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-enabled API platform that exposes a broad catalog of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments — payment is handled via the x402 protocol on the Base network using USDC.
The specific endpoint at `/api/v1/trades/142` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per request. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on the Base network with a 300-second timeout.
The broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented.
Capabilities
Use cases
- —Fetching trade data on a per-request basis without needing an API key or subscription
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) with micropayments
- —Retrieving real-time crypto quotes, gas estimates, and exchange rates via x402-gated calls
- —Running geocoding, validation, or data conversion tasks with instant pay-per-use billing
Fit
Best for
- —Agents or developers who want keyless, pay-per-call API access on Base
- —Projects needing low-cost micropayment-gated data and AI endpoints
- —Web3-native workflows that settle API costs in USDC on L2
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who prefer subscription-based pricing over per-request payments
- —Teams that require fiat-only payment rails with no crypto involvement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/142 \
-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), but there is no documentation, no OpenAPI schema, no request/response examples, and the docs/pricing/README pages are all empty. The specific purpose of /api/v1/trades/142 is unclear beyond the generic label 'Premium API Access'.
Warnings
- —No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content
- —No request or response schema provided for /api/v1/trades/142; actual behavior is unknown
- —The endpoint path '/api/v1/trades/142' does not appear in the site's listed API catalog, making its purpose unclear
- —The platform lists many endpoint categories but none have documented schemas or example responses
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/trades/142 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/trades/142
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages returned only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs