# Root Logos Evaluation API

> Root Logos Evaluation API is a paid API for AI agents from runtime.rootlogos.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Evaluates a proposed action, claim, policy, relation, or artifact and returns a privacy-preserving structural judgment with a tamper-evident receipt, without modifying any state.

## Facts

- Endpoint: POST https://runtime.rootlogos.com/v1/evaluation
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/root-logos-evaluation-api-0396ff64
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xTq7Qofj0u_m-lcTTgbKh

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 root-logos-evaluation-api-0396ff64 -d '<json body>'
```

Example prompt: Before we proceed, can you evaluate this proposed policy statement — 'All agents must disclose their AI nature to users upon request' — as a policy kind and give me a structural judgment and receipt? I consent to the evaluation and the evaluation ID is eval-policy-2024-001.

## When to prefer this

Choose this endpoint when you need a non-mutating, privacy-preserving structural judgment on a proposed action, claim, policy, relation, or artifact before committing to it — especially when governance, constitutional compliance, or auditability via receipt is required. Prefer it over general LLM-based evaluation when you need a tamper-evident receipt and a formal structural verdict rather than an informal opinion.

## Known failure modes

- consent field not set to true — request rejected
- statement too short (under 20 chars) or too long (over 6000 chars) — validation error
- invalid subject_kind value not in enum — schema error
- evaluation_id does not match required pattern or length — rejected
- payment not provided or insufficient (x402 protocol) — 402 Payment Required
- malformed JSON body — 400 Bad Request

## How this service works

Evaluate a proposed action, claim, policy, relation, or artifact before commitment. Returns a privacy-preserving structural judgment and receipt; it does not modify Root Logos or grant authority.

## Output

Returns a privacy-preserving structural judgment indicating whether the submitted statement (action, claim, policy, relation, or artifact) passes constitutional evaluation, along with a tamper-evident receipt. Does not modify Root Logos state or grant any authority.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "consent": {
   "type": "boolean",
   "const": true
  },
  "statement": {
   "type": "string",
   "maxLength": 6000,
   "minLength": 20
  },
  "subject_kind": {
   "enum": [
    "action",
    "claim",
    "policy",
    "relation",
    "artifact"
   ],
   "type": "string"
  },
  "evaluation_id": {
   "type": "string",
   "pattern": "^[A-Za-z0-9_-]+$",
   "maxLength": 128,
   "minLength": 16
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/root-logos-evaluation-api-0396ff64/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from runtime.rootlogos.com](https://www.zero.xyz/host/runtime.rootlogos.com/llms.txt)