":0.92}).
Example use cases
Travel budget currency conversion
“I'm planning a trip to Japan — what's the current exchange rate from USD to JPY so I can figure out my budget?”
E-commerce multi-currency pricing
“My store lists prices in GBP but I need to show EUR prices too — can you look up the current GBP to EUR exchange rate?”
Invoice reconciliation in foreign currency
“I received an invoice in CHF and need to pay in USD — what's the current CHF to USD exchange rate?”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/exchange-rate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, keyless, pay-per-call currency exchange rate lookup without setting up an account or API key — ideal for AI agents making occasional FX lookups using x402 micropayments on Base. Best for single currency-pair spot rate queries rather than bulk historical data.
Side effects
- Unsupported or invalid currency code returns an error
- Missing 'from' or 'to' query parameters results in a 400-level error
- Payment not completed or insufficient USDC balance returns 402 Payment Required
- Network or upstream data provider unavailability returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "EUR",
"from": "USD",
"rate": 0.92
}
}Tags
x402
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