Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/119` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/119` path is not documented — the listing title is simply "Premium API Access" — so its exact capability is unclear. It may relate to ACH (Automated Clearing House) payment processing or data, but this is speculative based solely on the URL path.
Pricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC, which has 6 decimals, equaling $0.02). Payment is made inline via the X-PAYMENT header using the x402 exact scheme — no API keys, accounts, or rate limits are advertised. The endpoint accepts POST requests and returns application/json responses.
The platform's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve to a minimal "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. Without knowing what this endpoint actually does or what parameters it accepts, integration requires experimentation or direct contact with the provider.
Capabilities
Use cases
- —Accessing a pay-per-call API endpoint without needing API keys or subscriptions
- —Programmatic ACH-related data or payment operations (speculative based on URL path)
- —Agent-driven API consumption with inline USDC micropayments on Base
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Anyone needing detailed API documentation or guaranteed SLAs before integrating
- —Use cases requiring free or fiat-billed API access
- —Production systems that need well-documented request/response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/119 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, no request/response schemas. The listing title 'Premium API Access' is generic and uninformative. This is effectively a stub.
Warnings
- —The specific function of /api/v1/ach/119 is completely undocumented — the 'ACH' in the path is the only hint at its purpose
- —All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no technical content
- —No request or response schema is available; integration requires blind experimentation
- —The provider site lists many endpoints but none match this specific /api/v1/ach/119 path, raising questions about whether it is a standard offering
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/ach/119
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation pages resolve to minimal 'Connect wallet' content with no technical detailshttps://lowpaymentfee.com/docs