# x402donghang DeepSeek-V4-Pro Chat Completions

> x402donghang DeepSeek-V4-Pro Chat Completions is a paid API for AI agents from x402donghang.duckdns.org, paid per call via x402, $0.008/call, status down (last checked 2026-10-19).

Pay-per-call OpenAI-compatible chat completions endpoint powered by DeepSeek-V4-Pro, billed at $0.008 USDC per call via x402 micropayments on Base or Solana.

## Facts

- Endpoint: POST https://x402donghang.duckdns.org/x402/v1/models/deepseek-v4-pro/chat/completions?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: down
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402donghang-deepseek-v4-pro-chat-completions-8b3081ac
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C58ShGXz3KZAQDKNbZcX9

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 x402donghang-deepseek-v4-pro-chat-completions-8b3081ac -d '<json body>'
```

Example prompt: Send a message to DeepSeek-V4-Pro asking it to explain how zero-knowledge proofs work in simple terms, paying per call with USDC — no account needed.

## When to prefer this

Choose this endpoint when you need a no-signup, pay-per-call chat completions API using DeepSeek-V4-Pro specifically, billed in micro-amounts of USDC via x402. Ideal for agent pipelines that want to avoid subscription overhead or API key management, or when testing DeepSeek inference on a per-call basis. Not ideal if you need guaranteed SLA, high-volume throughput, or a provider with enterprise support.

## Known failure modes

- Payment not included or insufficient USDC — returns HTTP 402 Payment Required
- Invalid model name (must be exactly 'deepseek-v4-pro') — may return 400 or model-not-found error
- Malformed messages array (missing required 'role' or 'content' fields) — returns 400 Bad Request
- max_tokens too large — may be truncated or rejected depending on model limits
- Service unavailable or cold-start latency on duckdns host — returns 502 or timeout
- Streaming mode errors if client does not support SSE parsing

## How this service works

Fresh crypto narrative research with market context and verifiable source URLs. Free BTC sample; custom radar $0.02/call via x402 USDC.

## Output

Returns a JSON chat completion object with an OpenAI-compatible structure: a unique completion ID, the model name ('deepseek-v4-pro'), an object type of 'chat.completion', and a choices array containing the assistant's reply message, its role, and a finish_reason indicating why generation stopped (e.g. 'stop').

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Use \"deepseek-v4-pro\""
  },
  "stream": {
   "type": "boolean"
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "type": "string"
     },
     "content": {
      "type": "string"
     }
    }
   }
  },
  "max_tokens": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-x402",
  "model": "deepseek-v4-pro",
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Hello!"
    },
    "finish_reason": "stop"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402donghang-deepseek-v4-pro-chat-completions-8b3081ac/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402donghang.duckdns.org](https://www.zero.xyz/host/x402donghang.duckdns.org/llms.txt)