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Model Access Gateway – GPT-6 Astra Chat Completions (x402)
x402
Model Access Gateway – GPT-6 Astra Chat Completions (x402) is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.0019/call, status unknown (last checked 2026-10-15).
Provides OpenAI-compatible chat completions via the GPT-6 Astra model, billed per-request in USDC on Base using the x402 payment protocol — no API key or account required.
Price / call$0.0019
Success—
StatusUnknown
How this service works
GPT-6 Astra API (openai/gpt-6-astra): LLM inference via OpenAI-compatible chat completions, pay per call in USDC on Base with x402. No API key, no account. Suited for AI agents and scripts that need GPT-6 Astra on demand. When listed, this request cost 5% less than the same request on BlockRun. Streaming and function calling supported. Exact price in the 402 quote before payment; automatic refund if the model fails to answer.
Output
Returns an OpenAI-compatible chat.completion JSON object containing the assistant's reply message, finish reason, model name, and token usage breakdown (prompt, completion, and total tokens).
Example use cases
Autonomous agent LLM calls with crypto billing
“I'm building an autonomous agent that needs to call a chat LLM for every task step — use the GPT-6 Astra endpoint that charges per request in USDC so I don't have to manage API subscriptions.”
On-chain AI chatbot for a dApp
“My dApp needs to answer user questions using an AI model and pay for each inference with USDC on Base — route my chat messages through GPT-6 Astra with x402 micropayments.”
No-account LLM prototyping
“I want to try out a GPT-style chat completion model right now without creating an account or getting an API key — just send my prompt to GPT-6 Astra and bill me a tiny USDC amount per call.”
Technical details
Endpoint
POSThttps://agent402-arb.rosariovitale0096.workers.dev/llm/gpt-6-astra?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need OpenAI-compatible chat completions without creating an account or managing API keys, and you can pay per-request in USDC via the x402 protocol on Base. It is especially well-suited for autonomous AI agents that need to self-fund LLM calls on-chain, or for developers prototyping without a subscription commitment.
Side effects
- Payment failure or insufficient USDC balance — x402 payment rejected before inference runs
- Invalid or malformed request body — missing required fields such as messages array
- Model not available or overloaded — upstream provider error propagated through the gateway
- Unsupported HTTP method — only POST/PUT/PATCH accepted
- Rate limiting or worker capacity errors from the Cloudflare Workers runtime
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Optional: fixed by the route (openai/gpt-6-astra) |
| 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": "openai/gpt-6-astra",
"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
}
}Tags
x402
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