Pay-per-call USD/CAD forex rate via x402 on Base, settled in USDC at $0.02/request.
What it does
This endpoint provides the current USD/CAD foreign exchange rate through a simple POST request, paid per call using the x402 protocol. It is part of a broader suite of APIs hosted at lowpaymentfee.com covering finance, analytics, AI/ML, crypto, and utility services.
The endpoint is live and returns a standard x402 payment challenge (HTTP 402) requiring an X-PAYMENT header with a Base-network USDC payment. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on the Base L2 network, using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The payment scheme is "exact" with a timeout of 300 seconds.
No API keys or rate limits are advertised. The response MIME type is application/json. Documentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all appear to require a wallet connection and yield no additional content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available, so the exact shape of the returned forex data must be inferred.
Capabilities
Use cases
- —Fetching the current USD/CAD exchange rate for financial applications
- —Automating currency conversion calculations in trading bots
- —Embedding live forex data into dashboards or reports
- —Agent-driven forex lookups without API key management
- —Pay-as-you-go FX data for low-volume or sporadic usage
Fit
Best for
- —Developers needing simple, keyless forex data access
- —AI agents that can settle x402 micropayments on Base
- —Low-volume or on-demand USD/CAD rate lookups
Not for
- —High-frequency trading requiring sub-second latency and bulk pricing
- —Users who need historical forex time-series data (not evidenced here)
- —Applications that cannot settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/USDCAD/rate \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"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 spec, no documented request/response schema, no example payloads, and the docs/pricing pages are gated behind wallet connection, leaving the actual response format unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Response payload structure is unknown — no examples found in crawl
- —All documentation pages (/docs, /pricing, /api, /README) appear to require wallet connection and returned no useful content
- —The broader lowpaymentfee.com platform lists many endpoints across diverse categories (AI, analytics, finance, utils) — quality and reliability of each is unverified
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/forex/USDCAD/rate
- —Price is $0.02 per request (20000 base units of USDC with 6 decimals)https://lowpaymentfee.com
- —No API keys, no rate limits, instant access advertisedhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/forex/USDCAD/rate