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/170` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via x402 on the Base network using USDC. The specific endpoint is listed under "Premium API Access" but its exact functionality is unclear — the path suggests it may relate to ACH (Automated Clearing House) payment processing or data, though no documentation beyond the generic title is available.
The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and instant access. The x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 `exact` scheme to the specified payTo address.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this specific ACH endpoint provides. The platform lists many endpoint categories (data/analytics, AI/ML, finance/web3, infrastructure) but `/api/v1/ach/170` does not appear in the publicly listed catalog, making its purpose uncertain.
Capabilities
Use cases
- —Accessing ACH-related data or functionality on a per-request basis without subscription
- —Agent-driven payment workflows where per-call USDC settlement is preferred
- —Integrating low-cost financial API calls into automated pipelines
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 payment rails over traditional API key billing
Not for
- —Users needing well-documented APIs with clear request/response schemas
- —High-volume use cases where per-request pricing may add up
- —Anyone requiring traditional fiat billing or invoicing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/170 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/ach/170 is unclear. The endpoint does not appear in the site's own public catalog. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all render only a wallet-connect prompt
- —The specific endpoint /api/v1/ach/170 is not listed in the site's public API catalog
- —No request or response schema is provided; the endpoint's exact functionality is unknown
- —The generic title 'Premium API Access' gives no indication of what the endpoint actually does
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/ach/170
- —The endpoint accepts POST requests and uses x402 version 1 with the exact payment schemehttps://lowpaymentfee.com/api/v1/ach/170