Pay-per-call GBP/USD forex rate via x402 on Base, settled in USDC at $0.02/request.
What it does
This endpoint provides the current GBP/USD foreign exchange rate through a simple POST request, payable per call using the x402 protocol on the Base network. Payment is settled in USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or account registration are required — callers attach an X-PAYMENT header with a valid x402 payment proof and receive a JSON response with the exchange rate.
The endpoint is part of a broader suite of APIs hosted at lowpaymentfee.com, which includes finance, analytics, AI/ML, crypto, and utility endpoints, all priced uniformly at $0.02 per request. The platform advertises no rate limits and instant access. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show "Connect wallet"), so there is no detailed schema, example request/response, or error documentation available.
The x402 challenge was successfully captured, confirming the endpoint is live and accepting payment-gated requests. The output schema indicates the endpoint expects HTTP POST. The specific response format for the forex rate is not documented, so consumers should expect a JSON object containing the GBP/USD rate but will need to discover the exact shape empirically.
Capabilities
Use cases
- —Fetching the current GBP/USD exchange rate for trading bots or financial dashboards
- —Programmatic currency conversion in payment or invoicing applications
- —AI agents needing real-time forex data without API key management
- —Embedding live FX rates into spreadsheets or reports
Fit
Best for
- —Agents or apps needing on-demand GBP/USD rates without subscription commitments
- —Developers who prefer crypto-native pay-per-call billing over traditional API keys
- —Low-volume or bursty forex data consumers who want no minimums
Not for
- —High-frequency trading requiring sub-millisecond latency or bulk historical data
- —Users who need comprehensive multi-pair forex coverage from a single documented API
- —Anyone requiring detailed API documentation, SLAs, or guaranteed uptime
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/GBPUSD/rate \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC per call on Base). However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual response shape must be discovered empirically.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —Response schema for the forex rate endpoint is undocumented; consumers must discover the format empirically
- —No SLA, uptime guarantees, or data source attribution provided
- —The broader platform lists many endpoints but none appear to have detailed documentation
Citations
- —Endpoint returns 402 with x402 challenge, confirming it is live and payment-gatedhttps://lowpaymentfee.com/api/v1/forex/GBPUSD/rate
- —Price is $0.02 per request (maxAmountRequired 20000 in USDC with 6 decimals on Base)https://lowpaymentfee.com/api/v1/forex/GBPUSD/rate
- —Platform advertises no API keys, no rate limits, instant access, $0.02/request uniform pricinghttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/forex/GBPUSD/rate