# SingIt Ask: DeepSeek V4 Pro Chat Completions

> SingIt Ask: DeepSeek V4 Pro Chat Completions is a paid API for AI agents from ask.singitai.app, paid per call via x402, $0.0015/call, status unknown (last checked 2026-10-30).

Proxies chat completions to DeepSeek's V4 Pro model (optimized for coding and reasoning) via an OpenAI-compatible API, requiring no API key or account, paid per-call with USDC.

## Facts

- Endpoint: POST https://ask.singitai.app/v1/chat/deepseek-v4-pro?utm_source=zero.xyz
- Price: $0.0015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/singit-ask-deepseek-v4-pro-chat-completions-d1fdbe67
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gubcF1qb4yrtg_0JWcUkF

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 singit-ask-deepseek-v4-pro-chat-completions-d1fdbe67 -d '<json body>'
```

Example prompt: Use DeepSeek V4 Pro to review this Python function and suggest optimizations — here's my conversation so far: [system: 'You are a senior software engineer', user: 'Here is my code: def fib(n): return fib(n-1)+fib(n-2)'] — keep the answer under 800 tokens.

## When to prefer this

Choose this endpoint when you specifically need DeepSeek V4 Pro's stronger coding and reasoning capabilities over lighter models like DeepSeek V4.1 Flash, and when you want to avoid creating a DeepSeek account or managing API keys. Ideal for pay-per-call agent pipelines where you need a powerful reasoning model on demand. Prefer it over the Flash variant for complex multi-step problems, detailed code generation, or tasks where reasoning depth matters more than speed or cost.

## Known failure modes

- Message content exceeds 24000 character limit — request rejected
- max_tokens set above 1200 — validation error
- Empty messages array or missing required role/content fields — schema validation error
- Payment failure or insufficient USDC balance — 402 payment required response
- Model id not found in /v1/models — model not available error
- Rate limiting or upstream DeepSeek API unavailability — 503 or timeout

## How this service works

SingIt Ask: DeepSeek V4 Pro (DeepSeek) chat completions with no API key or account, OpenAI-compatible. DeepSeek's larger V4 model: coding and reasoning tasks. Call it when an agent needs DeepSeek V4 Pro specifically.

## Output

A JSON object in OpenAI chat completion format containing the assistant's generated message, usage statistics (prompt tokens, completion tokens, total tokens), model identifier, and finish reason. No streaming — the full response is returned at once.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "examples": [
    "deepseek-v4.1-flash",
    "claude-opus-5.5",
    "gpt-5.5",
    "gemini-3.1-pro"
   ],
   "description": "Any model id from GET /v1/models; the ceiling follows its price. Omit for the default model."
  },
  "stream": {
   "enum": [
    false
   ],
   "type": "boolean",
   "description": "Streaming is not offered."
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant"
      ],
      "type": "string"
     },
     "content": {
      "type": "string",
      "description": "Plain text; all messages together under 24000 characters."
     }
    }
   },
   "maxItems": 40,
   "minItems": 1,
   "description": "The conversation, oldest first."
  },
  "max_tokens": {
   "type": "integer",
   "default": 800,
   "maximum": 1200,
   "minimum": 1,
   "description": "The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/singit-ask-deepseek-v4-pro-chat-completions-d1fdbe67/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ask.singitai.app](https://www.zero.xyz/host/ask.singitai.app/llms.txt)