Pay-per-call GBP/USD forex rate endpoint settled in USDC on Base via x402.
What it does
This endpoint at lowpaymentfee.com provides GBP/USD foreign exchange rate data via a simple POST request. It uses the x402 payment protocol, requiring a per-call micropayment of $0.02 in USDC on the Base network. No API keys, accounts, or rate limits are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive a JSON response.
The endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per request. The specific forex endpoint serves the GBP/USD currency pair, though the exact response schema (bid/ask, mid-rate, timestamp, etc.) is not documented in the available materials.
The x402 challenge is live and well-formed: it advertises USDC (contract 0x8335…2913) on Base mainnet with a maxAmountRequired of 20000 base units (i.e., $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds. No OpenAPI spec, detailed documentation, or example responses were found in the crawl — the docs, pricing, and API pages all rendered only a wallet-connect prompt with no substantive content.
Capabilities
Use cases
- —Fetching the current GBP/USD exchange rate for trading bots or financial dashboards
- —Programmatic currency conversion in payment or invoicing applications
- —Agent-driven forex data retrieval without pre-registration or API keys
- —Embedding real-time FX data into smart-contract or DeFi workflows
Fit
Best for
- —Developers needing quick, keyless access to GBP/USD rates
- —AI agents that can settle micropayments on Base
- —Applications requiring pay-as-you-go forex data with no subscription
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 unable to settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/GBPUSD \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs/pricing pages are empty wallet-connect stubs. The actual data returned by this forex endpoint is entirely unknown, making this effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — response format for GBP/USD data is unknown
- —Docs, pricing, and API pages render only a wallet-connect prompt with no substantive content
- —No example requests or responses could be sourced; callers must discover the response format empirically
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/forex/GBPUSD
- —All APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/GBPUSD