Pay-per-call premium API endpoint on Base via x402 — $0.02/request in USDC.
What it does
This endpoint (endpoint-81) is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are accessed via the x402 payment protocol on the Base network, settling in USDC (USD Coin) with no API keys, no rate limits, and no commitments required.
The specific endpoint at /api/endpoint-81 is listed under the title "Premium API Access" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a maximum payment of 20,000 base units of USDC (0.02 USD per request) on Base. The platform advertises a uniform $0.02/request pricing across all its endpoints.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what data or computation this specific endpoint returns. The platform lists other endpoints with clearer names (sentiment analysis, text summarization, geocoding, etc.) under versioned paths like /api/v2/ai/* and /api/v1/*, but endpoint-81 does not map to any of those named services. Prospective users should treat this as an opaque endpoint until the provider publishes proper documentation.
Capabilities
Use cases
- —Programmatic access to a premium API service with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API calls settled on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows on Base
- —Agents that need frictionless pay-per-use API access without registration
- —Low-volume consumers who want no-commitment, no-subscription API calls
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume production workloads where per-call pricing may add up
- —Anyone who needs to know exactly what the endpoint returns before paying
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-81 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and the docs pages are empty. The generic title 'Premium API Access' provides no functional insight, making this effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —The exact functionality of /api/endpoint-81 is unknown; it does not correspond to any of the named endpoints listed on the homepage.
- —No OpenAPI schema, no request/response examples, and no description of input parameters or output format.
- —The platform lists many endpoints but none are individually documented beyond a name and price.
Citations
- —The endpoint returns a 402 x402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units (0.02 USD).https://lowpaymentfee.com/api/endpoint-81
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/endpoint-81
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no additional content.https://lowpaymentfee.com/docs