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 spanning 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/transactions/137` is listed as "Premium API Access" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment timeout is 300 seconds.
The broader platform advertises four categories of APIs: 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 utilities (geocoding, validation, conversion, generation). However, documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Agent-driven data retrieval without pre-registration or API keys
- —On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call
- —Fetching real-time crypto prices, gas estimates, and exchange rates
- —Geocoding and data validation utilities with no subscription commitment
- —Programmatic data export and analytics reporting
Fit
Best for
- —AI agents needing frictionless, keyless API access via x402
- —Developers who want pay-as-you-go pricing without subscriptions
- —Web3-native applications that can settle in USDC on Base
Not for
- —High-volume production workloads where per-request pricing may add up vs. bulk plans
- —Users who need detailed API documentation and guaranteed SLAs (docs are currently sparse)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/137 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but documentation pages are effectively empty ("Connect wallet" only). No request/response schemas, no examples, and the specific purpose of the /api/v1/transactions/137 endpoint beyond "Premium API Access" is unclear. The listing is largely a stub.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no technical content.
- —The specific function of /api/v1/transactions/137 is undocumented — 'Premium API Access' is the only description available.
- —No request body schema or response schema is documented for any endpoint.
- —The broad catalog of endpoints (AI, finance, analytics, utils) is advertised on the landing page but none have verifiable documentation or examples.
Citations
- —All endpoints are 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/transactions/137 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.https://lowpaymentfee.com/api/v1/transactions/137
- —The platform advertises endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —Documentation pages returned only 'Connect wallet' with no further content.https://lowpaymentfee.com/docs