> ## Documentation Index
> Fetch the complete documentation index at: https://docs.allium.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Agents

> Cross-chain AI agent activity data

The `crosschain.agents` schema provides analytics for AI agent protocols and activity across all supported chains.

## Available Protocols

| Protocol                                    | Description                                                  |
| ------------------------------------------- | ------------------------------------------------------------ |
| [x402](/historical-data/agents/x402)        | Micropayment protocol for pay-per-call API access            |
| [MPP](/historical-data/agents/mpp)          | Machine Payment Protocol for AI agent micropayments on Tempo |
| [ERC-8004](/historical-data/agents/erc8004) | On-chain agent identity and reputation standard              |