Can I use this agent without paying for an API key?

Yes. Swap API is completely free and unauthenticated. You'll need an OpenAI or Anthropic key, but those have free trials ($5-$18 in free credits). Your first hundred trades cost zero.

Will this actually execute swaps, or just quote them?

It quotes them. Execution requires signing the transaction with your private key—which you control separately. The agent returns the calldata and contract address; you choose whether to broadcast it.

What chains does this work on?

Any EVM chain. Ethereum, Arbitrum, Base, Optimism, Polygon, Avalanche, and 40+ others. The `chain_id` parameter determines which network you're quoting on.

Quotes return in 1-3 seconds on average. The bottleneck is the LLM thinking time, not the API. OpenAI's function calling adds 500-1000ms per round-trip.

🛠️ Developer Tools

Build Your Own AI Trading Agent: The $44 Billion Opportunity Crypto Developers Are Missing

AI trading agents just moved $44 billion in 2025. Here's how you can build one—with free tools, no authentication headaches, and code you can deploy today.

Open Source Beat Apr 03, 2026 6 min read 10 views

Code snippet showing Python function calling setup for AI trading agent with Swap API integration

⚡ Key Takeaways

AI trading agents moved $44B in 2025 and are improving 4x YoY—this isn't theoretical anymore 𝕏
Function calling transforms chatbots into autonomous agents by giving LLMs structured access to APIs 𝕏
Swap API is free, unauthenticated, and covers 46 EVM chains—zero barriers to building and testing 𝕏
The real opportunity isn't copying existing agents; it's understanding function calling as the primitives layer for autonomous systems 𝕏

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#AI trading agent #DeFi automation #LLM function calling #Swap API #agent architecture #crypto developer tools

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