# AdFreeLLM Chat Completions (Claude Opus 5)

> AdFreeLLM Chat Completions (Claude Opus 5) is a paid API for AI agents from api.adfreellm.com, paid per call via x402, $0.1/call, status down (last checked 2026-09-15).

Sends a conversation to Claude Opus 5 via a pay-per-call relay and returns a chat completion response.

## Facts

- Endpoint: POST https://api.adfreellm.com/relay/1787185030319/v1/chat/completions
- Price: $0.1/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/adfreellm-chat-completions-claude-opus-5-c2840242
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3hQLQ-dwz1gtygBIueNHS

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 adfreellm-chat-completions-claude-opus-5-c2840242 -d '<json body>'
```

Example prompt: Ask Claude Opus 5 to explain the trade-offs between microservices and monolithic architectures in plain English, keeping the response under 400 tokens.

## When to prefer this

Choose this endpoint when you need Claude Opus 5 specifically — Anthropic's most capable model — on a pay-per-call basis without managing an Anthropic API subscription. It is ideal for agent workflows that require occasional high-quality reasoning bursts and want to pay per invocation via USDC x402 rather than monthly billing. Prefer this over generic LLM endpoints when task complexity justifies Opus-tier intelligence and you want an OpenAI-compatible response schema.

## Known failure modes

- Invalid or missing 'model' field (must be 'claude-opus-5') returns a 400 validation error
- Missing 'messages' array causes a 400 bad request
- Payment not included or insufficient USDC results in a 402 Payment Required response
- Exceeding the upstream model's context window returns a context length error
- Network timeout on long completions if max_tokens is very large
- Streaming errors if the client disconnects mid-stream

## How this service works

Chat with Gemini 3.6 Flash, DeepSeek V4 Flash and more — 100% free, no credit card, no subscription. Advertisers pay the bill. Pick a model and talk.

## Output

Returns a standard OpenAI-compatible chat completion object including the assistant's text reply, role, finish reason, token counts (prompt, completion, total), a completion ID, and the model name used.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "model",
  "messages"
 ],
 "properties": {
  "model": {
   "enum": [
    "claude-opus-5"
   ],
   "type": "string",
   "description": "Model ID to use for completion"
  },
  "stream": {
   "type": "boolean",
   "description": "Enable streaming response"
  },
  "messages": {
   "type": "array",
   "description": "Array of chat messages"
  },
  "max_tokens": {
   "type": "integer",
   "description": "Maximum tokens to generate"
  },
  "temperature": {
   "type": "number",
   "description": "Sampling temperature 0-2"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "id": {
   "type": "string"
  },
  "model": {
   "type": "string"
  },
  "usage": {
   "type": "object",
   "properties": {
    "total_tokens": {
     "type": "integer"
    },
    "prompt_tokens": {
     "type": "integer"
    },
    "completion_tokens": {
     "type": "integer"
    }
   }
  },
  "object": {
   "enum": [
    "chat.completion"
   ],
   "type": "string"
  },
  "choices": {
   "type": "array",
   "items": {
    "type": "object",
    "properties": {
     "index": {
      "type": "integer"
     },
     "message": {
      "type": "object",
      "properties": {
       "role": {
        "type": "string"
       },
       "content": {
        "type": "string"
       }
      }
     },
     "finish_reason": {
      "type": "string"
     }
    }
   }
  },
  "created": {
   "type": "integer"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/adfreellm-chat-completions-claude-opus-5-c2840242/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.adfreellm.com](https://www.zero.xyz/host/api.adfreellm.com/llms.txt)