Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/28` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request 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/28` path is not documented — the listing title is simply "Premium API Access" and no schema or documentation describes what this particular route returns. It may relate to ACH (Automated Clearing House) payment data or processing, but this is speculative based solely on the URL path.
Pricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform advertises no API keys, no rate limits, and instant access. The endpoint accepts HTTP POST and returns `application/json`.
Documentation is extremely sparse. The `/docs`, `/pricing`, `/api`, and `/README` pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what data this endpoint actually provides or expects as input. Users should be aware that without documentation, integration requires experimentation or contacting the provider.
Capabilities
Use cases
- —Accessing ACH-related data or services on a per-request basis
- —Integrating pay-per-call APIs without managing API keys or subscriptions
- —Agent-driven API consumption with on-chain USDC settlement
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Anyone needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may add up compared to flat-rate plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/28 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no request/response schema, no examples, and the specific function of /api/v1/ach/28 is entirely undocumented. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content
- —The specific purpose of /api/v1/ach/28 is unknown; 'Premium API Access' is a generic title
- —No request or response schema is provided; input format must be guessed or discovered experimentally
- —This endpoint path (/ach/28) is not listed among the advertised APIs on the homepage
Citations
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/ach/28
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs