x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/ach/149` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific endpoint is labeled "Premium API Access" but its exact functionality is not documented beyond that generic title. It is one of many endpoints on the platform, all priced at $0.02 per request.
Payment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge advertises a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD. The payment scheme is "exact" with a 300-second timeout. No API keys or rate limits are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
The platform's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all render only a "Connect wallet" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed description of what this particular endpoint returns. The endpoint path `/api/v1/ach/149` suggests it may relate to ACH (Automated Clearing House) banking data, but this is speculative. Prospective users should be aware that the lack of documentation makes it difficult to know what to send or what to expect back.
Capabilities
Use cases
- —Accessing a pay-per-request API without needing API keys or subscriptions
- —Making micropayment-gated API calls settled in USDC on Base
- —Programmatic access to an ACH-related data endpoint (speculative)
Fit
Best for
- —Developers who want keyless, pay-per-call API access via x402
- —Agents that can settle USDC payments on Base L2
- —Users exploring x402 protocol integrations
Not for
- —Anyone needing well-documented API contracts with clear request/response schemas
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/149 \
-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 at $0.02/request in USDC on Base. However, there is zero documentation on what this endpoint actually does, no request/response schema, no examples, and the docs pages are all empty. The endpoint path and title are generic/ambiguous.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet' with no content
- —The endpoint's actual functionality is unknown; 'Premium API Access' and '/api/v1/ach/149' are not self-explanatory
- —No request or response schema is provided
- —The platform lists many endpoints but none appear to have public documentation
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/149
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/ach/149
- —Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs