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/161` 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/161` endpoint is not documented beyond its listing title "Premium API Access," so its exact capabilities are unclear — it may relate to ACH (Automated Clearing House) payment processing or data, given the URL path.
Pricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which has 6 decimals, equaling $0.02). The platform advertises no API keys, no rate limits, no minimums, and instant access. Payment is made via the x402 `exact` scheme to a specified wallet address on Base. The endpoint accepts HTTP POST requests and returns `application/json` responses.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this specific endpoint provides. Prospective users should be aware that the actual behavior of `/api/v1/ach/161` is undocumented and would need to be discovered through experimentation.
Capabilities
Use cases
- —Accessing ACH-related data or functionality on a per-request payment basis
- —Integrating pay-per-call financial endpoints into agent workflows without API key management
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol on Base
- —Agent-based systems needing keyless, pay-per-request API access
- —Low-volume or sporadic API usage where subscriptions are unnecessary
Not for
- —Users who need well-documented APIs with clear request/response schemas
- —High-volume production workloads where per-request pricing at $0.02 adds up
- —Anyone requiring guaranteed SLAs or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/161 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid x402 402 challenge) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation whatsoever for this specific endpoint — no request schema, no response schema, no examples, and no description of what it actually does. The docs pages are empty beyond a wallet connect prompt. The listing is effectively a stub.
Warnings
- —The exact functionality of /api/v1/ach/161 is completely undocumented — the 'ACH' path segment suggests payment/banking data but this is unconfirmed.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI schema, request format, or response examples are available.
- —No rate limit or uptime guarantees are documented despite the claim of 'no rate limits'.
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —x402 challenge shows maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/ach/161
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/161
- —Platform offers APIs across data/analytics, AI/ML, finance/web3, and infrastructure categorieshttps://lowpaymentfee.com