Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/ach/5` is listed under "Premium API Access" and accepts HTTP POST requests. Payment is handled inline: callers attach an X-PAYMENT header with a signed USDC payment on Base, and the server fulfills the request once payment is verified. No API keys, accounts, or rate limits are advertised.
The x402 challenge captured from this endpoint specifies a `maxAmountRequired` of 20,000 base units of USDC (contract `0x8335…2913` on Base). Since USDC uses 6 decimals, this equals $0.02 per request, consistent with the site's uniform $0.02/request pricing across all listed endpoints. The payment recipient is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the maximum timeout is 300 seconds.
The broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, 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). However, the specific functionality behind `/api/v1/ach/5` is not documented beyond the label "Premium API Access." No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, pricing, and API pages all render only a wallet-connect prompt with no additional content.
Capabilities
Use cases
- —Programmatic access to a premium ACH-related endpoint with per-call USDC micropayments
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Integrating x402-compatible payment flows into automated pipelines
Fit
Best for
- —Developers or agents already using x402 payment protocol on Base
- —Use cases requiring no-signup, no-API-key access with per-request billing
- —Low-volume or bursty workloads where flat $0.02/call pricing is attractive
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription models
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/5 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of '/api/v1/ach/5' is entirely opaque beyond the generic label 'Premium API Access.' The docs, pricing, and API pages are empty (wallet-connect only).
Warnings
- —The specific functionality of /api/v1/ach/5 is undocumented — 'Premium API Access' is the only description available.
- —No OpenAPI schema, request body schema, or response schema is provided.
- —All documentation pages (docs, pricing, API, README) render only a wallet-connect prompt with no usable content.
- —The platform lists many endpoint categories but none have detailed documentation; actual capabilities are unverifiable.
Citations
- —The x402 challenge specifies maxAmountRequired of 20000 base units of USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request.https://lowpaymentfee.com/api/v1/ach/5
- —The site advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com