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Nomos Agent Action Preflight Check
x402
Nomos Agent Action Preflight Check is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Evaluates an agent's proposed action (tool call, shell command, wallet operation, etc.) for identity, risk, and authorization before execution.
Price / call$0.01
Success—
StatusUnknown
How this service works
Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.
Output
Returns a JSON object containing a risk_level (e.g. 'low', 'medium', 'high'), a numeric risk_score (0–100), a list of flags indicating specific policy concerns, plus optional identity, activity, assessment, and provenance sub-objects describing the evaluated action context.
Example use cases
Guard agent wallet spend
“My agent is about to make an x402_purchase for 25.00 USDC targeting 'api.datavendor.io' in production — run a preflight check for agent ID 'agent-trader-01' and tell me the risk score and whether it's safe to proceed.”
Screen autonomous shell command
“Before my agent runs a shell command targeting 'rm -rf /var/tmp/cache' in the staging environment, do a risk preflight check and flag anything suspicious.”
Pre-authorize agent email action
“My agent 'newsletter-bot' wants to send an email to 'subscribers@list.com' in the production environment — can you run a preflight assessment and tell me the risk level before it goes out?”
Technical details
Endpoint
GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/agent/action-preflightWhen to prefer
Use this endpoint when an autonomous agent needs a real-time, pay-per-use preflight gate before executing any side-effecting action — especially wallet operations, shell commands, deployments, or external API calls. Prefer it over static rule engines when you need dynamic risk scoring with identity and provenance context baked in, and when operating on the Base blockchain ecosystem with x402 micropayment support.
Side effects
- Missing required query parameters (action_type or target) returns a 400 validation error
- Invalid action_type enum value returns schema validation failure
- Payment not included or insufficient USDC returns 402 Payment Required
- Malformed agent_id pattern (non-alphanumeric) causes parameter rejection
- Extremely high-risk actions may return a 'block' recommendation rather than an error, requiring human_approval_ref
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "agent-action-preflight",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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