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/90` 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 function of the `/api/v1/ach/90` route is not documented — the path suggests it may relate to ACH (Automated Clearing House) payment processing or data, with "90" possibly being a parameter (e.g., a 90-day window), but this is speculative. The provider's landing page lists categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all priced at $0.02 per request.
The x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…) on Base. Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by micropayment.
Documentation is extremely thin. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no explanation of what this specific endpoint returns. Prospective users should be aware that the actual functionality behind this route is undocumented.
Capabilities
Use cases
- —Programmatic access to ACH-related data or operations via micropayment
- —Agent-driven financial workflows that need per-call payment without subscriptions
- —Integrating low-cost payment-gated API calls into Web3 applications
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access on Base
- —AI agents with USDC wallets needing frictionless endpoint access
- —Prototyping financial integrations without API key management
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where $0.02/request adds up without bulk discounts
- —Anyone needing non-crypto payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/90 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and network. However, there is zero documentation on what this specific endpoint does, no request/response schema, and no examples. The docs pages are empty. The endpoint's purpose (ACH/90) is entirely unclear.
Warnings
- —No documentation exists for /api/v1/ach/90 — its actual functionality is unknown
- —All doc/pricing/README pages render only 'Connect wallet' with no content
- —No OpenAPI spec or request/response schema available
- —The meaning of 'ach/90' in the path is unverified — could be ACH-related or an arbitrary route
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/90
- —All APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com