Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at `/api/v1/item/18` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network. The listed price is $0.02 per request (20,000 base units of USDC with 6 decimals), with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint `/api/v1/item/18` is labeled "Premium API Access" but its exact functionality is not documented beyond that generic title. The site lists 16 distinct API paths across four categories (analytics/metrics, AI inference, finance/crypto data, and utility services), all priced identically at $0.02 per call. However, `/api/v1/item/18` does not correspond to any of the named endpoints on the landing page, so its precise behavior is unclear. It accepts HTTP POST requests and returns `application/json`.
The x402 challenge is live and well-formed: it specifies the "exact" payment scheme, USDC asset contract `0x8335...2913` on Base, with a max timeout of 300 seconds. Documentation beyond the landing page is essentially empty — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. Prospective callers should be aware that without further documentation, the request body format and response schema for this specific item endpoint are unknown.
Capabilities
Use cases
- —Programmatic access to a pay-per-call API without needing API keys or subscriptions
- —Agent-driven workflows that settle per-request payments in USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —Agents that can settle USDC micropayments on Base
- —Users who want zero-commitment, pay-as-you-go API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where $0.02/request adds up significantly
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/18 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's functionality is undocumented. No request/response schema, no examples, and all doc pages are empty beyond a wallet-connect prompt. The endpoint path '/api/v1/item/18' doesn't match any named API on the landing page, making its purpose opaque.
Warnings
- —The endpoint '/api/v1/item/18' is not listed among the 16 named APIs on the landing page — its actual functionality is unknown.
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.
- —No request body schema or response schema is available; callers must guess the expected input format.
- —The generic title 'Premium API Access' provides no indication of what data or service is returned.
Citations
- —The site lists 16 API endpoints across four categories, all priced at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02/request with no API keys, no rate limits, instant access, on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Basehttps://lowpaymentfee.com/api/v1/item/18
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/item/18