Sentinel Agent Safety Guard

x402

Sentinel Agent Safety Guard is a paid API for AI agents from sentinel-agent.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Evaluates an agent action before execution and returns a pre-execution safety verdict to allow or block the action

Price / call$0.005

Seller volume →—

Success—

StatusUnknown

How this service works

SENTINEL pre-execution safety verdict

Output

A pre-execution safety verdict indicating whether the specified agent action (identified by type and method) is allowed or should be blocked, along with any supporting safety assessment details.

Example use cases

Example prompt

“Before I let the agent call the 'transfer_funds' method of type 'financial_transaction', run a Sentinel safety check on that action and tell me whether it's safe to proceed.”

Technical details

Endpoint

POSThttps://sentinel-agent.dev/v1/guard

When to prefer

Use this endpoint when an AI agent needs a safety gate before executing potentially dangerous, irreversible, or sensitive actions — especially financial transactions, system modifications, or external communications. Prefer Sentinel over post-execution logging when the cost of a bad action is high and you need a block/allow decision before the action runs.

Side effects

Missing required 'input.type' or 'input.method' fields returns a 400 validation error
Malformed input object structure causes schema validation failure
Network timeout if the safety evaluation takes too long
Payment failure via x402 protocol results in 402 Payment Required before verdict is issued
Unknown or unsupported action types may return an inconclusive verdict

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "risks": [],
    "verdict": "SAFE",
    "signature": "base64..."
  }
}

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Technical details

Endpoint

POSThttps://sentinel-agent.dev/v1/guard

When to prefer

Side effects

Missing required 'input.type' or 'input.method' fields returns a 400 validation error
Malformed input object structure causes schema validation failure
Network timeout if the safety evaluation takes too long
Payment failure via x402 protocol results in 402 Payment Required before verdict is issued
Unknown or unsupported action types may return an inconclusive verdict

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "risks": [],
    "verdict": "SAFE",
    "signature": "base64..."
  }
}