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/29` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The platform advertises a flat $0.02 per request with no API keys, no rate limits, and no minimum commitments.
The specific `/api/v1/ach/29` endpoint is listed under the title "Premium API Access" but its exact functionality is unclear — the path suggests ACH (Automated Clearing House) payment-related functionality, but no documentation describes the input/output schema or behavior. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires up to 20,000 base units of USDC (0.02 USDC = $0.02) per call on the Base network. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The provider's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a "Connect wallet" prompt with no substantive content, so there is no detailed API documentation available. The endpoint's actual response format and required request body are unknown.
Capabilities
Use cases
- —Programmatic ACH payment initiation or lookup via a single pay-per-call request
- —Agent-driven financial operations without managing API keys or subscriptions
- —Integrating low-cost payment infrastructure into automated workflows
Fit
Best for
- —Developers wanting zero-setup, pay-as-you-go ACH-related API access
- —AI agents that can settle micropayments in USDC on Base
- —Projects needing keyless API access with no rate limits
Not for
- —Users who need detailed API documentation before integrating
- —Production systems requiring guaranteed SLAs or support contracts
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/29 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the ACH endpoint actually does, what request body it expects, or what it returns. All doc pages are empty stubs showing only 'Connect wallet'. The generic title 'Premium API Access' provides no insight into functionality.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no content
- —The exact functionality of /api/v1/ach/29 is unknown; 'Premium API Access' is a generic label
- —Request body schema and response format are completely undocumented
- —The provider lists many endpoint categories but none match the /api/v1/ach/ path pattern visible in the probe
Citations
- —Flat pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge confirms endpoint is live, accepts POST, requires up to 20000 base units of USDC on Base with 300-second timeouthttps://lowpaymentfee.com/api/v1/ach/29
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/29