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/171` 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/171` path is not documented — the listing title is simply "Premium API Access" — so the exact data or service it returns is unclear. The ACH path prefix suggests it may relate to ACH (Automated Clearing House) payment processing or data, 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 the "exact" scheme on Base mainnet, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests 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 schema, no request/response examples, and no description of what this specific endpoint actually does. Prospective users should be aware that the endpoint's actual functionality is undocumented.
Capabilities
Use cases
- —Accessing ACH-related data or services on a per-request basis without subscription
- —Agent-driven API consumption with automatic x402 micropayments
- —Integrating low-cost financial data endpoints into automated workflows
Fit
Best for
- —Developers wanting zero-setup API access with crypto micropayments
- —AI agents that can settle x402 payments autonomously on Base
- —Users who need occasional API calls without committing to a subscription
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Anyone requiring non-crypto payment methods (no fiat/card option available)
- —High-volume users who would benefit from bulk pricing or rate-limited tiers
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/171 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid x402 402 challenge), and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation of what this specific endpoint does, no request/response schema, no examples, and the docs pages are empty. The function of '/api/v1/ach/171' is entirely opaque.
Warnings
- —The specific functionality of /api/v1/ach/171 is completely undocumented — the endpoint 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 examples are available.
- —The 'ACH' path prefix may imply financial/payment processing, which could fall under regulated categories.
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals) = $0.02, paying to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base.https://lowpaymentfee.com/api/v1/ach/171
- —The platform offers APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories.https://lowpaymentfee.com