Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
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. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/claims/100` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.
The broader platform advertises endpoints in four categories: 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 (geocoding, validation, conversion, generation). Documentation pages exist but appear to require wallet connection and contain no visible content. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found in the crawl.
Capabilities
Use cases
- —Agents needing on-demand AI inference (sentiment, summarization, classification) without API key setup
- —Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call billing
- —Geocoding or data validation as a utility service paid in USDC on Base
- —Exporting analytics data or generating insights on a pay-as-you-go basis
Fit
Best for
- —AI agents with x402-compatible wallets that need diverse utility endpoints
- —Developers who want zero-signup, pay-per-use API access settled on-chain
- —Low-volume or bursty workloads where $0.02/request is cost-effective
Not for
- —High-volume production workloads where per-request crypto settlement adds overhead
- —Users who need detailed API documentation, schemas, or SLA guarantees before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/claims/100 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and the docs/pricing/README pages all render only a 'Connect wallet' prompt with no usable content. The specific purpose of '/api/v1/claims/100' beyond 'Premium API Access' is unclear. This is effectively a stub listing.
Warnings
- —No OpenAPI or JSON schema available for any endpoint
- —Documentation pages (/docs, /pricing, /README) contain no visible content — only a wallet-connect prompt
- —The specific function of /api/v1/claims/100 is undocumented; 'Premium API Access' is vague
- —No request body schema or response examples are available anywhere in the crawl
- —Cannot verify that the advertised AI/ML, finance, or utility endpoints actually return meaningful data
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/claims/100 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/claims/100
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com