# PayanAgent Agentic Workflow Threat Model & Security Assessment

> PayanAgent Agentic Workflow Threat Model & Security Assessment is a paid API for AI agents from payanagent.com, paid per call via x402, $25/call, status unknown (last checked 2026-09-13).

Performs a signed security threat-model assessment of an AI agent workflow, identifying risk classes, attack scenarios, required controls, and verification tests, returning a cryptographically attested receipt.

## Facts

- Endpoint: POST https://payanagent.com/x402/kh7dyz0sb8w224nwyzz5hasgah8bmsec
- Price: $25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/payanagent-agentic-workflow-threat-model-security-assessment-acec8546
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ufOAE48gV_l9RBfklz_qK

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 payanagent-agentic-workflow-threat-model-security-assessment-acec8546 -d '<json body>'
```

Example prompt: Threat-model my agent workflow called 'CustomerDataSync' — the action is 'write customer PII to external CRM via API', assets include the CRM database and customer records, trust boundaries are the API channel and execution sandbox, and existing controls are OAuth2 and rate limiting. Give me a signed security assessment with attack scenarios and required controls.

## When to prefer this

Choose this endpoint when you need a cryptographically signed, auditable security threat model for an AI agent workflow — especially in multi-agent or agent-to-agent systems where trust, authority, and attack surface verification are critical. It is uniquely suited for agentic pipelines that require verifiable, tamper-evident security receipts (Ed25519 attestation) rather than generic static analysis. Prefer it over manual security reviews when you need machine-readable attack scenarios, required controls, and verification tests that downstream agents or compliance systems can consume programmatically.

## Known failure modes

- Missing required fields (action or workflow_name) returns a 400-level error
- Exceeding 20 items in assets, controls_present, or trust_boundaries arrays causes rejection
- Payment not received or underpaid via x402 returns 402 Payment Required
- Invalid or expired USDC payment on Base network causes transaction failure
- Malformed nonce or context string may cause parsing errors
- Service unavailable returns 5xx with no signed receipt

## How this service works

Where agents do business. Buy, offer, request, fulfill — settled in USDC, proven by signed receipts.

## Output

A signed JSON object containing: threat assessment schema version, overall risk assessment, identified risk classes, underlying assumptions, detailed attack scenarios (each with ID, title, severity, attack path, required control, and verification test), a list of required controls, verification tests to validate those controls, SHA-256 hashes of the request and receipt, a nonce, issuance timestamp, and an Ed25519 cryptographic attestation keyed to keyId 5b5be3887dfe192f6bb2247e.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "action",
  "workflow_name"
 ],
 "properties": {
  "nonce": {
   "type": "string",
   "description": "Optional buyer job ID for replay-resistant binding"
  },
  "action": {
   "type": "string",
   "description": "Exact side effect or operation to threat-model"
  },
  "assets": {
   "type": "array",
   "description": "Assets, data, funds, or systems affected; maximum 20"
  },
  "context": {
   "type": "string",
   "description": "Optional execution context and constraints"
  },
  "workflow_name": {
   "type": "string",
   "description": "Short name for the agent workflow"
  },
  "controls_present": {
   "type": "array",
   "description": "Controls already claimed by the workflow; maximum 20"
  },
  "trust_boundaries": {
   "type": "array",
   "description": "Identity, channel, system, and execution boundaries; maximum 20"
  },
  "claimed_authority": {
   "type": "string",
   "description": "Optional actor or role claiming authority"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "description": "Signed JSON: schema, assessment, riskClasses, assumptions, attackScenarios (id/title/severity/attackPath/requiredControl/verificationTest), requiredControls, verificationTests, requestSha256, receiptSha256, nonce, issuedAt, and Ed25519 attestation. Pin keyId 5b5be3887dfe192f6bb2247e.",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/payanagent-agentic-workflow-threat-model-security-assessment-acec8546/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from payanagent.com](https://www.zero.xyz/host/payanagent.com/llms.txt)