Historical USD/CAD forex data via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides historical exchange rate data for the USD/CAD currency pair. It is hosted on lowpaymentfee.com, a platform offering a variety of pay-per-request APIs spanning data analytics, AI/ML, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request with no API keys, rate limits, or subscriptions required.
The specific endpoint at `/api/v1/forex/USDCAD/history` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network. The asset contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` is Base-native USDC.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of accepted parameters or response format. The endpoint is confirmed live via the 402 challenge, but the exact request body structure and historical data granularity are unknown.
Capabilities
Use cases
- —Retrieving historical USD/CAD exchange rates for financial analysis
- —Backtesting forex trading strategies with historical currency data
- —Building dashboards that display USD/CAD rate trends over time
- —Feeding historical FX data into pricing or invoicing systems
Fit
Best for
- —Agents or apps needing on-demand historical USD/CAD data without API key management
- —Micropayment-native workflows that settle in USDC on Base
- —Low-volume or sporadic forex data lookups where per-request pricing is economical
Not for
- —High-frequency trading requiring sub-second streaming forex feeds
- —Users who need comprehensive multi-pair forex coverage from a single documented API
- —Anyone requiring detailed API documentation or SLA guarantees before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/USDCAD/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request parameters or response format, and no examples. The docs/pricing/README pages are all empty beyond a wallet connect prompt. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages render only 'Connect wallet' with no content
- —No OpenAPI or JSON schema describing request parameters or response structure
- —Request body format and accepted query parameters are entirely unknown
- —The endpoint path suggests forex history but the platform's landing page does not list this specific endpoint among its advertised APIs, raising questions about its status
Citations
- —The endpoint returns a 402 challenge requesting 20,000 base units of USDC ($0.02) on Base networkhttps://lowpaymentfee.com/api/v1/forex/USDCAD/history
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/USDCAD/history
- —Docs, pricing, API, and README pages show only a 'Connect wallet' prompt with no further contenthttps://lowpaymentfee.com/docs