feat: add X402SearchTool for API discovery

[x402-index]

Summary

Adds X402SearchTool — natural language search across 14,000+ indexed API services for CrewAI agents.

Why

Agents should discover APIs by capability, not hardcode endpoints. This tool lets a CrewAI agent find what APIs exist for a given task, then call them — the full autonomous research loop.

What

• New X402SearchTool in lib/crewai/src/crewai/tools/x402search_tool/
• Subclasses BaseTool — zero new dependencies beyond requests (already in repo)
• Docs page added to docs/en/tools/search-research/x402searchtool.mdx
• Cost: 0.01 USDC per query via x402 protocol on Base mainnet, paid automatically
• No API key required

Usage

from crewai.tools import X402SearchTool

tool = X402SearchTool()
agent = Agent(role='API Researcher', tools=[tool])

Best queries

• crypto: 112 results
• token price: 88 results
• crypto market data: 10 results
• btc price: 8 results

Links

• Live API: https://x402search.xyz
• Related PRs: feat(python): add x402search ActionProvider coinbase/agentkit#1029, feat: add @x402-index/plugin-x402search elizaos-plugins/registry#312

[greysonlalonde]

Please see https://docs.crewai.com/en/guides/tools/publish-custom-tools

[x402-index]

Thanks for the guidance. Published as a standalone PyPI package per the custom tools guide:

• PyPI: https://pypi.org/project/crewai-x402search/
• GitHub: https://github.com/x402-index/crewai-x402search
• Install: pip install crewai-x402search

x402search gives CrewAI agents natural language search across 14,000+ indexed API services — $0.01 USDC per query via x402 on Base mainnet, no API key required.