Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $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 subscription commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/11` is listed as "Premium API Access" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (asset `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and settles payments to address `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 to require a wallet connection and contain no visible content, so the actual request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Accessing customer or premium data records without managing API keys or subscriptions
- —Agent-driven workflows that need low-cost, on-demand API calls settled in USDC
- —Integrating analytics, AI inference, or financial data into applications with per-call billing
Fit
Best for
- —Developers who want zero-friction API access without signup or API key management
- —AI agents that can autonomously pay for API calls via x402
- —Users already operating on the Base L2 network with USDC
Not for
- —Users who need detailed API documentation or well-defined request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription discounts
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/customers/11 \
-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 spec, no documented request/response schema, and all documentation pages behind wallet-connect walls render no useful content. The purpose of the specific `/customers/11` endpoint is unclear beyond its generic 'Premium API Access' label.
Warnings
- —No OpenAPI or schema documentation available — request and response formats for this endpoint are unknown
- —All documentation pages (docs, api, pricing, README) appear to require wallet connection and contain no visible content
- —The specific purpose of /api/v1/customers/11 ('Premium API Access') is not explained anywhere — it is unclear what data it returns
- —Cannot verify what the broader platform endpoints actually do; only the landing page descriptions are available
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/customers/11
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/customers/11