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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/78` is listed as "Premium API Access" and returns `application/json`. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. Payment is sent to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform also advertises endpoints for 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. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas are not publicly available.
Capabilities
Use cases
- —Agents needing on-demand data analytics or reports without API key provisioning
- —AI pipelines requiring sentiment analysis, summarization, or embeddings with per-call billing
- —Fetching real-time crypto token quotes, gas estimates, or exchange rates
- —Geocoding or data validation as a utility microservice
- —Demonstrating or testing x402 payment flows on Base
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle USDC payments on Base automatically
- —Low-volume or bursty workloads where subscription pricing is wasteful
Not for
- —High-volume production workloads where $0.02/request adds up quickly without bulk discounts
- —Users who cannot transact in USDC on the Base network
- —Applications requiring detailed SLAs, guaranteed uptime, or support contracts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/78 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are entirely gated behind wallet connection, leaving the actual functionality of /api/v1/customers/78 unclear.
Warnings
- —The specific endpoint path '/api/v1/customers/78' suggests a customer-specific resource but no documentation explains what it returns or what POST body it expects.
- —All documentation, pricing, and README pages are gated behind wallet connection and contain no public content.
- —No OpenAPI spec or request/response schema is available; callers must guess at the expected input format.
- —The broad catalog of endpoints (AI, finance, data, etc.) is advertised but none have been individually verified beyond the landing page listing.
Citations
- —Platform offers endpoints at $0.02/request 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/customers/78
- —Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeouthttps://lowpaymentfee.com/api/v1/customers/78