Approve USDC.e spending for Polymarket CTF Exchange contract
AI agents use pm_approve_collateral to create or update resources in Waiaas — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Waiaas environment.
Token approvals are Write operations as they create reversible state changes (the approval can be revoked). However, this carries high severity because: (1) it enables subsequent transfers of user funds by the approved contract, (2) Polymarket is a financial prediction market platform, (3) unlimited approvals could expose significant value to smart contract risk, and (4) combined with other DeFi tools on this…
From the tool's definition Approve USDC.e spending for Polymarket CTF Exchange contract — this is a token approval operation that modifies smart contract state by granting spending permissions to an external contract
Documented attack patterns abuse exactly the kind of access pm_approve_collateral gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Waiaas, and nothing reaches the server without passing your rules. This is the rule we recommend for pm_approve_collateral:
{
"version": "1",
"default": "deny",
"tools": {
"pm_approve_collateral": {
"limits": [
{
"counter": "pm_approve_collateral_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}pm_approve_collateral stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Approve USDC.e spending for Polymarket CTF Exchange contract. It is categorised as a Write tool in the Waiaas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Waiaas MCP server in PolicyLayer and add a rule for pm_approve_collateral: 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 Waiaas. Nothing to install.
pm_approve_collateral 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 pm_approve_collateral 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 pm_approve_collateral. 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.
pm_approve_collateral is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Waiaas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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