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x402engine KAT-Coder-Pro v2.5 LLM
x402
x402engine KAT-Coder-Pro v2.5 LLM is a paid API for AI agents from x402engine.app, paid per call via x402, $0.006508/call, status unknown (last checked 2026-10-12).
Runs the KAT-Coder-Pro v2.5 coding-specialized language model via pay-per-call HTTP 402 micropayment, returning OpenAI-compatible chat completions
Price / call$0.006508
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 response with the model name ('kwaipilot/kat-coder-pro-v2.5'), an array of choices each containing an assistant message with role and content, a finish_reason ('stop', 'tool_calls', etc.), and optionally tool_calls. When stream=true, returns live Server-Sent Events (SSE) in OpenAI format. The top-level 'content' field is also echoed for convenience.
Example use cases
Automated code review bot
“Send this JavaScript function to KAT-Coder-Pro v2.5 and ask it to review the logic for bugs, suggest improvements, and rewrite it in a cleaner style: [paste code here]”
Tool-augmented coding agent
“Use KAT-Coder-Pro v2.5 with my search_docs and run_tests function tools to generate a Rust implementation of a binary search tree, then call run_tests to verify it compiles.”
Streaming code generation for IDE plugin
“Stream a TypeScript class from KAT-Coder-Pro v2.5 that implements a rate limiter using a sliding window algorithm — I need the tokens to arrive live so I can show them incrementally in the editor.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/kat-coder-pro-v2.5?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a coding-specialized LLM (KAT-Coder-Pro v2.5) without a subscription, paying only $0.006508 USDC per call via HTTP 402. It is ideal for agents that need OpenAI-compatible chat completions, tool/function calling, and optional streaming, especially for code generation, review, or debugging tasks where a purpose-built coding model outperforms general LLMs.
Side effects
- Payment not settled via HTTP 402 — request rejected before reaching the model
- Messages array missing or malformed — 422 validation error
- Model context length exceeded — finish_reason set to 'length'
- Tool schema invalid — function definitions not accepted
- Streaming connection dropped mid-response — partial SSE received
- Unsupported sampling parameters for this model variant — silently ignored or errored per /docs/llm-capabilities.md
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "kwaipilot/kat-coder-pro-v2.5",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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