x402-gated premium API access on Base, paying $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/apikeys/74` is one of many API endpoints offered by the platform, which spans 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 on the platform are priced at $0.02 per request, settled in USDC (USD Coin) on the Base L2 network. The x402 challenge confirms the asset is USDC at contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, with a maxAmountRequired of 20000 base units (i.e., $0.02 given USDC's 6 decimals). The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 X-PAYMENT header.
However, the specific functionality behind the `/api/v1/apikeys/74` path is unclear. The endpoint name "Premium API Access" and the path segment "apikeys" suggest it may be related to API key generation or management rather than a data-serving endpoint. Documentation pages (/docs, /pricing, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without traditional API key management
- —Agent-driven workflows that need on-demand API access settled in USDC
- —Accessing data, AI, finance, or utility endpoints with per-request crypto payments
Fit
Best for
- —Developers or agents who want keyless, pay-per-request API access
- —Use cases requiring low-friction micropayments on Base L2
- —Scenarios where traditional subscription billing is undesirable
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/apikeys/74 \
-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/request in USDC on Base). However, there is no documentation, no request/response schema, and the actual functionality of this specific endpoint (/api/v1/apikeys/74) is ambiguous. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No documentation available — all doc pages (/docs, /pricing, /README) return only a 'Connect wallet' prompt with no substantive content.
- —The specific functionality of /api/v1/apikeys/74 is unclear; the path suggests API key management but no schema or description is provided.
- —No OpenAPI spec, no input/output schema beyond the basic x402 outputSchema stub.
- —Cannot verify what data or service is actually returned after payment.
Citations
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/requesthttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base network settlementhttps://lowpaymentfee.com
- —x402 challenge confirms USDC asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with maxAmountRequired of 20000 base units on Base networkhttps://lowpaymentfee.com/api/v1/apikeys/74