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/14` 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/14` path is not documented — the provider labels it generically as "Premium API Access" — so its exact purpose is 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. It accepts POST requests and charges up to 20,000 base units of USDC (0x8335…on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you pay per call via the x402 payment header. The x402 challenge specifies a 300-second timeout and uses the "exact" payment scheme.
Documentation is extremely sparse. The landing page lists many API paths but provides no request/response schemas, parameter descriptions, or usage examples. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content. Without knowing what this endpoint actually does or what parameters it expects, integration requires experimentation or contacting the provider.
Capabilities
Use cases
- —Programmatic access to an ACH-related or financial service endpoint with per-call USDC payment
- —Agent-driven API consumption without pre-registration or API key management
- —Integrating pay-as-you-go financial endpoints into automated workflows
Fit
Best for
- —Developers experimenting with x402 pay-per-call protocols
- —Agents that need keyless, on-demand API access settled in USDC on Base
- —Low-volume or sporadic usage where subscription pricing is wasteful
Not for
- —Users who need well-documented APIs with clear request/response schemas
- —High-volume production workloads where $0.02/request adds up significantly
- —Anyone requiring guaranteed SLAs or support contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/14 \
-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 essentially no documentation: no request/response schema, no parameter descriptions, no examples, and the endpoint's actual function is unknown. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —The specific function of /api/v1/ach/14 is undocumented — 'Premium API Access' is a generic label with no detail on what it actually does.
- —No request or response schema is available; callers must guess at valid payloads.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —The provider lists many endpoints on the landing page but none have detailed documentation.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/14
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/ach/14
- —Documentation pages render only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs