Real-time EUR/USD forex exchange rate via x402 micropayment on Base network.
What it does
This endpoint returns the current EUR/USD foreign exchange rate, accessible through the x402 payment protocol on the Base network. Each request costs $0.02 in USDC (USD Coin), settled on-chain with no API keys, no rate limits, and no upfront commitments.
The endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, spanning finance, analytics, AI/ML, crypto, and utility categories. All endpoints on the platform share the same $0.02/request pricing model and x402 payment flow. The specific endpoint at `/api/v1/forex/EURUSD/rate` serves forex market data for the EUR/USD currency pair.
Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of the response format beyond the x402 challenge's declared `application/json` MIME type. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual response structure after payment is unknown.
Capabilities
Use cases
- —Fetching the current EUR/USD exchange rate for trading bots or financial dashboards
- —Programmatic currency conversion in payment or invoicing applications
- —Agent-driven forex data retrieval without API key management
- —On-demand FX rate lookups for DeFi or cross-border payment workflows
Fit
Best for
- —Agents or bots that need on-demand EUR/USD rates without subscription overhead
- —Developers wanting keyless, pay-per-call forex data on Base
- —Low-volume or sporadic forex rate lookups at $0.02 per call
Not for
- —High-frequency trading requiring sub-millisecond latency or bulk rate feeds
- —Users who need historical forex data or OHLCV candles (not indicated as supported)
- —Anyone without a Base-network USDC wallet for payment
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/EURUSD/rate
# Returns 402 with x402 challenge. Include X-PAYMENT header with valid payment proof to receive the EUR/USD rate.Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no example responses, no description of the response schema. The site's docs/pricing/API pages all render only a wallet-connect prompt. Pricing is clear ($0.02/request in USDC on Base), but the actual data returned after payment is unknown.
Warnings
- —No documentation available beyond the landing page listing — docs, API, pricing, and README pages are all empty (wallet-connect only).
- —No OpenAPI schema or example response provided; the actual response format after payment is unknown.
- —The specific /api/v1/forex/EURUSD/rate path is not listed on the landing page (the site lists /api/v1/finance/rates instead), so this may be an unlisted or alternate endpoint.
- —Cannot verify data source, update frequency, or accuracy of the forex rate returned.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/forex/EURUSD/rate
- —All endpoints on the platform cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base (6 decimals), so 20000 base units = $0.02https://lowpaymentfee.com