USD/MXN forex exchange rate via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint provides the current USD/MXN foreign exchange rate, accessible through the x402 payment protocol. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC uses 6 decimals). No API keys or accounts are required — callers simply attach an x402 payment header to a POST request and receive the rate data as JSON.
The endpoint is part of a broader suite of APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/crypto, and utility services, all priced at $0.02 per call. The forex endpoint specifically targets the USD to Mexican Peso pair. Payment is settled on-chain via USDC (contract 0x8335…2913) on the Base L2 network, with a 300-second payment timeout window.
Documentation beyond the landing page is sparse — the /docs, /pricing, and /api pages all render only a "Connect wallet" 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 is confirmed live (returns a proper 402 challenge), but the exact shape of the returned forex data must be inferred.
Capabilities
Use cases
- —Fetching the current USD/MXN exchange rate for payment or remittance applications
- —Automated forex monitoring for trading bots or treasury management
- —Embedding live peso conversion rates into fintech dashboards
- —Agent-driven currency lookups without API key provisioning
Fit
Best for
- —Developers needing on-demand USD/MXN rates without signup or API keys
- —AI agents that can settle x402 micropayments on Base
- —Low-volume or bursty forex queries where per-call pricing is preferable to subscriptions
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk rate plans
- —Users who need historical forex time-series data (no evidence this endpoint provides it)
- —Callers unable to settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/forex/USDMXN/rate \
-H "X-PAYMENT: <x402_payment_header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs/pricing/API pages are all empty beyond a wallet connect prompt. The listing is functional but minimally documented.
Warnings
- —No OpenAPI or JSON schema available for request or response payloads
- —Documentation pages (/docs, /pricing, /api) contain no usable content beyond 'Connect wallet'
- —Response format for the forex rate is unknown — no examples found in crawl material
- —The broader lowpaymentfee.com platform lists many endpoints but provides no detailed docs for any of them
Citations
- —Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/forex/USDMXN/rate
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/forex/USDMXN/rate
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Payment timeout is 300 secondshttps://lowpaymentfee.com/api/v1/forex/USDMXN/rate