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/6` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/ach/6` is listed under the title "Premium API Access" but its exact functionality is not documented on the provider's site. The landing page groups endpoints into categories (analytics, AI, finance, infrastructure) but does not list this particular ACH path among them. The "ach" path segment and the numeric suffix suggest it may relate to ACH (Automated Clearing House) banking or payment data, but this is speculative. The x402 challenge confirms the endpoint is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (i.e., $0.02) per call on the Base network.
Because no OpenAPI schema, request/response examples, or detailed documentation are available for this specific endpoint, callers should experiment with POST requests to discover the expected input format and response structure. The provider's site pages beyond the landing page returned only "Connect wallet" content, offering no additional technical detail.
Capabilities
Use cases
- —Accessing ACH-related data or functionality on a per-request basis without subscription
- —Integrating pay-per-call financial endpoints into agent workflows
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers exploring x402 pay-per-request APIs
- —Agents needing on-demand financial/ACH data without API key management
- —Low-volume or sporadic API usage where subscriptions are wasteful
Not for
- —High-volume batch processing where per-request pricing adds up
- —Use cases requiring well-documented, schema-validated endpoints
- —Production systems that need guaranteed SLAs and support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/6 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality is unknown. The specific path '/api/v1/ach/6' is not listed on the provider's landing page among its advertised APIs.
Warnings
- —Endpoint functionality is undocumented — the 'ach/6' path is not listed among the provider's advertised API categories
- —No OpenAPI schema or request/response examples available
- —All documentation pages beyond the landing page returned only 'Connect wallet' with no technical content
- —The exact purpose of this endpoint is unclear; 'Premium API Access' is a generic title
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/ach/6
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/6