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/48` 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 at $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
The specific `/api/v1/ach/48` path is listed under the generic title "Premium API Access" but its exact functionality is not documented on the provider's site. The path suggests it may relate to ACH (Automated Clearing House) banking or payment data, but this is speculative. The provider's landing page groups endpoints into categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure) and this particular path does not appear in any of those listed categories, making its purpose unclear.
The x402 challenge is live and well-formed: it accepts POST requests, requires payment of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 given USDC's 6 decimals. The payment timeout is 300 seconds. Documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so there is no schema, example request/response, or detailed description available for this endpoint.
Capabilities
Use cases
- —Accessing ACH-related data or functionality on a per-call basis without subscription
- —Integrating pay-per-request financial endpoints into agent workflows
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents needing low-cost per-call access without API key management
- —Projects requiring USDC-settled micropayments on Base
Not for
- —Users needing well-documented APIs with clear schemas and examples
- —High-volume use cases where per-request pricing may add up
- —Anyone needing ACH transaction initiation (no evidence this endpoint does that)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/48 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is zero documentation for this specific endpoint — no input/output schema, no examples, no description of what it actually does. All doc pages return only 'Connect wallet'. The endpoint path does not appear in the provider's own listed API catalog.
Warnings
- —Endpoint /api/v1/ach/48 is not listed in the provider's own API catalog on the landing page — its purpose is unknown
- —All documentation pages (/docs, /api, /pricing, /README) are empty, showing only 'Connect wallet'
- —No input or output schema is available; callers cannot know what to send or what to expect back
- —The term 'ACH' in the path is ambiguous — it may or may not relate to ACH banking
Citations
- —The provider lists APIs at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/ach/48
- —Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs