By name: permit2 description: Manage Uniswap Permit2 token allowances. Check, approve, revoke, or lockdown ERC-20 token approvals for DeFi protocols. metadata: { "openclaw": { "emoji": "🔐" } }
Permit2 — Token Allowance Management
When to Use
- User wants to check which tokens are approved for a protocol
- User needs to approve a token for Uniswap or other DeFi protocols
- User wants to revoke a specific token approval for a spender
- Emergency: user wants to lockdown all approvals immediately
- User is preparing for a swap or LP operation and needs Permit2 setup
When NOT to Use
- Executing swaps (use defi-trading skill)
- Managing LP positions (use liquidity skill)
- General ERC-20 transfers (use transfer skill)
Tool: permit2
Actions
| Action | Description |
|---|---|
check_allowance |
Read current Permit2 allowance for a token/spender pair |
approve |
One-time ERC-20 max approval for Permit2 contract |
approve_batch |
Approve multiple tokens for Permit2 in sequence |
revoke |
Set Permit2 allowance to zero for a specific spender |
lockdown |
Emergency: revoke all allowances for multiple token/spender pairs |
Parameters
| Param | Required For | Description |
|---|---|---|
token |
check_allowance, approve, revoke | ERC-20 token contract address (0x...) |
tokens |
approve_batch | Array of token addresses |
spender |
check_allowance, revoke | Spender address or alias |
pairs |
lockdown | Array of {token, spender} objects |
Known Spender Aliases
| Alias | Address | Usage |
|---|---|---|
universal_router |
0x198EF79F1F515F02dFE9e3115eD9fC07183f02fC | Uniswap swaps |
position_manager |
0x7C5f5A4bBd8fD63184577525326123B519429bDc | Uniswap V4 LP |
Workflow
Check existing allowance:
action: check_allowance, token: 0x833589..., spender: universal_routerApprove token for Permit2 (one-time):
action: approve, token: 0x833589...Batch approve multiple tokens:
action: approve_batch, tokens: ["0x833589...", "0x420000..."]Revoke a spender:
action: revoke, token: 0x833589..., spender: universal_routerEmergency lockdown:
action: lockdown, pairs: [{token: "0x833589...", spender: "universal_router"}, ...]
How Permit2 Works
Permit2 is a universal token approval system:
- You approve Permit2 once per token (ERC-20 → Permit2 max approval)
- For each protocol interaction, Permit2 manages per-spender allowances
- This is more secure than approving each protocol individually — one lockdown revokes everything
Security Notes
approvegrants max ERC-20 allowance to the Permit2 contract itself- Individual spender allowances are managed through Permit2's internal accounting
lockdownis the emergency kill switch — use it if you suspect compromise- Always verify spender addresses before approving