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/33` 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 — callers simply attach an x402 payment header to each request.
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 translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The payment timeout is 300 seconds.
The broader lowpaymentfee.com platform offers endpoints across several categories including data/analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, the specific functionality behind `/api/v1/ach/33` is not documented beyond the generic "Premium API Access" label. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl — the docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Programmatic access to ACH-related data or operations at $0.02 per call
- —Agent-driven workflows requiring low-cost, keyless API access on Base
- —Integrating pay-per-use endpoints without subscription overhead
Fit
Best for
- —Developers wanting keyless, pay-per-request API access
- —AI agents that can settle x402 payments in USDC on Base
- —Use cases requiring low-cost, no-commitment API calls
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume callers who would benefit from bulk/subscription pricing
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/33 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind '/api/v1/ach/33' is completely undocumented. The docs pages returned only 'Connect wallet' with no content.
Warnings
- —The specific functionality of /api/v1/ach/33 is undocumented — 'Premium API Access' is the only description available
- —No OpenAPI schema, request body format, or response examples are provided anywhere
- —All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content
- —The 'ach' path segment suggests ACH (Automated Clearing House) banking functionality, but this is unconfirmed
Citations
- —Flat pricing of $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeouthttps://lowpaymentfee.com/api/v1/ach/33
- —Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com