Historical CHF/JPY forex data via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides historical exchange rate data for the CHF/JPY (Swiss Franc to Japanese Yen) currency pair. It is part of the lowpaymentfee.com platform, which offers a suite of data, AI, finance, and utility APIs all gated behind x402 micropayments on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a USDC payment on Base. The maximum amount required per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.
The platform advertises a broad catalog of endpoints spanning analytics, AI/ML inference, finance/crypto market data, and utility services, all at the same $0.02 per-request price point. Documentation beyond the landing page is sparse; the docs, API, pricing, and README pages all resolve to a minimal "Connect wallet" prompt with no additional technical detail. No OpenAPI schema or request/response examples are published, so the exact request body format and response structure for this forex history endpoint must be inferred or discovered experimentally.
Capabilities
Use cases
- —Retrieving historical CHF/JPY exchange rates for backtesting trading strategies
- —Feeding forex history into financial models or dashboards
- —Comparing Swiss Franc to Japanese Yen trends over time
- —Automated agents purchasing FX data on-demand without API keys
Fit
Best for
- —Developers needing on-demand forex history without subscription overhead
- —AI agents that can pay per-call via x402 on Base
- —Low-volume or sporadic forex data consumers who want pay-as-you-go pricing
Not for
- —High-frequency trading requiring sub-second latency and streaming data
- —Users who need comprehensive multi-pair forex coverage from a single well-documented API
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/CHFJPY/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no published OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages are all empty wallet-connect stubs. The exact request format and response shape are unknown.
Warnings
- —No documentation available beyond the landing page; docs, API, pricing, and README pages all show only 'Connect wallet'.
- —No OpenAPI or JSON schema published for request or response bodies.
- —Exact request parameters (date range, granularity, etc.) are unknown and must be discovered experimentally.
- —The platform hosts many diverse endpoints (AI, analytics, finance, utilities) all at $0.02 — quality and depth of each is unverified.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.https://lowpaymentfee.com/api/v1/forex/CHFJPY/history
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/forex/CHFJPY/history
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network.https://lowpaymentfee.com
- —Docs, API, pricing, and README pages resolve to minimal 'Connect wallet' content with no technical documentation.https://lowpaymentfee.com/docs