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 hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using the x402 protocol, settling in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/claims/28` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The platform's landing page confirms a uniform $0.02/request pricing across all listed endpoints.
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. However, documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content, so the actual behavior and schemas of these endpoints remain unverified beyond the x402 challenge.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto and finance data (prices, exchange rates, gas estimates) on a per-call basis
- —Running utility operations like geocoding, validation, and data conversion with micropayments
- —Integrating pay-per-request data analytics and reporting into agent workflows
Fit
Best for
- —AI agents that need low-friction, keyless access to diverse API capabilities
- —Developers prototyping with multiple API categories without subscription overhead
- —Web3-native applications already operating on the Base network
Not for
- —High-volume production workloads where per-request pricing adds up significantly
- —Users who need detailed API documentation and guaranteed SLAs before integration
- —Applications requiring non-USDC or non-Base payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/claims/28 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation content (all doc pages return only a wallet-connect prompt), no request/response examples, and the specific purpose of /api/v1/claims/28 is unclear beyond the generic 'Premium API Access' label. This is effectively a stub listing.
Warnings
- —Documentation pages (/docs, /pricing, /README, /api) returned no substantive content — only a wallet-connect prompt.
- —The specific behavior and expected input/output of /api/v1/claims/28 is undocumented; 'Premium API Access' is a generic label.
- —No OpenAPI spec or request/response schema is available for any endpoint.
- —The breadth of advertised endpoints (AI, finance, geocoding, etc.) cannot be verified from available material.
Citations
- —Uniform pricing of $0.02 per request across all endpointshttps://lowpaymentfee.com
- —No API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/claims/28
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/claims/28
- —Platform lists endpoints for analytics, AI, finance, and utility categorieshttps://lowpaymentfee.com