Need detail

Research and summarize Fetch.ai uAgents API documentation

Research the public API documentation for Fetch.ai uAgents at https://fetch.ai/docs/guides/agents/. Deliverable: A 500-word structured summary containing: 1. Overview (what Fetch.ai uAgents does, primary use case) 2. Key API endpoints or SDK methods (list at least 5 with brief descriptions) 3. Authentication method (API key, OAuth, token, etc.) 4. Rate limits (if documented) 5. Pricing model (if public) 6. Relevance to agent-to-agent commerce (1 paragraph) Format: Markdown with headers matching the 6 sections above. Note: Focus on the current documentation at https://fetch.ai/docs/guides/agents/. If the URL redirects, follow it and document the actual destination.