GBP/CAD historical forex data via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides historical foreign exchange rate data for the GBP/CAD currency pair. It is hosted on lowpaymentfee.com, a platform offering a variety of pay-per-request APIs spanning finance, AI, data analytics, and infrastructure utilities. Access is gated via the x402 protocol — no API keys or accounts are required. Instead, each request is paid for individually using USDC on the Base network.
The endpoint accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The platform advertises uniform $0.02 pricing across all its endpoints, no rate limits, and no minimum commitments.
Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact request body format (e.g., date range parameters, granularity options) and the structure of the historical data response are unknown. The endpoint is confirmed live (402 challenge captured), but users will need to experiment to discover the accepted input format.
Capabilities
Use cases
- —Retrieving historical GBP/CAD exchange rates for backtesting trading strategies
- —Feeding forex history into financial models or dashboards
- —Comparing GBP/CAD rate trends over time for reporting
- —Agent-driven currency analysis without API key management
Fit
Best for
- —Developers needing quick, keyless access to GBP/CAD historical rates
- —AI agents that can settle x402 micropayments on Base
- —Projects requiring pay-as-you-go forex data with no subscription
Not for
- —Users needing real-time streaming forex quotes (this is historical data)
- —Applications requiring detailed API documentation or SLAs before integration
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/GBPCAD/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, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no example payloads. The exact input parameters and output format are entirely unknown, making this effectively a stub listing.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no content.
- —No OpenAPI or schema definition found; request body format and response structure are unknown.
- —The endpoint's specific capabilities (date ranges, granularity, data fields) cannot be verified from available material.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/forex/GBPCAD/history
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/forex/GBPCAD/history