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/16` 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 pricing is uniform at $0.02 per request (20,000 base units of USDC with 6 decimals), with no API keys, rate limits, or subscription commitments required.
The specific function of the `/api/v1/ach/16` endpoint is not documented beyond the generic label "Premium API Access." The site groups its APIs into categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). This particular endpoint path suggests it may relate to ACH (Automated Clearing House) payment processing or financial data, but no explicit documentation confirms its exact functionality.
The endpoint is live and returns a valid x402 challenge on POST requests. It accepts USDC payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a maximum timeout of 300 seconds. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawled pages — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content.
Capabilities
Use cases
- —Programmatic access to ACH-related data or processing via a single pay-per-call model
- —Agent-driven financial workflows that need on-demand API access without subscription management
- —Integrating low-cost per-request financial endpoints into automated pipelines
Fit
Best for
- —Developers or agents wanting zero-commitment, pay-as-you-go API access
- —Use cases requiring no API key management or account signup
- —USDC-native workflows on the Base L2 network
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may be less economical than bulk plans
- —Anyone needing non-crypto payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/16 \
-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 for what /api/v1/ach/16 actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a stub with confirmed pricing and liveness but unknown functionality.
Warnings
- —The exact functionality of /api/v1/ach/16 is undocumented — 'Premium API Access' is a generic label with no specifics.
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, request schema, or response schema is available.
- —The endpoint path suggests ACH payment-related functionality but this is unconfirmed.
Citations
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/ach/16
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/16
- —API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com