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/52` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific function of the `/api/v1/ach/52` route is not documented — the path suggests it may relate to ACH (Automated Clearing House) payment processing or data lookup, but no schema, request/response examples, or dedicated documentation were found for this particular endpoint. The platform's homepage lists it under a generic "Premium API Access" label.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on Base in USDC (contract `0x8335…2913`) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). This is consistent with the site-wide $0.02/request pricing advertised on the homepage. No API keys are needed; access is gated entirely by the x402 payment header. The platform advertises no rate limits and instant access.
The broader lowpaymentfee.com platform offers endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/crypto (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a "Connect wallet" prompt with no substantive content, so details about request formats, response schemas, and actual functionality behind each route remain unknown.
Capabilities
Use cases
- —Programmatic ACH payment data retrieval or initiation via a single pay-per-call model
- —Agent-driven financial workflows that need ACH-related functionality without subscription overhead
- —Integrating ACH capabilities into crypto-native applications settled on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use ACH-related API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing quick ACH endpoint access without API key management
Not for
- —Production ACH payment processing requiring documented SLAs and compliance guarantees
- —Use cases needing detailed API documentation, request/response schemas, or sandbox testing
- —High-volume ACH operations where per-request pricing may not be cost-effective
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/52 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'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 request schema, no response schema, no description of what /api/v1/ach/52 actually does. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No documentation exists for /api/v1/ach/52 — the endpoint's actual functionality is unknown
- —All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no content
- —The 'ACH' path component suggests financial/payment functionality which may be subject to regulatory requirements
- —No request or response schema is available; callers cannot know what input is expected or what output is returned
- —The platform lists many diverse endpoints (AI, finance, geo, etc.) all at $0.02 — unclear if these are fully implemented
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/52
- —Site-wide pricing is $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/52
- —Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs