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/59` 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/59` path is not documented — the provider labels it generically as "Premium API Access" — so its exact capabilities are unclear. It may relate to ACH (Automated Clearing House) payment processing or financial data, but this is speculative based solely on the URL path.
The endpoint is live and returns a valid x402 challenge. Pricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is made via the x402 `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each POST request.
Documentation is extremely sparse. The provider's 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 a pay-per-call ACH or financial endpoint without subscription or API key management
- —Integrating x402-compatible payment flows into agent workflows
- —Testing x402 protocol integrations with a low-cost live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents needing keyless, pay-per-request API access
- —Low-volume callers who want no-commitment pricing
Not for
- —Users who need documented request/response schemas before integrating
- —High-volume production workloads requiring SLAs or support
- —Anyone needing non-USDC or non-Base settlement options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/59 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and the provider's doc pages are empty. The specific purpose of /api/v1/ach/59 is unknown.
Warnings
- —The exact functionality of /api/v1/ach/59 is completely undocumented — the 'ACH' in the path is the only hint at its purpose.
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.
- —No request or response schema is available; callers must discover the API contract by trial and error.
- —No OpenAPI or ai-plugin manifest found.
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/59
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/59
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Documentation pages render only a Connect wallet prompt with no additional contenthttps://lowpaymentfee.com/docs