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Model Access Gateway — Claude Haiku 5.5 Chat Completions (x402, USDC)
x402
Model Access Gateway — Claude Haiku 5.5 Chat Completions (x402, USDC) is a paid API for AI agents from modelaccessgateway.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).
Runs an OpenAI-compatible chat completion request against Claude Haiku 5.5 (Anthropic), paid per call in USDC on Base via x402 — no API key or account required.
Price / call$0.001
Success—
StatusUnknown
How this service works
LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.
Output
Returns a standard OpenAI-format chat.completion JSON object containing the assistant's reply text, finish_reason (e.g. 'stop'), prompt/completion/total token counts, a completion ID, model name, and created timestamp. If streaming is enabled, server-sent events are returned after payment is confirmed. If the model call fails, an automatic USDC refund is issued.
Example use cases
Wallet-native agent calling Claude
“I'm building an autonomous agent that holds USDC on Base — have it call Claude Haiku 5.5 to classify incoming support tickets as 'billing', 'technical', or 'general', paying per call without storing any API keys.”
Fast cheap summarization pipeline
“Summarize this product review in one sentence using Claude Haiku: 'The battery lasts all day and the camera is stunning, but the software updates have been buggy and customer support took two weeks to respond.' Keep max tokens at 100.”
Streaming chat in a demo app
“Send a streaming chat request to Claude Haiku 5.5 — the user message is 'Explain how photosynthesis works in simple terms' — and stream the response back to the UI as server-sent events, spending at most $0.001 USDC per call.”
Technical details
Endpoint
POSThttps://modelaccessgateway.com/llm/claude-haiku-5.5?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need Claude Haiku 5.5 specifically, want zero-setup anonymous access (no API key, no account), are operating from a crypto wallet or x402-enabled agent, and want automatic refunds on failure. Prefer it over raw Anthropic API when you cannot or prefer not to manage API credentials, or when your agent architecture already uses x402 micropayments on Base. It is cost-effective at $0.001/call for high-throughput, low-latency tasks like classification, summarization, and short-form generation.
Side effects
- Insufficient USDC balance — payment rejected before inference runs
- Model unavailable or upstream Anthropic error — triggers automatic refund
- Invalid messages array (empty or missing required 'role' field) — validation error
- max_tokens out of range (must be 1–16384) — rejected with parameter error
- Stream response interrupted after payment but before completion — partial SSE stream
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
Reviews
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