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/175` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is listed under "Premium API Access" but its exact functionality is unclear — the path suggests ACH (Automated Clearing House) payment-related data or operations, though no documentation describes the request or response schema for this particular route.
The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments. The x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0.02 USDC = $0.02) on the Base network. Payment is made via the x402 `exact` scheme to the specified wallet address.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The broader site lists categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, but the `/api/v1/ach/175` route does not appear in any of those listed categories, making its purpose ambiguous.
Capabilities
Use cases
- —Accessing ACH-related data or operations via a single pay-per-call request
- —Integrating low-cost payment-gated API calls into agent workflows
- —Testing x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 pay-per-call APIs
- —Agents needing keyless, on-demand API access settled in USDC
- —Low-volume consumers who want no subscription commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —High-volume production workloads requiring rate-limit guarantees
- —Anyone needing a well-documented ACH integration with clear schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/175 \
-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 no documentation, no request/response schema, no examples, and the specific purpose of /api/v1/ach/175 is unclear. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI spec or request/response schema provided
- —The /api/v1/ach/175 endpoint is not listed among the site's advertised API categories, making its function ambiguous
- —The endpoint path suggests ACH payment operations which may fall under regulated financial services
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/175
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/175