Historical USD/MXN forex data via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint provides historical exchange-rate data for the USD/MXN currency pair. It is part of the lowpaymentfee.com platform, which offers a suite of pay-per-call APIs spanning finance, analytics, AI, and utilities — all gated via the x402 payment protocol on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled inline: callers attach an X-PAYMENT header containing a signed USDC payment on Base. The cost is $0.02 per request (20,000 base units of USDC, which has 6 decimals). There are no API keys, no rate limits, and no subscription commitments — you pay only for the calls you make.
Documentation beyond the landing page is sparse. The /docs, /pricing, and /README pages all resolve to a wallet-connect stub with no additional technical detail. No OpenAPI schema, request-body specification, or sample response is published, so the exact query parameters (date range, granularity, etc.) and response shape must be discovered experimentally. The endpoint is live and returns a valid x402 challenge (HTTP 402) confirming it is ready to accept paid requests.
Capabilities
Use cases
- —Retrieve historical USD/MXN exchange rates for financial analysis
- —Feed forex history into trading bots or backtesting systems
- —Power dashboards that display peso-dollar trends over time
- —Provide FX data to AI agents that need currency context for Latin American markets
Fit
Best for
- —Developers needing on-demand forex history without subscription overhead
- —AI agents that can settle x402 micropayments on Base
- —Applications requiring USD/MXN historical data in JSON format
Not for
- —Real-time streaming forex feeds (this is a request/response history endpoint)
- —Users who cannot transact in USDC on the Base network
- —Bulk historical data downloads where per-request pricing would be cost-prohibitive
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/USDMXN/history \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts paid POST requests for $0.02 in USDC on Base. However, there is no published OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The exact request body format and response shape are unknown.
Warnings
- —No OpenAPI or schema documentation is available; request parameters and response format are undocumented.
- —The /docs, /pricing, and /README pages all render only a wallet-connect stub with no useful content.
- —The endpoint's exact query capabilities (date ranges, granularity, pagination) are unknown and must be discovered experimentally.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/forex/USDMXN/history
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/forex/USDMXN/history
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Basehttps://lowpaymentfee.com
- —The platform lists Finance & Web3 APIs including price feeds, exchange rates, token quotes, and gas estimateshttps://lowpaymentfee.com