AI Prompt Optimizer API - REST + MCP, Free Tier

Dev.to / 4/12/2026

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Key Points

AI Prompt Optimizer API analyzes prompts for token efficiency, clarity, and effectiveness, and returns an optimized prompt along with estimated token savings.
The service exposes REST endpoints including /optimize, /analyze, /estimate-tokens, and /compare, plus basic /health and API info routes for quick integration checks.
It offers a Free tier with 100 requests per day covering core endpoints, while the Pro tier ($29/mo) expands to unlimited usage and includes MCP support.
The API supports Model Context Protocol (MCP) via JSON-RPC 2.0, enabling tool discovery (e.g., tools/list) through an MCP endpoint.
Users can obtain an API key via a Gumroad link, suggesting the product is designed for developers who want prompt optimization tooling with minimal setup.

AI Prompt Optimizer API

Analyze prompts for token efficiency, clarity, and effectiveness. Returns optimized version with estimated token savings.

Quick Start

# Health check
curl https://api.lazy-mac.com/ai-prompt-optimizer/health

# API info
curl https://api.lazy-mac.com/ai-prompt-optimizer

Endpoints

/optimize
/analyze
/estimate-tokens
/compare

Pricing

Plan	Price	Features
Free	$0/mo	100 req/day, core endpoints
Pro	$29/mo	Unlimited, all endpoints, MCP

MCP Integration

This API supports the Model Context Protocol (JSON-RPC 2.0):

curl -X POST https://api.lazy-mac.com/ai-prompt-optimizer/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"tools/list","id":1}'