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x402engine Claude Opus 4.8 LLM API
x402
x402engine Claude Opus 4.8 LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.070034/call, status unknown (last checked 2026-10-12).
Call Anthropic's Claude Opus 4.8 model via a pay-per-call HTTP 402 micropayment endpoint, returning OpenAI-compatible chat completions
Price / call$0.070034
Success—
StatusUnknown
How this service works
125 production APIs behind HTTP 402 micropayments. 87 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.
Output
Returns an OpenAI-compatible JSON object containing the model name ('anthropic/claude-opus-4.8'), a choices array with the assistant message (role, content, finish_reason), and optionally streamed SSE chunks if stream=true. Tool call arrays are included when the model invokes client-defined functions.
Example use cases
Agent reasoning with tool calls
“Send this conversation history to Claude Opus 4.8 with my search_web and run_code function definitions, and let it decide which tools to call to answer the user's question about recent stock prices.”
Document summarization with PDF input
“Run this uploaded PDF annual report through Claude Opus 4.8 and ask it to extract the five most important financial highlights in bullet points.”
Streaming creative writing assistant
“Have Claude Opus 4.8 continue my sci-fi story from where I left off — stream the response so I can read it as it comes in — the story so far is in the messages I'm sending.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/claude-opus-4.8?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need Anthropic's Claude Opus 4.8 specifically — one of the highest-capability frontier models — without provisioning an Anthropic API key or managing billing accounts. Ideal for agents that need pay-per-call crypto micropayments (USDC on Base/Solana or USDm on MegaETH), support OpenAI-compatible message formats, and want tool/function calling, streaming, image input, or PDF parsing in a single endpoint. Prefer over generic OpenAI-compatible proxies when Claude's reasoning style or constitutional training is important to the task.
Side effects
- 402 Payment Required if USDC balance is insufficient or payment settlement fails
- 400 Bad Request if the messages array is missing or malformed
- 413 if content exceeds model context window
- Streaming may be interrupted if network drops after payment settlement
- Tool call format errors if function definitions do not conform to OpenAI function schema
- Model unavailability or upstream Anthropic outage returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "anthropic/claude-opus-4.8",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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