Historical USD/NOK forex data via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides historical exchange rate data for the USD/NOK currency pair. It is part of the lowpaymentfee.com platform, which offers a variety of pay-per-request APIs spanning finance, analytics, AI, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per call.
The specific endpoint at `/api/v1/forex/USDNOK/history` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimal places. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.
Documentation is extremely sparse. The platform's docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the history endpoint accepts or returns. The endpoint name and URL path suggest it returns historical forex data for USD/NOK, but the exact request parameters (date range, granularity, etc.) and response shape are unknown.
Capabilities
Use cases
- —Retrieving historical USD/NOK exchange rates for financial analysis
- —Backtesting currency trading strategies involving the Norwegian krone
- —Feeding forex data into dashboards or reporting tools without API key management
- —Agent-driven micropayment access to forex data on Base network
Fit
Best for
- —Developers needing quick, keyless access to USD/NOK historical rates
- —AI agents that can settle x402 payments in USDC on Base
- —Low-volume or sporadic forex data consumers who prefer pay-per-call pricing
Not for
- —High-frequency trading requiring sub-second latency and guaranteed SLAs
- —Users who need comprehensive multi-pair forex coverage from a single documented API
- —Anyone requiring detailed API documentation or schema guarantees before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/USDNOK/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty stubs. The actual request parameters and response format are entirely unknown, making integration speculative.
Warnings
- —No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content
- —No OpenAPI or JSON schema describing request parameters or response format
- —Request body structure and supported query parameters (date range, granularity, etc.) are unknown
- —Response shape is completely undocumented — no example responses available
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/forex/USDNOK/history
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/USDNOK/history