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Model Access Gateway – Claude Haiku 5.5 via x402
x402
Model Access Gateway – Claude Haiku 5.5 via x402 is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).
Runs OpenAI-compatible chat completions against Anthropic Claude Haiku 5.5, billed per request in USDC on Base via x402 with no account or API key required.
Price / call$0.001
Success—
StatusUnknown
How this service works
Claude Haiku 5.5 API (anthropic/claude-haiku-5.5): 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 Claude Haiku 5.5 on demand. 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-style chat.completion JSON object containing the assistant's message text, model name (anthropic/claude-haiku-5.5), prompt and completion token counts, finish reason, and a completion ID — identical in shape to the OpenAI Chat Completions API response.
Example use cases
Keyless LLM call from autonomous agent
“I need you to ask Claude Haiku 5.5 the following question and return the answer — no API key, just pay with USDC: 'What are the top three risks of deploying smart contracts without an audit?'”
Crypto-native chatbot backend
“Use Claude Haiku 5.5 as the brain for my chatbot — every time a user sends a message, forward it to Claude and stream back the response, paying per call with USDC so I don't need to manage API subscriptions.”
Per-request AI reasoning for onchain app
“My onchain app needs to classify user intents in real time — send each incoming user message to Claude Haiku 5.5, get back the assistant's classification, and charge me $0.001 USDC per call on Base.”
Technical details
Endpoint
POSThttps://agent402-arb.rosariovitale0096.workers.dev/llm/claude-haiku-5.5?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to call Claude Haiku 5.5 with no prior account setup, no API key management, and want to pay strictly per-request in USDC on Base via x402 — ideal for autonomous agents, onchain apps, or serverless workflows that need crypto-native LLM access with an OpenAI-compatible interface.
Side effects
- 402 Payment Required if USDC payment header is missing or insufficient
- Invalid or malformed request body returns 400
- Model unavailable or upstream API error returns 502 or 503
- Insufficient USDC balance on Base causes payment failure
- Rate limiting by the underlying workers.dev infrastructure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Optional: fixed by the route (anthropic/claude-haiku-5.5) |
| 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": "anthropic/claude-haiku-5.5",
"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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