Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/37` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/37` path is not documented — the listing title is simply "Premium API Access" and the path suggests it may relate to ACH (Automated Clearing House) payment processing or data, but no schema, parameter list, or response format is provided.
Pricing is $0.02 per request (the x402 challenge advertises maxAmountRequired of 20,000 base units of USDC, which at 6 decimals equals $0.02). Payment is made via the x402 `exact` scheme directly to the provider's wallet on Base. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what this particular endpoint returns. Prospective users should be aware that the actual functionality behind `/api/v1/ach/37` is unclear from available materials.
Capabilities
Use cases
- —Programmatic access to ACH-related data or operations via a single micropayment per call
- —Agent-driven financial workflows that need keyless, pay-as-you-go API access
- —Integrating low-cost payment-gated endpoints into automated pipelines
Fit
Best for
- —Developers wanting keyless, pay-per-use API access settled in USDC on Base
- —AI agents that can autonomously pay for API calls via x402
- —Users who need ACH-related functionality without subscription commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/37 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what this endpoint actually does, no request/response schema, no OpenAPI spec, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/ach/37 is unknown.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —The specific functionality of /api/v1/ach/37 is undocumented; 'Premium API Access' is a generic label
- —No request or response schema is provided; callers cannot know what parameters to send or what to expect back
- —No OpenAPI or ai-plugin manifest found
Citations
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/ach/37
- —Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com