Pay-per-call API platform on Base offering AI, analytics, finance, and utility endpoints via x402.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments required — payment is handled inline via the x402 protocol on the Base network using USDC.
The specific endpoint probed here (`/api/v2/admin`) is described as "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). The broader platform advertises a uniform $0.02/request pricing across all its endpoints. Available API categories include: 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).
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and settles payments in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
Capabilities
Use cases
- —Running sentiment analysis or text summarization without managing API keys or subscriptions
- —Fetching real-time crypto gas estimates or token price quotes on a per-call basis
- —Geocoding addresses or validating data with instant pay-per-use access
- —Generating text embeddings for search or classification tasks
- —Exporting analytics data or retrieving metrics reports
Fit
Best for
- —Agents or bots that need keyless, pay-per-call API access
- —Developers wanting to prototype quickly without signup or rate limits
- —Web3-native applications already operating on Base with USDC
Not for
- —High-volume production workloads where per-request costs add up (no bulk discounts documented)
- —Users who need detailed API documentation, schemas, or guaranteed SLAs
- —Anyone without access to USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v2/admin \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payments. However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of the specific /api/v2/admin endpoint is unclear beyond 'Premium API Access'. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema provided for any endpoint
- —The specific purpose of /api/v2/admin ('Premium API Access') is undefined — it is unclear what this endpoint actually does versus the other listed endpoints
- —No request or response examples available anywhere
- —Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function as described
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 USDC on Basehttps://lowpaymentfee.com/api/v2/admin
- —Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v2/admin