Historical NZD/CHF forex data via pay-per-request x402 on Base network
What it does
This endpoint provides historical forex data for the NZD/CHF currency pair. It is part of the lowpaymentfee.com platform, which offers a variety of pay-per-call APIs spanning finance, analytics, AI, and infrastructure — all settled via the x402 protocol on the Base network using USDC.
The endpoint is accessed via HTTP POST at `/api/v1/forex/NZDCHF/history`. Each request costs $0.02 (20,000 base units of USDC with 6 decimals) and requires no API key or account registration. Payment is handled inline through the x402 `X-PAYMENT` header. The platform advertises no rate limits and instant access.
Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what parameters the history endpoint accepts or what shape the response takes. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what historical data granularity, date ranges, or output fields are available.
Capabilities
Use cases
- —Retrieving historical NZD/CHF exchange rate data for backtesting trading strategies
- —Feeding forex history into financial models or analytics dashboards
- —Programmatic access to NZD/CHF rates without API key management
Fit
Best for
- —Agents or apps needing on-demand forex history with crypto-native payment
- —Developers who want keyless, pay-per-call access to currency data
- —Automated trading systems that need NZD/CHF historical rates
Not for
- —Users needing comprehensive multi-pair forex data in a single call
- —Anyone requiring detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk historical data downloads at lower per-unit cost
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/NZDCHF/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it exists and accepts payment. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The exact request parameters and response format are unknown.
Warnings
- —No API documentation available — docs, pricing, and README pages are empty
- —No OpenAPI or JSON schema describing request parameters or response format
- —The specific endpoint /api/v1/forex/NZDCHF/history is not listed on the landing page; only /api/v1/finance/rates and /api/v1/finance/prices are shown, so this may be an undocumented or newer route
- —Cannot confirm what historical data fields, date ranges, or granularity are supported
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/forex/NZDCHF/history
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/forex/NZDCHF/history