Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/39` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call 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/39` path is not documented — the provider labels it generically as "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 based on the URL path, 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 site-wide flat rate advertised across all their APIs. 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 — callers simply attach an x402 payment header to each request.
Documentation is extremely sparse. The docs, pricing, API, 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 beyond the MIME type `application/json`. Prospective users should be aware that the actual functionality behind 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 via x402
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agents needing low-cost per-request API access without API key management
- —Projects requiring USDC-settled micropayment APIs
Not for
- —Users who need well-documented API contracts with clear request/response schemas
- —High-volume use cases where per-request pricing may add up versus subscription models
- —Anyone needing guaranteed SLA or support — no documentation or support channels visible
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/39 \
-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 for what this specific endpoint does, what inputs it accepts, or what it returns. The provider's docs pages are empty ("Connect wallet" only). The endpoint path suggests ACH-related functionality but this is unconfirmed. Effectively a stub listing.
Warnings
- —The specific functionality of /api/v1/ach/39 is completely undocumented — the label 'Premium API Access' is generic and uninformative.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no actual content.
- —No OpenAPI schema, no request/response examples, and no description of accepted parameters.
- —The 'ACH' in the path may imply financial/banking data, which could be a regulated category — verify compliance before use.
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/39
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/39
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs