Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource `/api/v1/accounts/139` sits within a broader platform that offers multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.
The x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x8335...2913` on Base). The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is made via the `exact` scheme with a 300-second timeout window. The response MIME type is `application/json`.
However, the specific functionality of the `/api/v1/accounts/139` endpoint is unclear. The platform's landing page does not list an "accounts" category among its documented APIs, and the description simply reads "Premium API Access" without further detail. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a "Connect wallet" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual data returned by this endpoint remains unknown.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic account data retrieval with crypto-native payment
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed documentation or OpenAPI specs before integration
- —Applications requiring free or fiat-only payment methods
- —High-volume use cases where per-request pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/139 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the documentation pages are empty stubs. The specific purpose of /api/v1/accounts/139 is undocumented, making this effectively a stub listing.
Warnings
- —The specific functionality of /api/v1/accounts/139 is not documented anywhere on the site
- —All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content
- —No OpenAPI spec or request/response schema available
- —The 'accounts' path is not listed among the platform's advertised API categories
Citations
- —Platform pricing is $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —x402 challenge shows maxAmountRequired of 20000 base units USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/139
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/139
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com