Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/ach/99`) is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
The broader lowpaymentfee.com platform advertises endpoints across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.
Documentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ach/99` endpoint actually returns. The endpoint name suggests ACH (Automated Clearing House) payment-related functionality, but this is speculative — the crawled material provides no confirmation of the endpoint's actual behavior or output format.
Capabilities
Use cases
- —Programmatic access to ACH-related data or operations via a single micropayment per call
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Integrating low-cost per-request financial endpoints without subscription overhead
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments in USDC on Base
- —Prototyping workflows that need instant API access without signup
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume batch processing where per-request pricing may add up
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/99 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The docs pages are all blank 'Connect wallet' stubs. The endpoint path '/api/v1/ach/99' is opaque without further context.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'
- —No OpenAPI or output schema describing request parameters or response format
- —The actual functionality of /api/v1/ach/99 is unknown; 'ACH' in the path is suggestive but unconfirmed
- —If this endpoint involves real financial transactions (ACH transfers), it may be subject to financial regulation
Citations
- —The endpoint returns a 402 x402 challenge requesting 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/99
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/99