Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/159` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call 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/159` 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) banking data or routing information 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 platform's uniform pricing across all listed APIs. Payment is made via the x402 `exact` scheme to a specified wallet address on Base. No API keys, rate limits, or subscriptions are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
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 accepts or returns beyond `application/json`. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.
Capabilities
Use cases
- —Accessing ACH-related data or services on a per-request basis without subscriptions
- —Agent-driven API consumption with automatic USDC micropayments on Base
- —Integrating pay-as-you-go endpoints into workflows without managing API keys
Fit
Best for
- —Developers wanting zero-commitment, pay-per-call API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto-native micropayment rails over traditional billing
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/159 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The purpose of '/api/v1/ach/159' is entirely unclear.
Warnings
- —The specific function of /api/v1/ach/159 is completely undocumented — the endpoint's purpose is unknown.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content.
- —No OpenAPI schema or request/response examples are available.
- —The 'ach/159' path suggests ACH banking data but this is speculative — treat with caution.
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/159
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/159