Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys needed.
What it does
This endpoint at `/api/v1/ach/188` 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 platform advertises a flat $0.02 per request with no API keys, no rate limits, and no commitments.
The specific `/api/v1/ach/188` path is listed under the title "Premium API Access" but its exact functionality is unclear — it does not appear in the site's publicly listed API catalog, which groups endpoints into Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories. The "ach" path segment suggests it may relate to ACH (Automated Clearing House) payment processing or financial data, but this is speculative. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02) per call on the Base network.
Documentation is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint returns or what input it expects.
Capabilities
Use cases
- —Accessing a pay-per-request financial or ACH-related endpoint without needing API keys
- —Integrating x402-compatible payment flows into agent workflows
- —Making low-cost API calls settled in USDC on Base
Fit
Best for
- —Developers experimenting with x402 pay-per-request protocols
- —Agents that can settle USDC payments on Base automatically
- —Use cases requiring keyless, commitment-free API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone needing a well-documented, production-grade ACH processing API
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/188 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <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, no schema, no request/response examples, and the specific purpose of /api/v1/ach/188 is undocumented. This is effectively a stub listing.
Warnings
- —The endpoint /api/v1/ach/188 does not appear in the site's public API catalog — its purpose is unknown.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.
- —No OpenAPI schema, request format, or response format is available.
- —The 'ach' path segment may relate to regulated financial services (ACH payments) — verify compliance requirements before use.
Citations
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/ach/188
- —The endpoint is described as 'Premium API Access' in the x402 challenge.https://lowpaymentfee.com/api/v1/ach/188