Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at `/api/v1/ach/154` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all at a uniform $0.02 per request with no API keys, no rate limits, and instant access.
The specific `/api/v1/ach/154` endpoint is listed under the title "Premium API Access" but its exact functionality is not documented in the available crawl material. The path segment `ach` suggests it may relate to ACH (Automated Clearing House) payment processing or financial data, and `154` may be a resource or routing identifier, but this is speculative. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a maximum payment of 20,000 base units of USDC (0.02 USD) on the Base network, consistent with the platform's advertised $0.02/request pricing.
Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint returns. Users should be aware that the actual behavior of this endpoint is unclear despite it being live and accepting payment challenges.
Capabilities
Use cases
- —Accessing a pay-per-call API endpoint without requiring API keys or subscriptions
- —Programmatic payment-gated requests settled in USDC on Base L2
- —Agent-driven API consumption with per-request crypto micropayments
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Anyone needing detailed documentation or guaranteed SLAs before integrating
- —Use cases requiring free or trial access to evaluate endpoint behavior first
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/154 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual purpose of this specific endpoint (/api/v1/ach/154) is undocumented. The site's docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The exact functionality of /api/v1/ach/154 is not documented anywhere in the crawled material — 'Premium API Access' is the only descriptor.
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content.
- —No OpenAPI schema, request format, or response format is available.
- —The 'ach' path segment may imply financial/payment functionality which could be subject to regulatory requirements.
Citations
- —Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge confirms endpoint is live, accepts POST, requires maxAmountRequired of 20000 base units of USDC on Base.https://lowpaymentfee.com/api/v1/ach/154
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.https://lowpaymentfee.com/api/v1/ach/154