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/27` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific function of the `/api/v1/ach/27` path is not documented — the provider labels it generically as "Premium API Access" — but the site groups its endpoints into categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.
Pricing is uniform across the platform at $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC, which at 6 decimals equals $0.02). Payment is made inline via the x402 `exact` scheme: callers attach an `X-PAYMENT` header with a signed USDC payment on Base to the payTo address `0x1A2B…85F3`. There are no API keys, no rate limits, and no subscription commitments — each call is independently settled on-chain.
The endpoint is live and returns a proper 402 challenge when called without payment. However, documentation is extremely thin: the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. The actual request/response schema for `/api/v1/ach/27` is unknown — the outputSchema in the challenge only confirms it accepts HTTP POST. Without knowing what this specific endpoint does or what payload it expects, callers will need to experiment or contact the provider.
Capabilities
Use cases
- —Programmatic access to an ACH-related service with per-call USDC micropayments
- —Agent-driven API consumption without pre-registration or API key management
- —Integrating pay-as-you-go endpoints into automated workflows on Base
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Anyone needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-call on-chain settlement overhead matters
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/27 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/v1/ach/27 actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub listing.
Warnings
- —The specific function of /api/v1/ach/27 is completely undocumented — the label 'Premium API Access' is generic and uninformative.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content.
- —No request body schema or response schema is available; callers must guess or reverse-engineer the API.
- —The 'ach' path segment suggests ACH (Automated Clearing House) banking functionality, which may involve regulated financial services — verify compliance requirements before use.
Citations
- —Pricing is $0.02 per request across the platformhttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/27
- —Asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Basehttps://lowpaymentfee.com/api/v1/ach/27