Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/item/13` 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 protocol, settling payments in USDC on the Base network. The specific resource at `/api/v1/item/13` is labeled "Premium API Access" but its exact functionality is not documented — it does not correspond to any of the named endpoints listed on the site's landing page (analytics, AI, finance, or utility categories).
Pricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which at 6 decimals equals $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header with each request. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what `/api/v1/item/13` actually returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge on POST), but without documentation it is unclear what payload to send or what response to expect.
Capabilities
Use cases
- —Accessing premium API resources with per-call USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to undocumented premium content
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-call API access
- —x402-compatible agents that can settle USDC on Base
- —Exploring micropayment-gated API ecosystems
Not for
- —Users who need detailed documentation or guaranteed SLAs before paying
- —Applications requiring known, well-documented request/response schemas
- —High-volume use cases where per-call pricing may add up without bulk discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/13 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific resource '/api/v1/item/13' is not documented anywhere on the site. No OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet'. The purpose of this particular endpoint is unknown beyond the generic label 'Premium API Access'.
Warnings
- —The endpoint /api/v1/item/13 does not appear in the site's listed API catalog — its actual functionality is unknown.
- —All documentation pages (/docs, /pricing, /api, /README) are empty, rendering only 'Connect wallet'.
- —No request or response schema is available; callers cannot know what payload to send or what to expect back.
- —The generic name 'Premium API Access' provides no indication of what data or service is returned.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/item/13
- —USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/item/13
- —The site lists APIs at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'https://lowpaymentfee.com/docs