# AgentUtility Creature Stat Block Generator

> AgentUtility Creature Stat Block Generator is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Generates original 5e-compatible stat blocks (AC, HP, ability scores, CR, traits, actions) for any creature from any fiction, myth, game, or real-world source.

## Facts

- Endpoint: POST https://x402.agentutility.ai/creature-statblock
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentutility-creature-stat-block-generator-0724ffda
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Os91zlC-9RdnxXy9Lvmb7

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 agentutility-creature-stat-block-generator-0724ffda -d '<json body>'
```

Example prompt: Can you generate a 5e stat block for the Xenomorph from Alien — target it at around challenge rating 8?

## When to prefer this

Choose this endpoint when you need an original, ready-to-play 5e stat block for any creature that doesn't exist in official D&D sourcebooks — especially creatures from films, novels, games, myths, or songs. Ideal for game masters building homebrew encounters, worldbuilders wanting mechanical representations, or agents automating TTRPG content generation. Prefer this over manual stat block creation or generic AI prompts when you need structured, consistently formatted game statistics with all required 5e fields.

## Known failure modes

- Overly vague creature names (e.g. 'a dragon') may produce generic results
- Very obscure or extremely niche sources may produce lower-fidelity stat blocks
- Challenge rating targets far outside the creature's thematic power level may produce inconsistent results
- Payment failure via x402 protocol returns 402 error with no stat block

## How this service works

Turns any creature from any world, book, film, game, myth, or song into an original, playable 5e-style stat block. Returns AC, HP, ability scores, challenge rating, traits, and actions as original game statistics (not a copied published block). Optionally target a challenge rating. Bridges the bestiary and rollforge clusters. Use it as a creature stat block generator API or a source of homebrew monster stats for any being.

## Output

Returns a complete original 5e-style stat block including Armor Class, Hit Points, speed, all six ability scores with modifiers, challenge rating, saving throws, skills, damage immunities/resistances, senses, special traits, and actions — all generated as original game statistics for the specified creature.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "properties": {
      "creature": {
       "type": "string",
       "description": "Creature to stat, e.g. 'kraken', 'jabberwock', 'a clockwork owlbear'."
      },
      "source": {
       "type": "string",
       "description": "Optional source/universe to disambiguate."
      },
      "challenge_hint": {
       "type": "string",
       "description": "Optional target challenge rating or power level, e.g. 'CR 10', 'boss for level 5 party'."
      }
     },
     "required": [
      "creature"
     ]
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "query": {
       "type": "string"
      },
      "stat_block": {
       "type": "object",
       "properties": {
        "name": {
         "type": "string"
        },
        "size": {
         "type": "string"
        },
        "type": {
         "type": "string"
        },
        "armor_class": {
         "type": "integer"
        },
        "hit_points": {
         "type": "integer"
        },
        "challenge_rating": {
         "type": "string"
        }
       }
      }
     }
    }
   },
   "required": [
    "type"
   ]
  }
 },
 "required": [
  "input"
 ]
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "query": "Balrog",
  "stat_block": {
   "name": "Balrog",
   "size": "Huge",
   "type": "fiend",
   "hit_points": 262,
   "armor_class": 19,
   "challenge_rating": "19"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentutility-creature-stat-block-generator-0724ffda/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.agentutility.ai](https://www.zero.xyz/host/x402.agentutility.ai/llms.txt)