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/84` is part of the lowpaymentfee.com platform, which offers a suite 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/84` 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.
Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). There are no API keys, no rate limits, and no minimum commitments advertised. Payment is made inline via the x402 `X-PAYMENT` header on each call. The endpoint accepts POST requests and returns `application/json`. The x402 challenge was successfully captured with version 1, confirming the endpoint is live.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint actually does beyond the generic "Premium API Access" label. Prospective users should be aware that the exact functionality of this endpoint is undocumented.
Capabilities
Use cases
- —Accessing ACH-related data or services on a per-request basis without subscription
- —Integrating pay-per-call endpoints into agent workflows using x402 protocol
- —Testing x402 payment flows with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents needing low-cost per-call API access without API key management
- —Projects requiring USDC-settled micropayments on Base
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone needing a well-documented, production-grade ACH integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/84 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific endpoint does, no request/response schema, no examples, and the docs pages are empty. The exact purpose of /api/v1/ach/84 is unknown.
Warnings
- —The specific function of /api/v1/ach/84 is completely undocumented — the description is only 'Premium API Access'
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content
- —No OpenAPI schema, no request body schema, and no response examples are available
- —The 'ach/84' path suggests ACH banking data but this is speculative — do not rely on it without verification
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/ach/84
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com