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fastapi.online — Currency Exchange Rate Lookup
x402
fastapi.online — Currency Exchange Rate Lookup is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Retrieves currency exchange rates or performs currency conversion calculations via a self-hosted inference endpoint
Price / call$0.001
Success—
StatusUnknown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns the current exchange rate between the specified currency pair and optionally the converted amount for a given input value. Response includes rate data sourced from self-hosted models, returned as JSON.
Example use cases
Travel budget currency conversion
“I'm heading to Japan next month — can you tell me the current USD to JPY exchange rate and convert $1,500 for me so I know what to expect?”
Business invoice foreign currency check
“I need to pay a supplier 3,000 euros — what's the current EUR to USD exchange rate so I can figure out how much that'll cost me in dollars?”
Forex rate monitoring for trading
“What's the live exchange rate between GBP and CHF right now? I'm tracking this pair for a potential trade.”
Technical details
Endpoint
POSThttps://api.fastapi.online/exchanges?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, no-signup currency exchange rate lookup that accepts crypto micropayments via x402 protocol. Useful for agents that need occasional FX lookups without committing to a subscription API key, or when operating in a crypto-native payment context.
Side effects
- Invalid or unsupported currency code returns an error response
- Missing required body fields results in 422 validation error
- Payment not included or insufficient USDC triggers 402 Payment Required
- Unsupported currency pair may return empty or null rate data
- Transient self-hosted model downtime may cause 500 errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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