Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.
What it does
lowpaymentfee.com is a platform offering a suite of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/apikeys/34` is labeled "Premium API Access" and accepts POST requests with an x402 payment of up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout.
The broader platform advertises endpoints across four categories: 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what this particular endpoint returns or what input it expects. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind "Premium API Access" at `/api/v1/apikeys/34` is unclear from available materials.
Capabilities
Use cases
- —Programmatic access to premium API endpoints without traditional API key management
- —Agent-driven pay-per-call workflows settled in USDC on Base
- —Accessing data, AI, finance, or utility APIs with no upfront commitment
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or rate guarantees
- —Developers without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/apikeys/34 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing. The actual functionality of the '/api/v1/apikeys/34' endpoint is unclear — it could generate API keys or serve as a generic access point. Docs pages are empty stubs.
Warnings
- —No OpenAPI schema or detailed documentation available
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The specific purpose and response format of /api/v1/apikeys/34 ('Premium API Access') is not documented
- —No request body schema or response examples are available anywhere in the crawl
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/apikeys/34
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02https://lowpaymentfee.com/api/v1/apikeys/34
- —Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/requesthttps://lowpaymentfee.com
- —Platform advertises no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/apikeys/34