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 accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-84`) is listed as "Premium API Access" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, subscriptions, or rate limits are advertised.
The broader lowpaymentfee.com platform advertises endpoints across four categories: 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 share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-84`) does not match any of the documented API paths on the site, so its exact functionality is unclear.
The endpoint settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge specifies a 300-second payment timeout and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found during the crawl — the docs, pricing, and API pages all rendered only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Accessing a premium API endpoint with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows
- —Agents that can settle USDC on Base for per-call API access
- —Low-volume, no-commitment API consumption without signup
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request crypto settlement overhead matters
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-84 \
-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 USDC on Base). However, the specific endpoint path /api/endpoint-84 does not correspond to any documented API on the site, no OpenAPI schema or examples exist, and all documentation pages render only a wallet-connect prompt with no useful content. The actual functionality of this endpoint is unknown.
Warnings
- —Endpoint path /api/endpoint-84 does not match any documented API path on the site — actual functionality is unknown
- —No OpenAPI schema, request/response examples, or meaningful documentation available
- —All doc/pricing/API pages render only 'Connect wallet' with no further content
- —Cannot verify what data or service this endpoint actually provides
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (=$0.02)https://lowpaymentfee.com/api/endpoint-84
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/endpoint-84
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com