Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at `/api/v1/ach/189` 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 platform advertises a flat $0.02 per request with no API keys, no rate limits, and instant access.
The specific `/api/v1/ach/189` path falls under what the listing calls "Premium API Access," but the site does not provide documentation explaining what this particular endpoint returns or accepts. The crawled docs, pricing, and README pages all rendered only a "Connect wallet" prompt with no further content. The x402 challenge confirms the endpoint is live and accepts POST requests, charging up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call on the Base network.
Because the platform provides no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing, it is unclear what data or functionality this specific endpoint delivers. The "ach/189" path suggests it may relate to ACH (Automated Clearing House) banking data or operations, but this is speculative. Prospective users should test the endpoint directly to determine its actual behavior.
Capabilities
Use cases
- —Accessing ACH-related data or operations on a per-call basis without subscription
- —Agent-driven API consumption with automatic USDC micropayments on Base
- —Integrating pay-as-you-go financial endpoints into automated workflows
Fit
Best for
- —Developers wanting zero-commitment, per-request API access settled in USDC
- —AI agents that can autonomously pay for API calls via x402
- —Users who prefer no API keys or rate limits
Not for
- —Anyone needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/189 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/ach/189 endpoint actually does. The docs, pricing, and README pages all returned only a wallet-connect prompt with no content.
Warnings
- —No documentation available — the endpoint's purpose and expected input/output are unknown
- —The path '/api/v1/ach/189' is not listed among the advertised APIs on the landing page, raising questions about its status
- —All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content
- —The actual functionality behind 'Premium API Access' is unspecified
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USDC) on Basehttps://lowpaymentfee.com/api/v1/ach/189
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Basehttps://lowpaymentfee.com