# Model Access Gateway – DeepSeek Chat (x402 Pay-Per-Call)

> Model Access Gateway – DeepSeek Chat (x402 Pay-Per-Call) is a paid API for AI agents from modelaccessgateway.com, paid per call via x402, $0.0014/call, status unknown (last checked 2026-10-16).

Runs a DeepSeek Chat inference call via an OpenAI-compatible chat completions API, billed per call in USDC on Base with no API key required.

## Facts

- Endpoint: POST https://modelaccessgateway.com/llm/deepseek-chat?utm_source=zero.xyz
- Price: $0.0014/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/model-access-gateway-deepseek-chat-x402-pay-per-call-1e15080c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6ema1ciwZEjkeKwBammMQ

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-x402-pay-per-call-1e15080c -d '<json body>'
```

Example prompt: Ask DeepSeek Chat to explain the difference between supervised and unsupervised learning in plain English — pay per call in USDC, no API key needed, and cap the response at 512 tokens.

## When to prefer this

Choose this endpoint when you need DeepSeek Chat specifically (strong coding and reasoning capabilities), want to avoid API key management, need per-call crypto billing in USDC with automatic refunds on failure, or are building autonomous agents that self-fund LLM calls on Base. Prefer it over managed DeepSeek accounts when operating keyless or in decentralized environments.

## Known failure modes

- Payment failure or insufficient USDC balance — call rejected before inference begins
- Model-side error triggers automatic refund — no charge for failed completions
- messages array empty or missing — 400 validation error
- max_tokens out of range (must be 1–16384) — request rejected
- Network timeout during streaming — partial SSE stream
- Unsupported tool schema — may cause unexpected behavior

## 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), model identifier, and a unique completion ID. Streaming mode delivers server-sent events 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-x402-pay-per-call-1e15080c/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)