# Model Access Gateway – DeepSeek Chat (deepseek/deepseek-chat) via x402

> Model Access Gateway – DeepSeek Chat (deepseek/deepseek-chat) via x402 is a paid API for AI agents from modelaccessgateway.com, paid per call via x402, $0.0014/call, status unknown (last checked 2026-10-18).

Runs OpenAI-compatible chat completions using DeepSeek Chat, paid per call in USDC on Base via x402, with no API key or account required.

## Facts

- Endpoint: POST https://modelaccessgateway.com/v1/chat/completions/deepseek%2Fdeepseek-chat?utm_source=zero.xyz
- Price: $0.0014/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/model-access-gateway-deepseek-chat-deepseek-deepseek-chat-via-x402-9a14ccb9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5dVlUeZvmsr-jHEvZ6rGm

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 model-access-gateway-deepseek-chat-deepseek-deepseek-chat-via-x402-9a14ccb9 -d '<json body>'
```

Example prompt: Ask DeepSeek Chat to write me a concise technical explanation of how transformer attention works, using up to 512 tokens, and pay per call with USDC — no API key setup needed.

## When to prefer this

Choose this endpoint when you need DeepSeek Chat specifically and want zero-friction access — no account signup, no API key management, and automatic per-call USDC billing on Base. Ideal for autonomous agents, ephemeral scripts, or privacy-conscious workflows where provisioning credentials is undesirable. Prefer this over OpenAI or Anthropic direct APIs when you want crypto-native micropayment billing with automatic refunds on failure.

## Known failure modes

- Insufficient USDC balance triggers a 402 Payment Required before inference runs
- Model failure triggers automatic refund with no charge
- Invalid messages array (empty or missing role) returns a 400 validation error
- Exceeding max_tokens limit of 16384 results in a parameter error
- Network timeout on long completions may leave payment state ambiguous

## 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 message text, finish reason (e.g. 'stop'), token usage counts (prompt, completion, total), model name, and a unique completion ID. If streaming is enabled, server-sent events are returned instead.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "type": "string",
   "description": "Optional: fixed by the route (deepseek/deepseek-chat)"
  },
  "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-chat",
  "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/model-access-gateway-deepseek-chat-deepseek-deepseek-chat-via-x402-9a14ccb9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from modelaccessgateway.com](https://www.zero.xyz/host/modelaccessgateway.com/llms.txt)