x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-protocol API platform that gates a broad catalog of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/trades/77` is listed as "Premium API Access" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access.
The broader platform 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). All listed endpoints share the same $0.02/request pricing. However, this specific listing is for `/api/v1/trades/77`, which does not appear in the site's public catalog — its exact functionality is unclear from available documentation.
Documentation is extremely thin. The /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service `/api/v1/trades/77` actually returns is not documented.
Capabilities
Use cases
- —Fetching trade data or trade-related information via a single paid API call
- —Integrating pay-per-request APIs into agent workflows without managing API keys
- —Accessing on-demand data services settled via USDC on Base
Fit
Best for
- —Agents or developers who want keyless, pay-per-call API access
- —Users who prefer on-chain USDC micropayments over subscription billing
- —Workflows requiring low-cost single-request data retrieval
Not for
- —Users needing detailed API documentation or schemas before integration
- —High-volume use cases where per-request pricing may add up versus flat-rate plans
- —Users without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/77 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation for this specific endpoint (/api/v1/trades/77), no request/response schema, no examples, and the endpoint does not appear in the site's public catalog. Docs pages are empty. Functionality must be guessed from the path alone.
Warnings
- —The endpoint /api/v1/trades/77 is not listed in the site's public API catalog — its purpose is unknown.
- —All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no content.
- —No OpenAPI spec, request schema, or response schema is available.
- —No examples of request or response payloads exist in crawled material.
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/trades/77
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/trades/77
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com