Real-time CHF/JPY forex exchange rate via x402 micropayment on Base network.
What it does
This endpoint provides the current CHF/JPY (Swiss Franc to Japanese Yen) foreign exchange rate, accessible through the x402 payment protocol on the Base network. Each request costs $0.02 in USDC (20,000 base units with 6 decimals), settled on-chain to the provider's wallet. No API keys or rate limits are required — payment is handled per-request via the X-PAYMENT header.
The endpoint is part of a broader suite of APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per call. The forex rate endpoint specifically lives under the finance category and returns JSON. The x402 challenge confirms the endpoint is live, accepting POST requests, and settling payments in USDC (contract 0x8335…) on Base.
Documentation on the site is minimal — the docs, pricing, and API pages all render only a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The endpoint's behavior must be inferred from its URL path and the x402 challenge metadata.
Capabilities
Use cases
- —Fetching the current CHF/JPY exchange rate for trading bots or portfolio dashboards
- —Programmatic currency conversion in financial applications
- —AI agents needing real-time forex data without API key management
- —Micropayment-gated access to FX data for pay-per-use workflows
Fit
Best for
- —Agents or apps needing on-demand CHF/JPY rates without subscription commitments
- —Developers who prefer crypto-native per-call payment over traditional API keys
- —Low-volume or bursty forex data consumers who want no minimums
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk rate feeds
- —Users who need historical forex time-series data (no evidence this endpoint provides it)
- —Consumers without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/CHFJPY/rate \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no example payloads, and the site's docs pages are empty wallet-connect stubs. The endpoint's actual behavior is inferred entirely from its URL path.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —Docs, pricing, and API pages on the site render only a wallet-connect prompt with no technical content
- —No example request or response payloads could be found
- —The broader lowpaymentfee.com platform lists many endpoints but provides no detail on any of them
Citations
- —The endpoint returns HTTP 402 with an x402 challenge advertising USDC payment on Base network at 20,000 base units (=$0.02)https://lowpaymentfee.com/api/v1/forex/CHFJPY/rate
- —The site advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/CHFJPY/rate