USD/NOK forex rate via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint provides the USD/NOK foreign exchange rate through an x402-compatible pay-per-call API hosted at lowpaymentfee.com. Each request costs $0.02, paid in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to a POST request and receive a JSON response with the current exchange rate.
The endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning finance, data analytics, AI/ML inference, crypto market data, and utility services, all priced uniformly at $0.02 per request. The forex endpoint specifically serves the USD to Norwegian Krone (NOK) currency pair. The x402 challenge confirms the endpoint is live, accepting payments to address 0x1A2B...85F3 using USDC (contract 0x8335...2913) on Base.
Documentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The output schema in the x402 challenge indicates a POST method with discoverable=true and JSON mime type, but the actual response structure must be inferred from the endpoint name (likely a rate or quote object).
Capabilities
Use cases
- —Fetching the current USD/NOK exchange rate for financial applications
- —Integrating real-time forex data into trading bots or dashboards
- —Currency conversion calculations involving Norwegian Krone
- —Agent-driven forex lookups without needing API key registration
Fit
Best for
- —Developers needing quick, keyless access to USD/NOK rates
- —AI agents that can pay per call via x402 on Base
- —Applications requiring low-cost, on-demand forex data
Not for
- —Bulk historical forex data retrieval (no evidence of historical endpoints)
- —Users who cannot pay in USDC on the Base network
- —Applications needing comprehensive multi-pair forex coverage from a single call
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/USDNOK \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages return only a wallet-connect prompt. The actual response format is unknown.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content
- —No OpenAPI or schema specification found
- —Response format for the forex endpoint is entirely undocumented and must be guessed
- —The broader platform lists many endpoint categories but none have documented schemas
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/forex/USDNOK
- —Price is $0.02 per request (maxAmountRequired=20000, USDC 6 decimals)https://lowpaymentfee.com
- —No API keys, no rate limits, instant access advertisedhttps://lowpaymentfee.com
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/forex/USDNOK
- —Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'https://lowpaymentfee.com/docs