Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/trades/36` is listed as "Premium API Access" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.
The site offers 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 (geocoding, validation, conversion, generation). However, the specific `/api/v1/trades/36` endpoint is not listed on the homepage among these categories, and its exact functionality is unclear — the description simply says "Premium API Access" with no further documentation.
The x402 challenge confirms the endpoint is live, accepting payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maxAmountRequired of 20000 base units equals $0.02 (USDC has 6 decimals). No OpenAPI schema, detailed documentation, or example responses were found in the crawl.
Capabilities
Use cases
- —Accessing trade data or executing trade-related queries via a single paid API call
- —Integrating pay-per-use API access into agent workflows without managing API keys
- —Testing x402 protocol payment flows on Base network
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/36 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific /api/v1/trades/36 endpoint is not listed among the site's advertised APIs. Its actual functionality is unknown.
Warnings
- —The /api/v1/trades/36 endpoint is not listed among the site's publicly advertised APIs — its purpose is unclear.
- —No documentation, OpenAPI spec, or example responses are available for this endpoint.
- —All non-homepage pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no useful content.
- —Functionality behind 'Premium API Access' is entirely opaque — callers cannot know what they are paying for.
Citations
- —The platform charges $0.02 per request with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base network.https://lowpaymentfee.com/api/v1/trades/36
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/trades/36
- —The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com