Multi-model AI Gateway (agent402-arb)

x402

Multi-model AI Gateway (agent402-arb) is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.0014/call, status unknown (last checked 2026-10-14).

Routes OpenAI-compatible chat completion requests to a wide catalog of frontier AI models, billed per-call in USDC via x402 on Base/Arbitrum.

Price / call$0.0014

Seller volume →—

Success—

StatusUnknown

How this service works

LLM inference API: OpenAI-compatible chat completions for 100+ AI models (DeepSeek, GPT, Claude, Gemini, Grok, GLM, Qwen, Kimi, Llama, Mistral). Suited for AI agents that need on-demand text generation, coding or tool calling paid per request in USDC on Base with x402: no account, no API key. Model in body.model (GET /v1/models); streaming supported. Exact price in the 402 quote; automatic refund if the model fails.

Output

Returns an OpenAI-compatible chat completion object containing the assistant's reply message, the model used, token usage counts (prompt, completion, total), and finish reason. The response mirrors the standard /v1/chat/completions schema so it can be dropped into any OpenAI-compatible client.

Example use cases

Comparing answers across frontier models

“Ask 'What are the top 3 risks of AGI development?' to both openai/gpt-4o and anthropic/claude-sonnet-4.5 using the pay-per-call gateway, then show me both responses side by side.”

Cost-efficient coding assistant

“Use openai/gpt-4.1-mini through the USDC inference gateway to review this Python function and suggest improvements — I want the cheapest capable model for code review tasks.”

Reasoning task with DeepSeek

“Send this math problem to deepseek/deepseek-reasoner via the multi-model gateway: 'A train leaves at 60 mph and another at 80 mph from 300 miles apart — when do they meet?' and give me the step-by-step solution.”

Technical details

Endpoint

POSThttps://agent402-arb.rosariovitale0096.workers.dev/v1/chat/completions?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need pay-per-call access to a broad catalog of frontier models (Claude, GPT, Gemini, Grok, DeepSeek, Mistral, Qwen and more) without committing to individual provider subscriptions, and when your agent operates in a crypto-native environment capable of x402 USDC payments on Base or Arbitrum. It is especially useful when you want to switch models dynamically per request or compare outputs across providers from a single unified API surface.

Side effects

Insufficient USDC balance — x402 payment fails before inference runs
Invalid model ID — returns error if model string not in current /models catalog (catalog may drift from schema enum)
Model unavailable — upstream provider outage causes 5xx from the gateway
Malformed messages array — missing required role/content fields returns 400
Stream=true not supported — schema enforces const:false, streaming requests rejected
Rate limits — upstream provider throttling may cause transient 429s

Input

Schema · Request body

Field	Type	Description
model	string	Choose any current model; GET /v1/models for the live catalog.
tools	array
stream	boolean	true: server-sent events after payment
messages	array
max_tokens	integer	Optional, default 4096
temperature	number
response_format	object

Output

Schema · Response

{
  "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
  }
}

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