Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC
What it does
This endpoint at `/api/v1/ach/173` 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 specific function of the `/api/v1/ach/173` endpoint is not documented beyond its title "Premium API Access"; it sits under a path prefix suggesting ACH (Automated Clearing House) or payment-related functionality, but no schema, input parameters, or response format are published.
Pricing is $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each POST request. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payment on Base mainnet (USDC contract `0x8335…2913`).
Documentation is extremely thin. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no usage examples. The exact functionality behind this particular endpoint path (`/ach/173`) remains unclear, making it difficult to evaluate what data or service is actually returned after payment.
Capabilities
Use cases
- —Programmatic access to ACH or payment-related data via a single micropayment per call
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Integrating low-cost financial endpoints into automated pipelines without subscription commitments
Fit
Best for
- —Developers wanting zero-signup, pay-per-request API access
- —AI agents with x402-compatible wallets on Base
- —Prototyping workflows that need cheap, on-demand API calls
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production use cases where $0.02/request adds up without bulk discounts
- —Anyone needing a clearly specified request/response contract before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/173 \
-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 essentially no documentation: no OpenAPI spec, no request/response schema, no examples, and no explanation of what the /ach/173 path actually does. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content
- —The exact functionality of /api/v1/ach/173 is unknown; the 'Premium API Access' title is generic and uninformative
- —No request or response schema is published; callers cannot know what to send or what to expect back
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals) on Base networkhttps://lowpaymentfee.com/api/v1/ach/173
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/173
- —Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com