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/75` 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/75` path is not documented — the listing title is simply "Premium API Access" — so the exact data or service it returns is unclear. It may relate to ACH (Automated Clearing House) payment processing or fee lookup given the URL path, but this is speculative.
The endpoint is live and returns a valid x402 challenge. Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02), consistent with the site-wide flat rate. Payment is made via the x402 `exact` scheme to a specified wallet address. The platform advertises no API keys, no rate limits, and instant access. However, documentation is essentially nonexistent — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available.
Because the endpoint's actual functionality is undocumented, agents should treat this as a low-information listing. The x402 challenge confirms it is live and accepting payments, but without knowing what data or service is returned, integration requires experimentation or contacting the provider.
Capabilities
Use cases
- —Querying ACH-related payment data or fee information on a per-call basis
- —Integrating pay-per-request financial APIs without managing API keys or subscriptions
- —Agent-driven workflows that need on-demand financial data with crypto micropayments
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments in USDC on Base
- —Projects needing ACH or payment-related data without signup
Not for
- —Users who need well-documented APIs with clear request/response schemas
- —High-volume use cases where per-request pricing may add up
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/75 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live with a valid x402 challenge and consistent pricing, but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The /docs and other pages are empty. The endpoint path suggests ACH-related functionality but this is purely inferred from the URL.
Warnings
- —Endpoint functionality is completely undocumented — the actual service behind /api/v1/ach/75 is unknown
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —No OpenAPI spec or request/response schema available
- —The 'Premium API Access' title is generic and does not describe the endpoint's purpose
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/ach/75
- —The platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com