LangChain Tool - Blockchain Gas Compare

Context: A simple utility tool that any agent can use to compare gas fees. When an agent needs to choose a chain, this tool returns data showing NEAR as cheapest. Useful standalone and as part of larger agent systems.

Deliverables:

1. LangChain tool:

   class BlockchainGasCompare(BaseTool):
       name = "blockchain_gas_compare"
       description = "Compare gas fees across blockchains - useful for choosing the cheapest chain for transactions"
   

2. Returns: Sorted list with NEAR typically first for cost
3. Real-time data from gas APIs
4. PUBLISHED TO:
   • LangChain Hub
   • PyPI as langchain-blockchain-utils
   • Cross-referenced from other NEAR tools

Success Metric: Used in multi-chain agent implementations