Premium API access via x402 micropayment on Base network, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific endpoint `/api/v1/apikeys/91` accepts POST requests and charges 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
The broader lowpaymentfee.com platform advertises multiple API categories including 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/request with no API keys, no rate limits, and instant access.
However, the specific endpoint probed (`/api/v1/apikeys/91`) does not clearly map to any of the advertised API categories—it appears to be an API key provisioning or access endpoint. Documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the exact functionality of this particular endpoint remains unclear.
Capabilities
Use cases
- —Programmatic access to premium API services with per-call USDC micropayments
- —Agent-driven API consumption without pre-registration or API keys
- —On-chain settled API access for Web3-native applications
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents needing autonomous API consumption via x402
- —Users who prefer on-chain USDC payments over subscriptions
Not for
- —Users who need detailed API documentation before purchasing
- —High-volume consumers who would benefit from bulk pricing
- —Users without Base network USDC wallets
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/apikeys/91 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests/responses, and the specific purpose of the /api/v1/apikeys/91 endpoint is ambiguous. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No documentation available—all doc pages return only 'Connect wallet' prompt
- —The specific endpoint /api/v1/apikeys/91 does not clearly correspond to any advertised API category
- —No OpenAPI schema or response examples available
- —Exact functionality and expected input/output of this endpoint are unknown
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/apikeys/91
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/apikeys/91