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 marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/87` is listed as "Premium API Access" and appears to serve trade-related data. The platform advertises four broad categories of APIs: 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).
Pricing is uniform at $0.02 per request across all listed endpoints. The x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the maximum timeout is 300 seconds.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/trades/87` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data to POST or what response to expect.
Capabilities
Use cases
- —Fetching trade data without API key registration
- —Accessing AI inference endpoints (sentiment, summarization, classification) on a pay-per-use basis
- —Retrieving real-time crypto quotes and gas estimates
- —Geocoding and data conversion utilities via micropayments
Fit
Best for
- —Agents or developers who want instant API access without sign-up or API keys
- —Low-volume or sporadic usage where per-request pricing is cheaper than subscriptions
- —x402-compatible wallets and agents on the Base network
Not for
- —High-volume production workloads where $0.02/request adds up quickly
- —Users who need detailed API documentation or SLAs before integrating
- —Users without USDC on Base or an x402-compatible payment flow
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/87 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the trades/87 endpoint actually returns or what input it expects. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'
- —No OpenAPI or JSON schema describing request or response formats
- —The specific endpoint /api/v1/trades/87 has no description beyond 'Premium API Access' — unclear what trade data it returns
- —The trades endpoint is not listed on the homepage's API catalog, raising questions about its purpose
Citations
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/trades/87
- —Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages all show only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs