Historical EUR/CHF forex data via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides historical exchange rate data for the EUR/CHF currency pair. It is part of the lowpaymentfee.com platform, which offers a variety of pay-per-request APIs spanning finance, analytics, AI, and utilities. The endpoint is accessed via HTTP POST and is gated by the x402 payment protocol, settling in USDC on the Base network.
Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is paid individually via the X-PAYMENT header. The x402 challenge was confirmed live, returning a standard 402 response with payment parameters including the USDC contract address on Base (0x8335…2913) and a 300-second payment timeout.
The specific response schema for the history endpoint is not documented in the crawled material. The site's docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no further technical detail. As a result, the exact request body format (e.g., date range parameters) and response structure (e.g., OHLC candles vs. daily close prices) must be discovered by making a paid request. The endpoint is clearly part of the Finance & Web3 category on the platform, alongside price feeds, exchange rates, token quotes, and gas estimates.
Capabilities
Use cases
- —Retrieving historical EUR/CHF exchange rates for backtesting trading strategies
- —Feeding forex history into financial models or risk calculations
- —Building dashboards that display EUR/CHF trends over time
- —Programmatic access to FX data without API key registration
Fit
Best for
- —Agents or bots that need on-demand forex history without signup
- —Low-volume or sporadic forex data needs where per-request pricing is economical
- —x402-native applications settling micropayments on Base
Not for
- —High-frequency trading requiring sub-second tick data (no documented low-latency guarantees)
- —Users needing bulk historical data downloads across many currency pairs at once (per-request cost adds up)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/EURCHF/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request parameters, no example responses, and the docs/pricing/API pages are all blank beyond a wallet-connect prompt. The actual data format and capabilities of the history endpoint are entirely unknown.
Warnings
- —No request or response schema documented — input parameters (date range, granularity, etc.) are unknown
- —Docs, pricing, and API pages on the site render only 'Connect wallet' with no technical content
- —The specific endpoint /api/v1/forex/EURCHF/history is not listed on the site's landing page among advertised APIs, raising questions about its completeness or availability
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/forex/EURCHF/history
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/EURCHF/history
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com