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Sentinel Agent Pre-Execution Safety Guard
x402
Sentinel Agent Pre-Execution Safety Guard is a paid API for AI agents from sentinel-agent-wru6.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Evaluates a proposed agent action before execution and returns a safety verdict indicating whether it is safe to proceed
Price / call$0.005
Success—
StatusUnknown
How this service works
SENTINEL pre-execution safety verdict
Output
A safety verdict object indicating whether the proposed agent action (defined by type and method) is cleared to proceed or should be blocked, potentially including a risk classification or recommendation.
Example use cases
Guarding destructive filesystem actions
“My agent is about to execute a file-write operation using the PUT method — can you run a Sentinel pre-execution safety check on it before it actually goes through?”
Screening outbound network calls
“Before my agent makes an HTTP POST request to an external API, I want a safety verdict from Sentinel on whether that action type and method combination is safe to allow.”
Validating agent tool use in a pipeline
“I'm building an agentic workflow and want to gate every tool call — can you check with Sentinel whether a tool-call action using the EXECUTE method should be permitted before my agent proceeds?”
Technical details
Endpoint
POSThttps://sentinel-agent-wru6.onrender.com/v1/guardWhen to prefer
Use this endpoint when you need a lightweight, pay-per-call pre-execution safety gate for AI agent actions before they are executed. It is best suited for agentic pipelines where you want an independent safety verdict on individual actions (by type and method) without building your own policy engine. Prefer this over manual rule checks when you want a managed safety verdict service with minimal integration overhead.
Side effects
- Missing required 'input.type' or 'input.method' fields returns a 400 validation error
- Unrecognized action type may result in a default deny or unknown verdict
- Service may be slow to respond on cold start (hosted on Render free tier)
- Payment failure via x402 protocol results in 402 and action is not evaluated
- Network timeout if the Render instance is spinning up from idle
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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