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x402engine Claude Opus 5 LLM API
x402
x402engine Claude Opus 5 LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.070034/call, status unknown (last checked 2026-10-30).
Calls Anthropic's Claude Opus 5 model with a 1M-token context window for complex coding, analysis, and autonomous agentic tasks via pay-per-call micropayment
Price / call$0.070034
Success—
StatusUnknown
How this service works
x402engine — Anthropic's flagship model with 1M context for coding, analysis, and autonomous work
Output
Returns the generated text completion from Claude Opus 5 based on the provided message array, constrained by the max_tokens parameter. The response reflects Claude's full reasoning and generation capability on the given prompt.
Example use cases
Long-document legal contract analysis
“I have a 200-page legal contract — can you send it to Claude Opus 5 and ask it to summarize the key obligations, risks, and deadlines? Use up to 4096 tokens for the response.”
Autonomous multi-step coding task
“Use Claude Opus 5 to write a complete REST API in Python with authentication, database models, and unit tests based on this spec I'm providing — give it 3000 tokens to respond.”
Complex research synthesis
“Feed Claude Opus 5 these five research papers I've compiled and have it synthesize the main findings, contradictions, and open questions into a structured report, up to 2048 tokens.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/claude-opus-5?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need Claude Opus 5's top-tier reasoning and 1M-context capability without committing to an Anthropic API subscription — ideal for agents making sporadic, high-value calls. Prefer it over GPT-based alternatives when your task specifically benefits from Claude's coding or long-context strengths, or when you want Anthropic's model accessed via x402 micropayment infrastructure without key management overhead.
Side effects
- Payment not included or insufficient USDC (HTTP 402 returned, request rejected)
- Messages array is empty or missing required role/content fields (validation error)
- max_tokens exceeds model limits (generation truncated or error returned)
- Upstream Anthropic API unavailability causes timeout or 5xx error
- Malformed bodyType or method enum causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "anthropic/claude-opus-5",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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