feat: add Zerion wallet intelligence skill

[abishekdharshan]

Summary

Adds Zerion skill for wallet intelligence and portfolio data.

Zerion provides interpreted crypto wallet data for AI agents:

• Portfolio values across 41+ chains (Ethereum, Base, Arbitrum, Solana, etc.)
• Token and DeFi positions with USD values and protocol labels
• Transaction history with human-readable operation types
• PnL tracking (realized, unrealized, per-asset)
• Webhook support for real-time wallet updates
• x402 pay-per-request access ($0.01 USDC on Base, no API key needed)

Research → Execute Pattern

Zerion is the research layer that pairs with Bankr as the execution layer:

Zerion (Research)          Bankr (Execute)
─────────────────         ────────────────
Portfolio analysis   →    Rebalance trades
PnL tracking         →    Stop-loss orders
Position monitoring  →    Take-profit orders
Whale watching       →    Copy trades

Files Added

zerion/
├── SKILL.md                           # Main skill definition
└── references/
    ├── api-reference.md               # Full API documentation
    ├── bankr-integration.md           # Zerion + Bankr integration guide
    └── x402-reference.md              # x402 payment flow details

Quick Start

npm install -g zerion-cli
export ZERION_API_KEY="zk_..."

zerion-cli wallet portfolio 0x...      # Total USD value
zerion-cli wallet positions 0x...      # All positions
zerion-cli wallet pnl 0x...            # Profit & loss

Links

• Zerion API Docs: https://developers.zerion.io
• Zerion for Agents: https://zerion.io/agents
• CLI: https://github.com/zeriontech/zerion-cli

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Built by @abishek (Zerion API team)