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Nomos Tool Access Decision API
x402
Nomos Tool Access Decision API is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).
Performs a preflight risk and authorization assessment for an agent attempting to use a specific tool, returning a risk score and flags before execution.
Price / call$0.03
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 the network (e.g. eip155:8453), product identifier, and an assessment object with risk_score (numeric), risk_level (e.g. 'low'), and a flags array listing any concerns. May also include identity, activity, and provenance objects for deeper context.
Example use cases
Pre-execution tool gating for production agent
“My agent 'agent-prod-7f2a' is about to call the 'database-write' tool with action type 'insert' in production — run a Nomos preflight check first and tell me the risk score and any flags before it proceeds.”
Staging environment risk check for new tool
“We're testing a new tool called 'file-delete' in our staging environment with agent 'agent-test-001' and action type 'delete' — can you run a risk assessment through Nomos to see if we should be worried?”
Compliance gate for financial agent tool
“Agent 'agent-finance-88' wants to execute action type 'transfer' using the 'crypto-transfer' tool in production — run a Nomos tool access preflight and let me know if the risk level is low enough to proceed.”
Technical details
Endpoint
POSThttps://base-agent-preflight.bytoken2023.workers.dev/x402/v1/decision/tool-accessWhen to prefer
Use this endpoint when you need a lightweight, pay-per-request preflight decision on whether an autonomous agent should be permitted to invoke a specific tool before execution occurs. Prefer this over full IAM or policy engines when you need fast, per-call risk scoring integrated into an agent loop with x402 micropayment support on Base.
Side effects
- Missing required query parameters (agent_id, tool_name, action_type) returns a 400 validation error
- Invalid or unauthorized agent_id may return a rejection or elevated risk score
- Payment failure or missing x402 payment header results in 402 Payment Required
- Unknown tool_name or action_type may result in a generic assessment with no specific flags
- Network or Cloudflare Worker timeout may result in a 503 or empty response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "eip155:8453",
"product": "nomos-tool-access",
"assessment": {
"flags": [],
"risk_level": "low",
"risk_score": 0
}
}
}Tags
x402
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