Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.
What it does
lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/products/16` is labeled "Premium API Access" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per request. No API keys, rate limits, or subscriptions are needed — callers simply attach an x402 payment header to each POST request.
The broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. The `/api/v1/products/16` endpoint does not have a more specific description beyond "Premium API Access," so its exact functionality is unclear from available documentation.
Documentation pages (/docs, /api, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content during the crawl, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable. The x402 challenge confirms the endpoint is live and accepting POST requests with JSON output, settling payments in USDC on Base to address 0x1A2B…85F3.
Capabilities
Use cases
- —Accessing premium data or utility endpoints without API key registration
- —Agent-driven workflows that need on-demand API calls with crypto micropayments
- —Prototyping integrations where per-call billing avoids subscription overhead
Fit
Best for
- —Developers or agents who want zero-signup, pay-as-you-go API access
- —x402-compatible clients on the Base network
- —Low-volume or bursty workloads where $0.02/call is cost-effective
Not for
- —High-volume production workloads where per-call micropayments add overhead
- —Users who need detailed API documentation or SLAs before integrating
- —Callers without Base-network USDC or x402 client support
Quick start
# Requires an x402-compatible client that attaches payment headers.
# Example using curl (payment header must be constructed per x402 spec):
curl -X POST https://lowpaymentfee.com/api/v1/products/16 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but the endpoint's actual functionality behind "Premium API Access" is undocumented. All doc pages returned only wallet-connect prompts with no schemas, examples, or parameter descriptions. This is effectively a stub listing.
Warnings
- —The exact functionality of /api/v1/products/16 ('Premium API Access') is not described anywhere in the crawled material.
- —All documentation pages (/docs, /api, /pricing, /README) returned no substantive content — only a 'Connect wallet' prompt.
- —No request or response schema is available; callers must discover behavior empirically.
- —The broader platform lists many endpoint categories but none were individually verified beyond the homepage listing.
Citations
- —The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.https://lowpaymentfee.com/api/v1/products/16
- —All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums.https://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —Documentation pages returned only 'Connect wallet' with no substantive content.https://lowpaymentfee.com/docs