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/83` 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/83` path is not documented — the listing title is simply "Premium API Access" and the endpoint sits under an `/ach/` path prefix that doesn't appear in the site's published API catalog. It may relate to ACH (Automated Clearing House) payment processing or bank transfer functionality, but this is speculative.
Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment on Base to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys, rate limits, or upfront commitments are required. The endpoint accepts POST requests and returns `application/json`.
The broader lowpaymentfee.com platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — all at the same $0.02/request price point. Documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so request/response schemas for this or any other endpoint are unknown.
Capabilities
Use cases
- —Programmatic ACH or payment-related operations via a single micropayment per call
- —Agent-driven financial workflows that need keyless, pay-as-you-go API access
- —Integrating low-cost payment infrastructure into automated pipelines
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access settled in USDC on Base
- —AI agents that can autonomously pay for API calls via x402
- —Prototyping workflows that need cheap, commitment-free API endpoints
Not for
- —Production use cases requiring well-documented request/response schemas
- —Users who need fiat-only payment rails with no crypto involvement
- —High-volume batch processing where per-call pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/83 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/ach/83 is undocumented. No request/response schema, no examples, and all documentation pages are empty. The endpoint path doesn't appear in the site's own API catalog.
Warnings
- —The /api/v1/ach/83 path is not listed in the provider's published API catalog — its actual functionality is unknown.
- —All documentation pages (/docs, /api, /pricing, /README) are empty, showing only 'Connect wallet'.
- —No request or response schema is available; callers cannot know what to send or what to expect back.
- —The 'Premium API Access' title is generic and does not describe what this endpoint does.
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/ach/83
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com