# DeepSeek V4.1 Flash Chat Completions via Agent402 (x402)

> DeepSeek V4.1 Flash Chat Completions via Agent402 (x402) is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-15).

Runs OpenAI-compatible chat completions using DeepSeek V4.1 Flash, billed per-request in USDC via x402 with no account or API key required.

## Facts

- Endpoint: POST https://agent402-arb.rosariovitale0096.workers.dev/llm/deepseek-v4.1-flash?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/deepseek-v4-1-flash-chat-completions-via-agent402-x402-c169c211
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3LcgQK7qSUTS3Zd5GP18d

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 deepseek-v4-1-flash-chat-completions-via-agent402-x402-c169c211 -d '<json body>'
```

Example prompt: Using the pay-per-request DeepSeek V4.1 Flash model — no API key needed, just pay in USDC — complete this chat: system says 'You are a helpful assistant' and the user asks 'What is the capital of France?'

## When to prefer this

Choose this endpoint when you need fast, cheap DeepSeek V4.1 Flash inference with no API key or account registration — ideal for autonomous agents that hold USDC on Base and want to pay per call using the x402 protocol. Prefer it over OpenAI or Anthropic APIs when you want crypto-native, permissionless LLM access billed in stablecoin micropayments.

## Known failure modes

- 402 Payment Required if USDC payment is missing or insufficient
- invalid or malformed request body yields a 400 error
- model unavailable or overloaded may return 503
- malformed chat message structure causes schema validation failure
- network timeout on the Cloudflare Worker edge

## How this service works

LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.

## Output

Returns an OpenAI-compatible chat.completion JSON object containing the assistant's reply message, finish reason, token usage breakdown (prompt, completion, total tokens), model name, and a unique completion ID.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Optional: fixed by the route (deepseek/deepseek-v4.1-flash)"
  },
  "tools": {
   "type": "array"
  },
  "stream": {
   "type": "boolean",
   "description": "true: server-sent events after payment"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant",
       "tool",
       "developer"
      ],
      "type": "string"
     },
     "content": {
      "type": [
       "string",
       "array",
       "null"
      ]
     }
    }
   },
   "minItems": 1
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 16384,
   "minimum": 1,
   "description": "Optional, default 4096"
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  },
  "response_format": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-7f3c2a91",
  "model": "deepseek/deepseek-v4.1-flash",
  "usage": {
   "total_tokens": 10,
   "prompt_tokens": 9,
   "completion_tokens": 1
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "OK"
    },
    "finish_reason": "stop"
   }
  ],
  "created": 1791979200
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/deepseek-v4-1-flash-chat-completions-via-agent402-x402-c169c211/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402-arb.rosariovitale0096.workers.dev](https://www.zero.xyz/host/agent402-arb.rosariovitale0096.workers.dev/llms.txt)