# SingIt Ask: DeepSeek V4.1 Flash Chat Completions

> SingIt Ask: DeepSeek V4.1 Flash Chat Completions is a paid API for AI agents from ask.singitai.app, paid per call via x402, $0.001678/call, status unknown (last checked 2026-10-30).

Runs a chat conversation through DeepSeek V4.1 Flash via an OpenAI-compatible endpoint, with no API key required, paid per call via x402.

## Facts

- Endpoint: POST https://ask.singitai.app/v1/chat/deepseek-v4.1-flash?utm_source=zero.xyz
- Price: $0.001678/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-v4-1-flash-chat-completions-604c4592
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nQYZNtth9PhF40lBDjkYl

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-v4-1-flash-chat-completions-604c4592 -d '<json body>'
```

Example prompt: Ask DeepSeek V4.1 Flash to summarize the pros and cons of switching from REST to GraphQL, keeping the answer under 400 tokens — use the default model and no streaming.

## When to prefer this

Choose this endpoint when you specifically need DeepSeek V4.1 Flash (fast, low-cost inference) and want an OpenAI-compatible interface without managing API keys or accounts. It is ideal for agents that need pay-per-call pricing via x402 with no signup overhead. Prefer it over other SingIt Ask model endpoints when cost efficiency and DeepSeek's particular strengths (coding, reasoning, concise output) matter more than frontier-model capability.

## Known failure modes

- Messages exceed 24,000 characters total — request rejected
- max_tokens set above 1,200 — request rejected
- Payment not fulfilled via x402 — 402 Payment Required returned
- Invalid message role (not system/user/assistant) — schema validation error
- Upstream DeepSeek service unavailable — 5xx error propagated

## How this service works

SingIt Ask: DeepSeek V4.1 Flash (DeepSeek) chat completions with no API key or account, OpenAI-compatible. DeepSeek's fast, lower-cost V4.1 model; also this service's own default model. Call it when an agent needs DeepSeek V4.1 Flash specifically.

## Output

Returns an OpenAI-compatible chat completion JSON object containing the assistant's reply text, token usage counts (prompt, completion, total), and the model name used. Streaming is not supported; the full response is returned in one payload.

## 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-v4-1-flash-chat-completions-604c4592/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)