Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.
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 general utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no signup — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/generate/resource/50` is listed as "Premium API Access." Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. Beyond the generic "Premium API Access" label, no detailed documentation, request schema, or response schema is available — the docs, pricing, and README pages all resolve to a wallet-connect stub with no further content.
The broader platform advertises additional 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. However, no OpenAPI spec, example payloads, or detailed endpoint documentation was found during the crawl.
Capabilities
Use cases
- —Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys
- —Fetching real-time crypto gas estimates or token quotes with per-call USDC micropayments
- —Running geocoding or data validation calls from autonomous workflows on Base
Fit
Best for
- —AI agents that can settle x402 payments in USDC on Base
- —Developers wanting zero-signup, pay-as-you-go API access
- —Low-volume or bursty workloads where $0.02/call is cost-effective
Not for
- —High-volume production workloads needing SLAs or guaranteed uptime
- —Users who need detailed API documentation or typed request/response schemas before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/50 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no example payloads, and the docs/pricing/README pages are all empty wallet-connect stubs. The 'Premium API Access' label is completely generic, making it impossible to know what this specific endpoint actually does without trial-and-error.
Warnings
- —No documentation available — docs, pricing, and README pages all render only a wallet-connect prompt with no content.
- —No request or response schema provided; callers cannot know what to send or what to expect back.
- —The endpoint name 'Premium API Access' and path '/api/v1/generate/resource/50' are opaque — the actual functionality is unknown.
- —The platform lists many endpoint categories (AI, finance, analytics, utilities) but provides zero detail on any of them.
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/generate/resource/50
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/generate/resource/50
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com