LangChain Tool - Agent Marketplace Earn

Context: Searching for jobs isn't enough - agents need to complete work and get paid. This tool handles the full earning workflow: accept job, submit work, receive payment. Combined with the search tool, any LangChain agent becomes an earning agent.

Deliverables:

1. LangChain-compatible tool class:

   class AgentMarketplaceEarn(BaseTool):
       name = "agent_marketplace_earn"
       description = "Accept and complete jobs on the NEAR marketplace to earn NEAR tokens"
   

2. Full workflow:
   • Accept job (bid or direct accept)
   • Submit deliverable
   • Track payment status
   • Withdraw earnings
3. Example: Complete autonomous earning agent
4. PUBLISHED TO:
   • LangChain Hub
   • PyPI as part of langchain-near-marketplace
   • Tutorial: "Your First Earning AI Agent"
   • LangChain cookbook contribution

Success Metric: Featured in LangChain examples/tutorials