Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/ach/22` is listed as "Premium API Access" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments — each request costs $0.02 (20,000 base units of USDC with 6 decimals).
The broader lowpaymentfee.com platform advertises endpoints across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ach/22` endpoint actually returns. The endpoint is live (returns a valid x402 402 challenge), but without documentation it is unclear what data or functionality "Premium API Access" provides. The "ach" path segment may relate to ACH (Automated Clearing House) banking data, but this is speculative.
Capabilities
Use cases
- —Programmatic access to ACH-related data or services on a per-call basis
- —Agent-driven API consumption without pre-registration or API key management
- —Crypto-native pay-per-use workflows settled in USDC on Base
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-call API access
- —Use cases requiring USDC micropayments on Base L2
- —Exploring x402 protocol integrations
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone needing clarity on exactly what data this endpoint returns before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/22 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint does, what inputs it expects, or what it returns. No OpenAPI schema, no examples, and the docs pages are empty. The listing is essentially a stub with only pricing and liveness confirmed.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or input/output schema provided; request body format is unknown.
- —The purpose of '/api/v1/ach/22' is unclear — 'Premium API Access' is a generic label with no specifics.
- —If 'ACH' refers to Automated Clearing House banking services, this may fall under regulated financial data.
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/22
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs