Buy ad distribution in a hub. Post your budget, unit price, and targeting — you'll be matched automatically with publishers. You pay only the publisher's floor price (not your max), plus the hub fee. One bid can fill across multiple publishers.
Risk signalsAccepts URL/endpoint input (callback_url) · High parameter count (19 properties)
Part of the Picoads server.
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AI agents use post_bid to create or modify resources in Picoads. 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 post_bid 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 Picoads.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"post_bid": {
"limits": [
{
"counter": "post_bid_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Picoads policy for all 13 tools.
These attack patterns abuse exactly the kind of access post_bid 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.
Buy ad distribution in a hub. Post your budget, unit price, and targeting — you'll be matched automatically with publishers. You pay only the publisher's floor price (not your max), plus the hub fee. One bid can fill across multiple publishers.. It is categorised as a Write tool in the Picoads MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Picoads MCP server in PolicyLayer and add a rule for post_bid: 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 Picoads. Nothing to install.
post_bid 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 post_bid 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 post_bid. 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.
post_bid is provided by the Picoads MCP server (https://picoads.xyz/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 Picoads tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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