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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.
The specific endpoint at `/api/v1/customers/87` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout window.
The broader 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/request price point. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for individual endpoints are not publicly available.
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 programmatically
- —Running geocoding or data validation as a utility microservice
- —Exporting analytics data or generating insights reports on demand
- —Accessing exchange rates and price feeds for financial applications
Fit
Best for
- —AI agents that need frictionless, keyless API access via crypto micropayments
- —Developers prototyping with multiple API categories under a single payment model
- —Applications on Base network that want native USDC-settled API calls
Not for
- —Users who need free or subscription-based API access without crypto wallets
- —High-volume production workloads where $0.02/request adds up significantly
- —Users requiring detailed OpenAPI schemas or comprehensive documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/87 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format for this specific endpoint, and the docs/pricing/README pages are all gated behind wallet connection, yielding no useful content. The purpose of the `/api/v1/customers/87` endpoint specifically is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No OpenAPI or request/response schema available for this endpoint
- —Documentation pages are gated behind wallet connection and contain no public content
- —The specific purpose of /api/v1/customers/87 is unclear — 'Premium API Access' is a generic label
- —This endpoint path (/customers/87) with a numeric ID suggests it may return customer-specific data, but no details are documented
Citations
- —All endpoints priced at $0.02 per 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 on Base with exact scheme and 300s timeouthttps://lowpaymentfee.com/api/v1/customers/87
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/customers/87