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/23` 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/23` 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) payment processing or lookup given the URL path, but this is speculative.
The endpoint is live and returns a valid x402 challenge. It accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD) per call, paid to address `0x1A2B...85F3` on Base. The platform advertises no API keys, no rate limits, and instant access — you pay per request via the x402 payment header and receive a JSON response. Documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so there is no schema documentation for request parameters or response format.
Capabilities
Use cases
- —Programmatic ACH-related data retrieval or payment initiation (speculative based on URL path)
- —Agent-driven API consumption with per-call USDC micropayments on Base
- —Accessing premium data without managing API keys or subscriptions
Fit
Best for
- —Developers or agents wanting keyless, pay-per-use API access
- —Users who prefer crypto micropayments over traditional billing
- —Automated workflows that need on-demand API calls settled on Base
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-call pricing may not be cost-effective compared to subscription plans
- —Anyone needing non-crypto payment options
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/23 \
-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 this specific endpoint does, what request body it expects, or what it returns. All doc/pricing/README pages are blank ('Connect wallet' only). The endpoint path suggests ACH-related functionality but this is unconfirmed.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet' with no content
- —The specific purpose of /api/v1/ach/23 is unknown; 'Premium API Access' is a generic label
- —No request or response schema is documented anywhere
- —The endpoint may relate to ACH payment processing, which could involve regulated financial activity
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/23
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/23