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/150` 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 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no upfront commitments.
The specific `/api/v1/ach/150` endpoint is listed under the title "Premium API Access" but its exact functionality is unclear from available documentation. The path suggests it may relate to ACH (Automated Clearing House) payment processing or fee calculations, possibly returning information about ACH transactions with a parameter of 150 (which could be an amount, a routing identifier, or a configuration value). However, no schema, request/response examples, or detailed documentation were found for this specific route.
The x402 challenge confirms the endpoint is live and accepts POST requests. It requires payment of up to 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint is discoverable and uses the "exact" payment scheme.
Capabilities
Use cases
- —Querying ACH-related payment information or fee calculations on a per-call basis
- —Integrating low-cost financial data lookups into agent workflows without managing API keys
- —Building payment processing tools that need ACH reference data
Fit
Best for
- —Developers needing simple pay-per-use ACH data without subscriptions
- —AI agents that can settle micropayments in USDC on Base
- —Prototyping financial applications with zero onboarding friction
Not for
- —Production ACH payment initiation or money movement (no evidence this endpoint moves funds)
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/150 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, and no explanation of what the /api/v1/ach/150 endpoint actually returns. The docs, pricing, and API pages all render only a 'Connect wallet' prompt with no useful content.
Warnings
- —No documentation available for this specific endpoint — functionality of /api/v1/ach/150 is unknown
- —The /docs, /pricing, /api, and /README pages all return only 'Connect wallet' with no substantive content
- —This endpoint is not listed among the advertised APIs on the homepage, raising questions about its status
- —The 'Premium API Access' title is generic and does not describe actual functionality
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/ach/150
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/ach/150