Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.
The specific endpoint at `/api/v1/transactions/202` is listed as "Premium API Access" and returns `application/json`. The x402 challenge confirms it is live, accepting POST requests, and requires a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on the Base network. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and API pages all render only a "Connect wallet" prompt), so the actual functionality, request schemas, and response formats for each endpoint are unknown.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management
- —Fetching real-time crypto token quotes and gas estimates via micropayment
- —Geocoding and data validation as a utility service with no subscription commitment
- —Exporting analytics data or generating reports on a per-request basis
Fit
Best for
- —AI agents that need keyless, pay-per-call access to diverse API endpoints
- —Developers prototyping with low-cost, no-commitment API access
- —Web3-native applications already operating on the Base network
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation and guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/202 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The actual functionality behind '/api/v1/transactions/202' and the other listed endpoints is unverifiable from available material.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) all return only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI or schema definition is available; request and response formats are unknown.
- —The purpose of '/api/v1/transactions/202' specifically is unclear — 'Premium API Access' is a generic label.
- —Multiple endpoint categories are advertised but none can be verified for actual functionality.
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/transactions/202 requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/transactions/202
- —Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com