Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled on the Base network using the x402 protocol and USDC. The specific endpoint `/api/endpoint-96` is labeled "Premium API Access" and accepts POST requests. Payment is made per call with no API keys, no rate limits, and no upfront commitments.
The site advertises a broad catalog of endpoints spanning 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 listed endpoints are priced at $0.02 per request. The x402 challenge for this endpoint specifies a maxAmountRequired of 20000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02.
Documentation is extremely sparse — the /docs, /api, /pricing, 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 `/api/endpoint-96` actually returns. The endpoint is live (returns a proper 402 x402 challenge), but without documentation it is unclear what input it expects or what output it produces.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint without needing API keys or subscriptions
- —Agent-driven workflows that pay per call using USDC on Base
- —Testing x402 protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, pay-as-you-go API access on Base
- —Low-cost per-request API consumption without rate limits
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Production workloads requiring guaranteed SLAs or support
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-96 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose and output of /api/endpoint-96 specifically are undocumented, making this effectively a stub listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response format for /api/endpoint-96.
- —The specific function of /api/endpoint-96 is unknown; the site lists many other endpoints but this one is not among them.
- —Cannot verify what data or service this endpoint actually provides.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/endpoint-96
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/endpoint-96
- —The site advertises endpoints for data & analytics, AI & ML, finance & Web3, and infrastructure utilitieshttps://lowpaymentfee.com