Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint (endpoint-91) 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-91 is listed under the generic title "Premium API Access" with no further documentation about what it actually does. The x402 challenge confirms it is live and accepts POST requests, requiring up to 20,000 base units of USDC (0.02 USD) per call on the Base network. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at $0.02 per request. However, this particular endpoint (endpoint-91) does not appear in the site's listed API catalog, and no documentation, input schema, or response schema is available for it. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an undocumented endpoint on an otherwise functional platform.
Capabilities
Use cases
- —Programmatic access to an undocumented premium endpoint via x402 micropayment
- —Agent-driven API consumption without API key management
- —Pay-per-use API calls settled on-chain in USDC on Base
Fit
Best for
- —Developers exploring x402 payment protocol integrations
- —Agents that need keyless, pay-per-call API access on Base
- —Testing x402 micropayment flows with low-cost endpoints
Not for
- —Users who need documented input/output schemas before calling
- —Production workloads requiring SLA guarantees or detailed documentation
- —Anyone needing free or subscription-based API access
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-91 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and endpoint-91 does not appear in the site's published API catalog. The docs/pricing/API pages are all empty beyond a wallet connect prompt. This is effectively a stub listing.
Warnings
- —Endpoint /api/endpoint-91 is not listed in the provider's published API catalog — its purpose is unknown
- —No input schema or output schema is documented anywhere
- —All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content
- —Cannot verify what data or service this endpoint actually provides
Citations
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge confirms the endpoint is live, accepts POST, and requires up to 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/endpoint-91
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/endpoint-91
- —The platform lists endpoints for analytics, AI, finance, and infrastructure categorieshttps://lowpaymentfee.com