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/56` 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/56` path is not documented — the listing title is simply "Premium API Access" and the path 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 USDC, i.e., $0.02 per request). Payment is sent to a specified wallet address on the Base L2 network. The platform advertises no API keys, no rate limits, and instant access — you pay per call via the x402 header and receive a JSON response.
Documentation is extremely thin. 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 this specific endpoint returns. The platform lists many endpoints across categories but provides no detailed documentation for any of them. Users should be prepared to experiment or contact the provider for specifics.
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 payment flows with low-cost endpoints
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 micropayment APIs on Base
Not for
- —Users who need detailed API documentation before integrating
- —High-volume use cases where per-request pricing may add up without volume discounts
- —Anyone needing guaranteed SLAs or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/56 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and the crawled docs/pricing/README pages are all empty beyond a wallet connect prompt. The purpose of '/api/v1/ach/56' is unclear.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content
- —The specific function of /api/v1/ach/56 is unknown; 'Premium API Access' is a generic title
- —No request or response schema provided
- —No OpenAPI or machine-readable specification available
- —Cannot verify what data or service this endpoint actually provides
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/56
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/56
- —Docs, pricing, API, and README pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs