Reference

curl -s https://api.genmux.tech/v1/account -H "Authorization: Bearer $API_KEY"

{
  "id": "…",
  "name": "…",
  "balance": 498,
  "inflight": 1,
  "max_inflight": 20,
  "key": {"prefix": "nb_live_AbCdEfGh", "rate_limit_rps": 10}
}

curl -s https://api.genmux.tech/v1/models

{
  "object": "list",
  "data": [
    {
      "id": "nanobanana",
      "object": "model",
      "created": 1756411279,
      "owned_by": "genmux",
      "display_name": "Nano Banana",
      "description": "Fast text-to-image and image-to-image at 1K.",
      "capability": "image.generate",
      "status": "active",
      "params_schema": {
        "resolutions": ["1K"],
        "ratios": ["auto", "1:1", "16:9", "9:16", "4:3", "3:4", "3:2", "2:3", "5:4", "4:5", "21:9"],
        "max_n": 4,
        "seed": true,
        "max_images": 14,
        "negative_prompt": true,
        "max_prompt": 2000
      },
      "default_params": {"resolution": "1K", "ratio": "1:1", "n": 1},
      "prices": {"image:1K": 2},
      "available": true
    },
    {
      "id": "nanobanana-pro",
      "object": "model",
      "created": 1756411279,
      "owned_by": "genmux",
      "display_name": "Nano Banana Pro",
      "description": "Higher fidelity, with 1K, 2K and 4K output.",
      "capability": "image.generate",
      "status": "active",
      "params_schema": {
        "resolutions": ["1K", "2K", "4K"],
        "ratios": ["auto", "1:1", "16:9", "9:16", "4:3", "3:4", "3:2", "2:3", "5:4", "4:5", "21:9"],
        "max_n": 4,
        "seed": true,
        "max_images": 14,
        "negative_prompt": true,
        "max_prompt": 2000
      },
      "default_params": {"resolution": "1K", "ratio": "1:1", "n": 1},
      "prices": {"image:1K": 4, "image:2K": 6, "image:4K": 8},
      "available": true
    },
    {
      "id": "qwen3.8-max",
      "object": "model",
      "created": 1756411279,
      "owned_by": "genmux",
      "display_name": "Qwen3.8-Max",
      "description": "Alibaba Qwen3.8-Max via gateway: flagship Qwen with a 1M-token context.",
      "capability": "text.chat",
      "status": "active",
      "params_schema": {
        "tools": true,
        "context_tokens": 1000000,
        "max_output_tokens": 16384,
        "default_max_tokens": 2048
      },
      "default_params": {
        "max_tokens": 2048,
        "temperature": 0.7
      },
      "prices": {
        "tokens_in:1M": 138.718,
        "tokens_out:1M": 416.161
      },
      "available": true
    }
  ]
}

{"type": "…/errors/insufficient_credits", "title": "Payment Required", "status": 402, "code": "insufficient_credits", "detail": "account balance is too low for this request", "request_id": "…"}

{"error": {"message": "account balance is too low for this request", "type": "insufficient_quota", "code": "insufficient_credits", "param": null, "request_id": "…"}}

Content-Type: application/json
X-Webhook-Id: 1042
X-Webhook-Timestamp: 1756411279
X-Webhook-Signature: v1=3f7a…

{"type": "generation.succeeded", "id": "…", "status": "succeeded", "error_code": null, "created_at": "…", "finished_at": "…"}

import { createHmac, timingSafeEqual } from "node:crypto";

export function verify(secret, headers, rawBody) {
  const ts = headers["x-webhook-timestamp"];
  const expected = createHmac("sha256", secret).update(ts + "." + rawBody).digest("hex");
  return headers["x-webhook-signature"].split(",")
    .some((s) => { const v = s.replace(/^v1=/, ""); return v.length === expected.length && timingSafeEqual(Buffer.from(v), Buffer.from(expected)); });
}