# AgentRXI Qwen3.8 Chat Completion

> AgentRXI Qwen3.8 Chat Completion is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.015126/call, status unknown (last checked 2026-10-15).

Pay-per-call LLM chat completion using Qwen3.8-27B, no API key required, billed per call in USDC via x402

## Facts

- Endpoint: GET https://agentrxi.com/v1/qwen3.8/chat/completions?utm_source=zero.xyz
- Price: $0.015126/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentrxi-qwen3-8-chat-completion-99b82380
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9-njXb85upPLuEX1AQDrO

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 agentrxi-qwen3-8-chat-completion-99b82380
```

Example prompt: Ask Qwen3.8 to summarize the following paragraph in three bullet points and keep the response under 200 tokens: 'Quantum computing leverages quantum mechanical phenomena such as superposition and entanglement to perform computations that classical computers find intractable, potentially revolutionizing fields like cryptography, drug discovery, and optimization.'

## When to prefer this

Choose this endpoint when you need a capable mid-size LLM (27B parameters) for general reasoning, summarization, translation, or Q&A without the overhead of API key registration, and you want per-call USDC billing via x402 micropayments. Prefer it over heavier endpoints like Llama 70B when cost and latency matter more than maximum reasoning depth, and over embedding or moderation endpoints when you need free-form text generation.

## Known failure modes

- Payment not received or insufficient USDC balance — 402 Payment Required
- Prompt parameter missing — 400 Bad Request
- Rate limiting or capacity issues — 429 Too Many Requests
- Model inference timeout for very long prompts — 504 Gateway Timeout
- Invalid temperature or max_tokens values — 400 validation error

## How this service works

OpenAI-compatible chat completions on Alibaba Qwen 3.8 27B, the newest Qwen with reasoning, tool calling and a 262K context. Set your OpenAI SDK base URL to https://agentrxi.com/v1/qwen3.8 and pay per token with x402 instead of an API key: $0.9 per million input and $6.4 per million output tokens, minimum $0.002 a call, at most $0.1039. The 402 quotes your request's maximum; "upto" payers are charged only the tokens used. Same request/response shape as OpenAI (tool calling, r

## Output

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

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "prompt"
     ],
     "properties": {
      "prompt": {
       "type": "string",
       "description": "User message"
      },
      "system": {
       "type": "string",
       "description": "Optional system message"
      },
      "max_tokens": {
       "type": "integer"
      },
      "temperature": {
       "type": "number"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-...",
  "model": "qwen3.8-27b",
  "usage": {
   "total_tokens": 18,
   "prompt_tokens": 14,
   "completion_tokens": 4
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Bonjour !"
    },
    "finish_reason": "stop"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentrxi-qwen3-8-chat-completion-99b82380/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentrxi.com](https://www.zero.xyz/host/agentrxi.com/llms.txt)