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/144` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/144` 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 given the URL path, but this is speculative.
Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). The platform advertises no API keys, no rate limits, no minimums, and instant access. Payment is handled entirely through the x402 `X-PAYMENT` header using USDC on Base (contract `0x8335…2913`). The endpoint accepts POST requests and returns `application/json`.
Documentation is extremely sparse. The `/docs`, `/api`, `/pricing`, 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 usage examples available. Without knowing what this endpoint actually does or what parameters it accepts, integration requires experimentation or contacting the provider directly.
Capabilities
Use cases
- —Accessing ACH-related data or functionality on a per-call basis without subscription
- —Agent-driven API consumption with automatic USDC micropayments
- —Integrating pay-per-use endpoints into workflows without managing API keys
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayments over traditional billing
Not for
- —Anyone needing detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may add up versus flat-rate plans
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/144 \
-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 specific endpoint does, what parameters it accepts, or what it returns. No OpenAPI spec, no examples, and all doc pages are empty. The purpose of '/api/v1/ach/144' is entirely unclear.
Warnings
- —No documentation available — /docs, /pricing, /README all return only 'Connect wallet' with no content
- —The specific function of /api/v1/ach/144 is unknown; 'Premium API Access' is a generic label
- —No request or response schema is provided; integration requires blind experimentation
- —This endpoint path suggests ACH (banking) functionality which may involve regulated financial data
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/ach/144
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/144
- —The platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com