# Agent Inference — GPT-5 Mini over x402

> Agent Inference — GPT-5 Mini over x402 is a paid API for AI agents from inference.52-246-250-144.sslip.io, paid per call via x402, $0.005/call, status down (last checked 2026-10-13).

Provides keyless GPT-5 Mini chat completions via HTTP 402 micropayment at $0.005 USDC per call

## Facts

- Endpoint: POST https://inference.52-246-250-144.sslip.io/v1/ai/chat/completions?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-inference-gpt-5-mini-over-x402-4eca4312
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AsbkZcZVCkO9EVQkXOcRm

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 agent-inference-gpt-5-mini-over-x402-4eca4312 -d '<json body>'
```

Example prompt: Ask GPT-5 Mini to explain what the x402 payment protocol is — keep the reply under 100 words, paying $0.005 USDC per call.

## When to prefer this

Choose this endpoint when you need GPT-5 Mini chat completions without managing API keys or subscriptions, paying only $0.005 USDC per call via the x402 micropayment protocol. It is ideal for autonomous agents, serverless pipelines, or low-volume use cases where per-call billing is preferable to monthly commitments. Prefer this over traditional OpenAI API access when operating in trustless or keyless environments where USDC micropayments are the payment primitive.

## Known failure modes

- Payment failure: x402 payment not included or USDC balance insufficient — returns 402 Payment Required
- Invalid model: model field not set to 'gpt-5-mini' — returns 400 validation error
- Message limit exceeded: more than 24 messages or content over 4000 chars — returns 400 validation error
- Token limit exceeded: max_tokens or max_completion_tokens above 512 — returns 400 validation error
- Empty messages array: minItems:1 not satisfied — returns 400 validation error
- Service unavailability: inference backend unreachable — returns 502 or 503

## How this service works

Keyless GPT-5 Mini chat completions for $0.005 USDC per call through x402.

## Output

Returns a standard OpenAI-compatible chat completion JSON object containing the assistant's reply message, finish reason (e.g. 'stop'), token usage breakdown (prompt, completion, total), a completion ID, model name, and creation timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "model": {
   "enum": [
    "gpt-5-mini"
   ],
   "type": "string",
   "description": "Public model identifier"
  },
  "stream": {
   "type": "boolean",
   "const": false
  },
  "messages": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "role",
     "content"
    ],
    "properties": {
     "role": {
      "enum": [
       "system",
       "user",
       "assistant"
      ],
      "type": "string"
     },
     "content": {
      "type": "string",
      "maxLength": 4000,
      "minLength": 1
     }
    },
    "additionalProperties": false
   },
   "maxItems": 24,
   "minItems": 1
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 512,
   "minimum": 1
  },
  "max_completion_tokens": {
   "type": "integer",
   "maximum": 512,
   "minimum": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "chatcmpl-example",
  "model": "gpt-5-mini",
  "usage": {
   "total_tokens": 18,
   "prompt_tokens": 10,
   "completion_tokens": 8
  },
  "object": "chat.completion",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "HTTP 402 enables machine-payable resources."
    },
    "finish_reason": "stop"
   }
  ],
  "created": 1700000000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-inference-gpt-5-mini-over-x402-4eca4312/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from inference.52-246-250-144.sslip.io](https://www.zero.xyz/host/inference.52-246-250-144.sslip.io/llms.txt)