Historical CAD/CHF forex data via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides historical exchange rate data for the CAD/CHF (Canadian Dollar / Swiss Franc) currency pair. It is hosted on lowpaymentfee.com, a platform offering a variety of pay-per-request APIs spanning finance, AI, data analytics, and utilities — all gated via the x402 payment protocol on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is settled in USDC on Base at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is individually paid for via the X-PAYMENT header using the x402 exact-payment scheme. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a max timeout of 300 seconds.
Documentation on the site is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further detail. The specific request body schema (e.g., date range parameters, granularity options) and response format for the forex history endpoint are not documented anywhere in the crawled material. Users should expect to experiment with the POST body or contact the provider for integration guidance.
Capabilities
Use cases
- —Retrieving historical CAD/CHF exchange rates for backtesting trading strategies
- —Feeding forex history into financial models or risk calculations
- —Building dashboards that display historical currency trends
- —Automated agents needing on-demand forex data without API key management
Fit
Best for
- —Agents or apps that need ad-hoc forex history without subscription overhead
- —Developers who prefer crypto-native pay-per-call pricing on Base
- —Low-volume or bursty access patterns where flat-rate plans are wasteful
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 unable to pay with USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/CADCHF/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{"from": "2024-01-01", "to": "2024-06-01"}'Example
Request
{
"to": "2024-06-01",
"from": "2024-01-01"
}Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for request parameters or response format. The docs pages are empty stubs. The request body and response examples are inferred/guessed, not sourced.
Warnings
- —No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.
- —Request body schema is entirely unknown; the example_request_json is speculative.
- —Response format is undocumented; example_response_json is null.
- —The forex/CADCHF/history endpoint is not listed on the site's landing page among the advertised APIs, raising questions about its completeness or support status.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired 20000 (=$0.02).https://lowpaymentfee.com/api/v1/forex/CADCHF/history
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.https://lowpaymentfee.com/api/v1/forex/CADCHF/history