Approve spender for ERC20 tokens
Part of the Cuongpo Coti Mcp server.
Free to start. No card required.
AI agents use approve_erc20_spender to create or modify resources in Cuongpo Coti Mcp. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call approve_erc20_spender repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Cuongpo Coti Mcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"approve_erc20_spender": {
"limits": [
{
"counter": "approve_erc20_spender_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Cuongpo Coti Mcp policy for all 37 tools.
These attack patterns abuse exactly the kind of access approve_erc20_spender gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Approve spender for ERC20 tokens. It is categorised as a Write tool in the Cuongpo Coti Mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Cuongpo Coti MCP server in PolicyLayer and add a rule for approve_erc20_spender: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Cuongpo Coti Mcp. Nothing to install.
approve_erc20_spender is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the approve_erc20_spender rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for approve_erc20_spender. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
approve_erc20_spender is provided by the Cuongpo Coti MCP server (https://server.smithery.ai/@cuongpo/coti-mcp/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 37 Cuongpo Coti Mcp tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.