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/140` 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/140` 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 data, given the URL path segment, 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 upfront commitments are advertised. The endpoint accepts HTTP POST requests.
Documentation is extremely thin. 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 returns or what input it expects. Prospective users would need to experiment or contact the provider to understand the endpoint's actual functionality.
Capabilities
Use cases
- —Accessing ACH-related data or functionality on a per-request basis
- —Integrating pay-per-call financial endpoints into agent workflows
- —Testing x402 payment protocol integrations with low-cost endpoints
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing low-cost per-request API access without API keys
- —Use cases requiring USDC-settled micropayments on Base
Not for
- —Users who need detailed API documentation before integrating
- —High-volume use cases where per-request pricing may add up
- —Anyone needing guaranteed SLA or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/140 \
-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 inputs it accepts, or what it returns. The generic 'Premium API Access' label and undocumented /ach/140 path make this effectively a stub listing.
Warnings
- —The specific functionality of /api/v1/ach/140 is completely undocumented — the 'ACH' path segment is the only hint at its purpose.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.
- —No OpenAPI schema, request/response examples, or parameter descriptions are available.
- —This endpoint is not listed among the provider's advertised APIs on the homepage, raising questions about its status.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/140
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/140