x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are gated behind the x402 payment protocol on the Base network, accepting USDC (USD Coin) at $0.02 per request with no API keys, rate limits, or upfront commitments.
The specific endpoint `/api/v1/trades/187` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call. Payment is made via the x402 exact scheme with a 300-second timeout window. The endpoint accepts POST requests and returns application/json.
Note that while the platform advertises many endpoint categories (sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, etc.), the crawled documentation pages were essentially empty beyond wallet-connect prompts. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind `/api/v1/trades/187` is unclear — the name suggests trade-related data but no further details are available.
Capabilities
Use cases
- —Accessing trade data behind a per-request USDC micropayment on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go data retrieval settled on-chain
Fit
Best for
- —Agents or scripts that need keyless, on-demand API access settled in USDC
- —Developers experimenting with x402 payment protocol integrations
- —Low-volume consumers who prefer per-call pricing over subscriptions
Not for
- —High-volume consumers needing bulk pricing or rate-limit guarantees
- —Users without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/187 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the actual functionality of /api/v1/trades/187 is undocumented. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — endpoint behavior must be inferred from the generic name 'Premium API Access'
- —All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no substantive content
- —The specific purpose of /api/v1/trades/187 is unclear; it does not appear in the site's listed endpoint catalog
- —No request body schema or response schema is documented anywhere
Citations
- —The endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/187
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/187
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com