curl --request POST \
  --url https://api.iotools.cloud/v1/tool/llm-token-count-estimator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "inputText": "Hello, world!",
  "model": "gpt-4o",
  "outputTokens": "500"
}
'

{
  "tool": "llm-token-count-estimator",
  "tool_version": "1.0.1",
  "outputs": {
    "stats": [
      {
        "metric": "Est. tokens",
        "value": "4"
      },
      {
        "metric": "Words",
        "value": "2"
      },
      {
        "metric": "Characters",
        "value": "13"
      },
      {
        "metric": "Characters (no spaces)",
        "value": "12"
      },
      {
        "metric": "Tokens / word",
        "value": "2.00"
      },
      {
        "metric": "Chars / token",
        "value": "3.25"
      }
    ],
    "contextHtml": "<div style=\"background:#f8f9fa;border-radius:8px;padding:16px\"><div style=\"display:flex;justify-content:space-between;font-size:0.85rem;margin-bottom:8px\"><span><strong>GPT-4o</strong> context window</span><span><strong style=\"color:#464aff\"><0.01%</strong> &middot; 4 / 128,000 tokens</span></div><div style=\"height:14px;background:#e9ecef;border-radius:7px;overflow:hidden\"><div style=\"height:100%;background:#464aff;width:0.003%;border-radius:7px\"></div></div><div style=\"margin-top:8px;font-size:0.78rem;color:#6c757d\">Remaining: 127,996 tokens</div></div>",
    "costTable": [
      {
        "model": "→ GPT-4o",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      },
      {
        "model": "GPT-4o mini",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      },
      {
        "model": "GPT-4 Turbo",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "$0.0150",
        "total": "$0.0150"
      },
      {
        "model": "GPT-4",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "$0.0300",
        "total": "$0.0301"
      },
      {
        "model": "GPT-3.5 Turbo",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      },
      {
        "model": "o1",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "$0.0300",
        "total": "$0.0301"
      },
      {
        "model": "o1-mini",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      },
      {
        "model": "Claude 3.5 Sonnet",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      },
      {
        "model": "Claude 3 Opus",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "$0.0375",
        "total": "$0.0376"
      },
      {
        "model": "Claude 3 Haiku",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      },
      {
        "model": "Gemini 1.5 Pro",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      },
      {
        "model": "Gemini 1.5 Flash",
        "input-tokens": "4",
        "input-cost": "<$0.01",
        "output-cost": "<$0.01",
        "total": "<$0.01"
      }
    ],
    "vizHtml": "<div style=\"font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:0.88rem;line-height:1.8;white-space:pre-wrap;word-break:break-word\"><span style=\"background:rgba(70,74,255,0.18);border-radius:3px;padding:1px 0\">Hell</span><span style=\"background:rgba(139,92,246,0.18);border-radius:3px;padding:1px 0\">o</span><span style=\"background:rgba(14,165,233,0.18);border-radius:3px;padding:1px 0\">,</span><span style=\"background:rgba(16,185,129,0.18);border-radius:3px;padding:1px 0\"> worl</span><span style=\"background:rgba(245,158,11,0.18);border-radius:3px;padding:1px 0\">d</span><span style=\"background:rgba(236,72,153,0.18);border-radius:3px;padding:1px 0\">!</span></div><div style=\"font-size:0.78rem;color:#6c757d;margin-top:8px\">Colors alternate per token. Counts are heuristic estimates, not exact tiktoken output.</div>"
  },
  "credits_used": 3,
  "credits_remaining": null
}