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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. 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/charges/152` 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. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.
The broader platform advertises categories including: 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 a wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.
Capabilities
Use cases
- —Agent-driven data retrieval without API key management
- —On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call
- —Fetching real-time crypto prices, gas estimates, or exchange rates with micropayments
- —Geocoding or data validation as a utility service with no subscription commitment
- —Programmatic data export and analytics without rate limits
Fit
Best for
- —AI agents needing frictionless, keyless API access via x402
- —Developers who want pay-as-you-go pricing without subscriptions
- —Applications requiring low-cost micropayment-settled API calls on Base
Not for
- —High-volume batch workloads where per-request pricing becomes expensive
- —Users who need detailed SLAs, uptime guarantees, or enterprise support
- —Applications requiring non-USDC or non-Base-network payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/152 \
-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, documentation pages are gated behind wallet connection, so no request/response schemas, detailed endpoint descriptions, or usage examples are available. The specific purpose of the /api/v1/charges/152 'Premium API Access' endpoint is unclear beyond its generic title.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all appear gated behind wallet connection — no actual docs content was retrievable.
- —The specific functionality of /api/v1/charges/152 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint.
- —No OpenAPI spec, request schema, or response schema is available for any endpoint.
- —No information on uptime, SLAs, or data freshness is provided.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/charges/152 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/charges/152
- —Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com