# Nomos Agent Authorization Profile

> Nomos Agent Authorization Profile is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $1/call, status unknown (last checked 2026-09-13).

Evaluates an agent's mandate and requested action to produce a risk score, risk level, and authorization flags for pre-flight clearance before execution.

## Facts

- Endpoint: POST https://base-agent-preflight.bytoken2023.workers.dev/x402/v1/agent/authorization-profile
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nomos-agent-authorization-profile-04b1440b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YyvhR7C2h7mtFQA9M332P

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability nomos-agent-authorization-profile-04b1440b -d '<json body>'
```

Example prompt: Before my agent goes ahead and purchases this API call, run a Nomos authorization profile check on its mandate to confirm the risk level is acceptable and there are no authorization flags blocking an API_PURCHASE action.

## When to prefer this

Use this endpoint when an autonomous agent needs a structured pre-flight authorization check — specifically a risk score and flag assessment — before executing an API_PURCHASE action. It is purpose-built for agent-to-agent or agent-to-API authorization gating on the Base network with pay-per-request pricing via x402, making it suitable for agentic workflows where you want a lightweight, on-demand clearance signal rather than a persistent identity or session-based auth system.

## Known failure modes

- Missing or malformed mandate field returns a validation error
- Invalid requested_action type (not API_PURCHASE) may return an unsupported action error
- Payment not processed correctly via x402 results in 402 Payment Required before assessment is returned
- High risk score or non-empty flags indicate the agent should not proceed but the API call itself succeeds
- Network or Cloudflare Worker downtime returns 5xx error

## 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 identifier (e.g. eip155:8453 for Base), a product label (nomos-agent-authorization-profile), and an assessment block with a list of flags (empty if clean), a risk_level string (e.g. 'low'), and a numeric risk_score (e.g. 0). A clean result has empty flags and a low risk score, indicating the agent is cleared to proceed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "mandate": {
   "type": "string"
  },
  "requested_action": {
   "type": "API_PURCHASE"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "network": "eip155:8453",
  "product": "nomos-agent-authorization-profile",
  "assessment": {
   "flags": [],
   "risk_level": "low",
   "risk_score": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nomos-agent-authorization-profile-04b1440b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from base-agent-preflight.bytoken2023.workers.dev](https://www.zero.xyz/host/base-agent-preflight.bytoken2023.workers.dev/llms.txt)