REST API

The Chucky service provides a REST endpoint for one-shot prompts. This is useful when you don’t need a persistent WebSocket session.

For multi-turn conversations or streaming with tools, use the WebSocket API instead.

Endpoint

POST https://conjure.chucky.cloud/prompt

Request

Headers

Header	Required	Description
`Content-Type`	Yes	Must be `application/json`
`Accept`	No	Response format: `text/event-stream` for SSE, `application/json` for JSON (default)

Body

{
  "message": "What is the capital of France?",
  "options": {
    "token": "your-jwt-token",
    "model": "claude-sonnet-4-5-20250929",
    "systemPrompt": "You are a helpful assistant.",
    "maxTurns": 5
  }
}

Options

Field	Type	Required	Description
`token`	`string`	Yes	JWT authentication token
`model`	`string`	No	Claude model (default: `claude-sonnet-4-5-20250929`)
`systemPrompt`	`string`	No	System prompt for Claude
`tools`	`array`	No	Tool definitions
`allowedTools`	`string[]`	No	Whitelist of allowed tools
`disallowedTools`	`string[]`	No	Blacklist of blocked tools
`maxTurns`	`number`	No	Maximum conversation turns
`maxBudgetUsd`	`number`	No	Max cost for this request
`maxThinkingTokens`	`number`	No	Max tokens for extended thinking
`outputFormat`	`object`	No	Structured output schema
`mcpServers`	`object`	No	MCP server configurations

Response Formats

JSON Response (Default)

When Accept: application/json or no Accept header:

{
  "result": {
    "type": "result",
    "subtype": "success",
    "text": "The capital of France is Paris.",
    "total_cost_usd": 0.0012,
    "duration_secs": 1.5,
    "usage": {
      "input_tokens": 50,
      "output_tokens": 20
    }
  },
  "messages": [
    {
      "type": "assistant",
      "subtype": "text",
      "text": "The capital of France is Paris."
    },
    {
      "type": "result",
      "subtype": "success",
      "text": "The capital of France is Paris.",
      "total_cost_usd": 0.0012
    }
  ],
  "sessionId": "550e8400-e29b-41d4-a716-446655440000"
}

SSE Response (Streaming)

When Accept: text/event-stream:

event: message
data: {"type":"assistant","subtype":"text","text":"The capital of "}

event: message
data: {"type":"assistant","subtype":"text","text":"France is Paris."}

event: message
data: {"type":"result","subtype":"success","text":"The capital of France is Paris.","total_cost_usd":0.0012}

event: done
data: {"sessionId":"550e8400-e29b-41d4-a716-446655440000"}

Error Responses

Authentication Errors

{
  "error": "Token expired"
}

Status: 401 Unauthorized

Budget Exceeded

{
  "error": "user_budget_exhausted",
  "ai": {
    "used": 1000000,
    "remaining": 0,
    "budget": 1000000
  },
  "compute": {
    "used": 3600,
    "remaining": 0,
    "budget": 3600
  }
}

Status: 429 Too Many Requests

Concurrency Limit

{
  "error": "concurrent_limit_reached",
  "active": 5,
  "max": 5,
  "sessions": [
    { "sessionId": "abc123", "userId": "user1", "ageMs": 45000 }
  ]
}

Status: 429 Too Many Requests

Developer Budget Exceeded

{
  "error": "developer_budget_exhausted",
  "used": 500000,
  "available": 0,
  "planSeconds": 500000,
  "poolSeconds": 0
}

Status: 402 Payment Required

Examples

cURL - JSON Response

curl -X POST https://conjure.chucky.cloud/prompt \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -d '{
    "message": "What is 2 + 2?",
    "options": {
      "token": "your-jwt-token"
    }
  }'

cURL - SSE Streaming

curl -X POST https://conjure.chucky.cloud/prompt \
  -H "Content-Type: application/json" \
  -H "Accept: text/event-stream" \
  -d '{
    "message": "Write a haiku about coding",
    "options": {
      "token": "your-jwt-token",
      "model": "claude-sonnet-4-5-20250929"
    }
  }'

JavaScript - Fetch with JSON

const response = await fetch('https://conjure.chucky.cloud/prompt', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Accept': 'application/json',
  },
  body: JSON.stringify({
    message: 'Explain quantum computing briefly',
    options: {
      token: 'your-jwt-token',
      model: 'claude-sonnet-4-5-20250929',
    },
  }),
});

const data = await response.json();
console.log(data.result.text);

JavaScript - SSE Streaming

const response = await fetch('https://conjure.chucky.cloud/prompt', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Accept': 'text/event-stream',
  },
  body: JSON.stringify({
    message: 'Write a short story',
    options: { token: 'your-jwt-token' },
  }),
});

const reader = response.body.getReader();
const decoder = new TextDecoder();

while (true) {
  const { done, value } = await reader.read();
  if (done) break;

  const chunk = decoder.decode(value);
  const lines = chunk.split('\n');

  for (const line of lines) {
    if (line.startsWith('data: ')) {
      const data = JSON.parse(line.slice(6));
      if (data.type === 'assistant' && data.subtype === 'text') {
        process.stdout.write(data.text);
      }
    }
  }
}

Python - Requests

import requests

response = requests.post(
    'https://conjure.chucky.cloud/prompt',
    headers={
        'Content-Type': 'application/json',
        'Accept': 'application/json',
    },
    json={
        'message': 'What is the meaning of life?',
        'options': {
            'token': 'your-jwt-token',
        },
    },
)

data = response.json()
print(data['result']['text'])

Usage API

Check current token usage against budget limits.

Endpoint

GET https://conjure.chucky.cloud/usage

Request

Headers

Header	Required	Description
`Authorization`	Yes	Bearer token: `Bearer your-jwt-token`

Response

{
  "user_id": "demo-user",
  "issuer_id": "jd77az049xjwsv0pbjqbrkfjws7z5136",
  "window": "day",
  "window_start": "2026-01-14T00:00:00.000Z",
  "allowed": true,
  "ai": {
    "used": 150000,
    "remaining": 4850000,
    "budget": 5000000
  },
  "compute": {
    "used": 84,
    "remaining": 359916,
    "budget": 360000
  }
}

Response Fields

Field	Type	Description
`user_id`	`string`	User ID from token (`sub` claim)
`issuer_id`	`string`	Project ID from token (`iss` claim)
`window`	`string`	Budget window: `hour`, `day`, `week`, `month`, or `lifetime`
`window_start`	`string`	ISO timestamp when current window started
`allowed`	`boolean`	Whether the user can continue (within budget)
`ai.used`	`number`	AI cost used in microdollars
`ai.remaining`	`number`	AI cost remaining in microdollars
`ai.budget`	`number`	Total AI budget in microdollars
`compute.used`	`number`	Compute time used in seconds
`compute.remaining`	`number`	Compute time remaining in seconds
`compute.budget`	`number`	Total compute budget in seconds

AI cost is tracked in microdollars (1 USD = 1,000,000 microdollars). Compute time is tracked in seconds.

Examples

cURL

curl -H "Authorization: Bearer your-jwt-token" \
  https://conjure.chucky.cloud/usage

JavaScript

const response = await fetch('https://conjure.chucky.cloud/usage', {
  headers: {
    'Authorization': `Bearer ${token}`
  }
});

const usage = await response.json();

// Check remaining budget
console.log(`AI remaining: $${usage.ai.remaining / 1_000_000}`);
console.log(`Compute remaining: ${usage.compute.remaining}s`);

if (!usage.allowed) {
  console.log('Budget exhausted!');
}

Python

import requests

response = requests.get(
    'https://conjure.chucky.cloud/usage',
    headers={'Authorization': f'Bearer {token}'}
)

usage = response.json()
print(f"AI remaining: ${usage['ai']['remaining'] / 1_000_000:.2f}")
print(f"Compute remaining: {usage['compute']['remaining']}s")

Comparison: REST vs WebSocket

Feature	REST `/prompt`	WebSocket `/ws`
Multi-turn conversations	No	Yes
Session persistence	No	Yes
Streaming	SSE only	Full duplex
Client-side tools	Limited	Full support
Best for	Simple one-shot queries	Interactive apps

​REST API

​Endpoint

​Request

​Headers

​Body

​Options

​Response Formats

​JSON Response (Default)

​SSE Response (Streaming)

​Error Responses

​Authentication Errors

​Budget Exceeded

​Concurrency Limit

​Developer Budget Exceeded

​Examples

​cURL - JSON Response

​cURL - SSE Streaming

​JavaScript - Fetch with JSON

​JavaScript - SSE Streaming

​Python - Requests

​Usage API

​Endpoint

​Request

​Headers

​Response

​Response Fields

​Examples

​cURL

​JavaScript

​Python

​Comparison: REST vs WebSocket

REST API

Endpoint

Request

Headers

Body

Options

Response Formats

JSON Response (Default)

SSE Response (Streaming)

Error Responses

Authentication Errors

Budget Exceeded

Concurrency Limit

Developer Budget Exceeded

Examples

cURL - JSON Response

cURL - SSE Streaming

JavaScript - Fetch with JSON

JavaScript - SSE Streaming

Python - Requests

Usage API

Endpoint

Request

Headers

Response

Response Fields

Examples

cURL

JavaScript

Python

Comparison: REST vs WebSocket