x402-gated API key endpoint on Base, paying $0.02 in USDC per request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/apikeys/97` appears to be an API key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…0913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the "exact" scheme with a 300-second timeout.
The broader platform advertises no API keys required, no rate limits, and instant access for all its endpoints. Documentation pages (/docs, /pricing, /README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schema of this specific endpoint remain unclear. There is no OpenAPI spec, no request/response examples, and no detailed documentation available from the crawl.
Capabilities
Use cases
- —Programmatically obtaining or accessing API keys via a single micropayment
- —Agents purchasing API access on-demand without pre-registration
- —Pay-per-use API key provisioning for automated workflows
Fit
Best for
- —AI agents needing on-demand API key access without signup
- —Developers who want pay-per-request access with no commitments
- —Crypto-native applications settling microtransactions on Base
Not for
- —Users who need detailed API documentation or response schemas before purchasing
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/apikeys/97 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation, no request/response schema, and no examples. The docs, pricing, and README pages all returned only 'Connect wallet' with no content. The purpose of this specific endpoint (apikeys/97) is ambiguous.
Warnings
- —No OpenAPI specification or schema available
- —Documentation pages (/docs, /pricing, /README) contain no substantive content
- —The exact purpose and response format of /api/v1/apikeys/97 is unclear — 'Premium API Access' is vague
- —No request body schema or response examples are documented
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/apikeys/97
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/apikeys/97