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/8` is listed as "Premium API Access" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments.
The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The broader site offers endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all at the same $0.02 price point.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. The exact functionality of the `/api/v1/ach/8` endpoint is unclear from available materials; the name suggests ACH (Automated Clearing House) banking-related functionality, but no schema, request/response examples, or detailed descriptions are provided. Users should test the endpoint to confirm its behavior before relying on it in production.
Capabilities
Use cases
- —Programmatic ACH-related lookups or operations paid per request
- —Agent-driven financial workflows requiring no pre-registration
- —Integrating low-cost API calls settled on-chain via USDC on Base
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Prototyping workflows that need cheap per-call pricing without rate limits
Not for
- —Users who need detailed documentation or guaranteed SLAs before integration
- —High-volume production workloads where endpoint behavior is unverified
- —Anyone requiring fiat-only payment rails with no crypto involvement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/8 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no request/response schema, and no explanation of what the /api/v1/ach/8 endpoint actually does. The docs pages are all blank wallet-connect prompts. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content
- —The exact functionality of /api/v1/ach/8 is unknown; 'Premium API Access' is the only description provided
- —No request or response schema is available; endpoint behavior must be discovered by trial
- —If this endpoint relates to ACH banking operations, it may fall under financial regulation
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/ach/8
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/8