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/47` 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/47` route is not documented beyond its generic title "Premium API Access," so its exact purpose is unclear — the "ach" path segment suggests it may relate to ACH (Automated Clearing House) banking or payment data, 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 request, since USDC uses 6 decimals). Payment is made via the x402 `exact` scheme to a specified wallet address on Base. The platform advertises no API keys, no rate limits, and instant access — you pay per call with no subscription or commitment.
Documentation is extremely sparse. The landing page lists available API categories and pricing, but the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint accepts or returns. The `outputSchema` in the x402 challenge confirms it is an HTTP POST endpoint but provides no further detail about input parameters or response format.
Capabilities
Use cases
- —Accessing ACH or payment-related data on a per-request basis without subscription
- —Integrating pay-per-call APIs into agent workflows using x402 protocol
- —Testing x402 micropayment flows on Base network
Fit
Best for
- —Developers experimenting with x402 pay-per-request protocols
- —Agents needing no-auth, no-key API access settled in USDC on Base
- —Low-volume or sporadic API consumers who want to avoid subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
- —Anyone needing a well-documented, production-grade ACH integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/47 \
-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 OpenAPI schema, no request/response examples, no description of what the endpoint does, and all doc pages render only 'Connect wallet'. The specific function of /api/v1/ach/47 is unknown.
Warnings
- —Endpoint purpose is undocumented — 'Premium API Access' is a generic label with no specifics
- —All documentation pages (docs, API, pricing, README) return only 'Connect wallet' with no content
- —No OpenAPI schema, no request/response examples available
- —The 'ach' path segment may imply financial/banking data, which could involve regulatory considerations
- —No information on input parameters or response format
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/47
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/47
- —Documentation pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs