USD/NOK forex exchange rate via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint returns the current USD/NOK foreign exchange rate, payable per-request via the x402 protocol on the Base network. It is part of a broader suite of APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance, crypto, and utility endpoints — all priced at $0.02 per call using USDC on Base.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 "exact" scheme, settling in USDC (contract 0x8335…2913) on Base. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys or rate limits are advertised; access is gated solely by micropayment. The timeout for payment settlement is 300 seconds.
Documentation beyond the landing page is 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 example request/response, and no description of the response schema. The endpoint is confirmed live (returns 402 with a valid x402 challenge).
Capabilities
Use cases
- —Fetching the current USD/NOK exchange rate for financial applications
- —Integrating real-time forex data into trading bots or dashboards
- —Programmatic currency conversion for invoicing or pricing in NOK
- —Agent-driven forex lookups without API key management
Fit
Best for
- —Developers needing on-demand USD/NOK rates without subscription commitments
- —AI agents that can pay per-call via x402 on Base
- —Applications requiring low-cost, keyless forex data access
Not for
- —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
- —Users who need historical forex time-series data (only current rate advertised)
- —Consumers without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/USDNOK/rate \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages beyond the landing page are empty wallet-connect stubs. The listing is functional but minimally documented.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —All doc/pricing/API pages render only 'Connect wallet' with no technical content
- —No example request or response bodies are available to verify output format
- —The specific forex endpoint /api/v1/forex/USDNOK/rate is not listed on the landing page among the advertised APIs, though similar finance endpoints are
Citations
- —The endpoint returns HTTP 402 with a valid x402 challenge confirming it is livehttps://lowpaymentfee.com/api/v1/forex/USDNOK/rate
- —Price is $0.02 per request (maxAmountRequired 20000 base units, USDC with 6 decimals)https://lowpaymentfee.com/api/v1/forex/USDNOK/rate
- —Payment settles in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/forex/USDNOK/rate
- —All APIs on the platform are priced at $0.02 per request with no API keys or rate limitshttps://lowpaymentfee.com