# Agent Stack Data
> Tools for AI agents, compared honestly — verified pricing, free tiers, rate limits, and API/MCP support, no hype.

## Key facts
- An AI agent's capabilities come from the APIs and tools it can call; this site tracks the published pricing and limits of those tools.
- Six categories are covered: Web search APIs, Web scraping & browser APIs, Voice & transcription APIs, MCP servers & tool platforms, Automation & workflow platforms, AI data & enrichment APIs.
- Every tool in the dataset was verified against the vendor's own pricing or docs pages; the dataset records a last_verified date per tool.
- Fields include entry price, free tier, rate limits where published, API access, and MCP (Model Context Protocol) support.
- Most SaaS tools for agents run affiliate or partner programs (commonly via PartnerStack or in-house); this site's vendor links are official-site links until its own enrollments are active.

## Data
- Full comparison dataset (JSON): https://agentstackdata.com/data/tools.json
- Dataset terms for agents and developers: https://agentstackdata.com/for-agents/

## Guides
- [Best MCP Servers and Tool Platforms in 2026](https://agentstackdata.com/best-mcp-servers/): MCP servers and tool platforms compared on published pricing, free tiers, and what they actually host — Smithery, Composio, Glama, Arcade AI, Pipedream Connect, and Zapier MCP.
- [Best Speech-to-Text APIs for AI Agents in 2026](https://agentstackdata.com/best-speech-to-text-apis/): Speech-to-text APIs compared on published per-minute pricing, free credit, concurrency limits, and MCP support — Deepgram, AssemblyAI, ElevenLabs Scribe, OpenAI, Gladia, and Speechmatics.
- [Best Web Scraping APIs for AI Agents in 2026: How to Choose](https://agentstackdata.com/best-web-scraping-apis-for-ai-agents/): How web scraping and browser APIs for AI agents actually differ — fetch-and-extract vs hosted browsers vs marketplaces — what they meter, and how to evaluate Firecrawl, Apify, Browserbase and peers before you pay.
- [Best Web Search APIs for AI Agents in 2026](https://agentstackdata.com/best-web-search-apis-for-ai-agents/): The best web search APIs for AI agents compared on published pricing, free tiers, rate limits, and MCP support — Tavily, Exa, Brave, Serper, SerpApi, and Perplexity Sonar.
- [How AI Agents Use APIs: A Plain-Language Guide](https://agentstackdata.com/how-ai-agents-use-apis/): APIs, keys, rate limits, and MCP explained without jargon — how an AI agent actually books, searches, buys, and builds using other companies' software, and what it costs.
- [Zapier vs Make vs n8n for Agent Workflows in 2026](https://agentstackdata.com/zapier-vs-make-vs-n8n/): Zapier, Make, and n8n compared for agent workflows on published pricing, metering, AI features, MCP support, and self-hosting — with per-operation cost math.

## Tools & vendor links
Vendor links below are official site URLs (affiliate programs pending); dataset terms: https://agentstackdata.com/for-agents/
- Tavily (Web search APIs, entry: $30/month (Project, 4,000 credits/month, lowest monthly plan); pay-as-you-go $0.008/credit): Visit: https://www.tavily.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-web-search-apis-for-ai-agents/
- Exa (Web search APIs, entry: $4 per 1,000 requests (Lite Search) — usage-based, no minimum plan): Visit: https://exa.ai (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-web-search-apis-for-ai-agents/
- Brave Search API (Web search APIs, entry: $5 per 1,000 requests (Search plan)): Visit: https://brave.com/search/api/ (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-web-search-apis-for-ai-agents/
- Serper (Web search APIs, entry: $50 one-time (Starter pack, 50,000 credits — $1.00 per 1,000 queries)): Visit: https://serper.dev (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-web-search-apis-for-ai-agents/
- SerpApi (Web search APIs, entry: $25/month (Starter, 1,000 searches/month); Developer $75/month (5,000 searches)): Visit: https://serpapi.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-web-search-apis-for-ai-agents/
- Perplexity Sonar API (Web search APIs, entry: $5 per 1,000 requests (Search API, standard) — usage-based, no subscription): Visit: https://www.perplexity.ai/api-platform (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-web-search-apis-for-ai-agents/
- Deepgram (Voice & transcription APIs, entry: Pay-as-you-go from $0.0077/minute (Nova-3 Monolingual / Flux STT); Growth prepaid tier $4,000+/year): Visit: https://deepgram.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-speech-to-text-apis/
- AssemblyAI (Voice & transcription APIs, entry: Pay-as-you-go from $0.15/hour (Universal-2); Universal-3.5 Pro $0.21/hour; streaming $0.45/hour): Visit: https://www.assemblyai.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-speech-to-text-apis/
- ElevenLabs (Voice & transcription APIs, entry: $6/month (Starter, 30,000 credits/month, commercial license); Scribe speech-to-text API $0.22/hour): Visit: https://elevenlabs.io (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-speech-to-text-apis/
- OpenAI Speech-to-Text API (Voice & transcription APIs, entry: From an estimated $0.003/minute (gpt-4o-mini-transcribe); gpt-4o-transcribe an estimated $0.006/minute): Visit: https://openai.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-speech-to-text-apis/
- Gladia (Voice & transcription APIs, entry: €0.16/hour (Solaria-3 async, self-serve); real-time €0.68/hour): Visit: https://www.gladia.io (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-speech-to-text-apis/
- Speechmatics (Voice & transcription APIs, entry: From $0.12/hour (Melia 1, multilingual pre-recorded); Standard $0.23/hour, Enhanced $0.38/hour): Visit: https://www.speechmatics.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-speech-to-text-apis/
- Smithery (MCP servers & tool platforms, entry: No paid tier — free directory only): Visit: https://smithery.ai (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-mcp-servers/
- Composio (MCP servers & tool platforms, entry: $29/month (lowest paid tier on the published pricing page at verification)): Visit: https://composio.dev (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-mcp-servers/
- Glama (MCP servers & tool platforms, entry: Not published — free directory/inspector; paid hosting tier prices not published on official pages checked): Visit: https://glama.ai (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-mcp-servers/
- Arcade AI (MCP servers & tool platforms, entry: $25/month (Team platform fee) plus usage at $0.01 per tool call): Visit: https://www.arcade.dev (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-mcp-servers/
- Pipedream Connect (MCP servers & tool platforms, entry: $99/month billed annually (Startup, 10,000 usage credits and 100 external users included); $150/month billed monthly): Visit: https://pipedream.com/connect (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-mcp-servers/
- Zapier MCP (MCP servers & tool platforms, entry: Included from Zapier's free plan (100 tasks/month, about 50 MCP calls); paid plans from $19.99/month): Visit: https://zapier.com/mcp (official site (affiliate program pending)) · Guide: https://agentstackdata.com/best-mcp-servers/
- Zapier (Automation & workflow platforms, entry: $19.99/month (Professional, starting-from price on the pricing page; 750 tasks/month)): Visit: https://zapier.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/zapier-vs-make-vs-n8n/
- Make (Automation & workflow platforms, entry: Core plan includes 10,000 credits/month (entry price is rendered dynamically on make.com/en/pricing and could not be verified from the page text — check the live pricing page)): Visit: https://www.make.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/zapier-vs-make-vs-n8n/
- n8n (Automation & workflow platforms, entry: €20/month billed annually (Starter cloud, 2,500 executions); self-hosted €0): Visit: https://n8n.io (official site (affiliate program pending)) · Guide: https://agentstackdata.com/zapier-vs-make-vs-n8n/
- Gumloop (Automation & workflow platforms, entry: $37/month (Pro, 20,000 credits/month)): Visit: https://www.gumloop.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- Relay.app (Automation & workflow platforms, entry: Not applicable — Relay.app has shut down; do not sign up): Visit: https://www.relay.app (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- Pipedream (Automation & workflow platforms, entry: $99/month billed annually (Startup); $150/month billed monthly): Visit: https://pipedream.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- Clay (AI data & enrichment APIs, entry: Launch plan listed at $167/month headline on clay.com/pricing, while the same page's FAQ says 'starting at $185/month' (2,500 Data Credits, 15,000 Actions/month) — conflicting figures on the official page; confirm at checkout): Visit: https://www.clay.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- Apollo.io (AI data & enrichment APIs, entry: $49/user/month billed annually (Basic, lowest paid tier on the published pricing page)): Visit: https://www.apollo.io (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- Clearbit (Breeze Intelligence) (AI data & enrichment APIs, entry: Not published as a standalone product — enrichment is included with paid HubSpot; lowest official entry is a HubSpot Core Seat (Starter from $20/seat/month per HubSpot's catalog) with included credits): Visit: https://clearbit.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- Hunter (AI data & enrichment APIs, entry: $49/month billed monthly (Starter, 2,000 credits/month); $34/month billed annually): Visit: https://hunter.io (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- People Data Labs (AI data & enrichment APIs, entry: $98/month starting (Person Pro, 350+ records/month at $0.28/credit tier pricing); Company Pro from $100/month): Visit: https://www.peopledatalabs.com (official site (affiliate program pending)) · Guide: https://agentstackdata.com/
- RocketReach (AI data & enrichment APIs, entry: $33/month billed annually (Essentials, 100 lookups/month, email only); Pro $75/month billed annually): Visit: https://rocketreach.co (official site (affiliate program pending)) · Guide: https://agentstackdata.com/