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For AI video creators · ComfyUI · Kling · Runway · Veo · Hailuo · Seedance

Stop burning credits on broken AI video.

Every black frame, frozen shot and off-model keyframe is money you already paid for. SmartTokenGuard checks each render the moment it lands and tells you whether it's worth paying for the next step, before the credits are gone.

Start saving from US$9/month See what it catches
Calibrated on 250+ real AI video clips · Works inside Claude, Cursor and VS Code · Your files are deleted right after each check

How much are broken renders costing you?

Plug in your own numbers.

Spent on renders you throw away
$25 / month

$300 a year.

Catch a bad keyframe and you skip paying for the clip built on top of it. At your price, Starter pays for itself after 18 skipped renders a month.

See what a check catches

Real results on public AI video benchmark clips, and how a verdict looks inside your assistant.

Black frames and a stalled render flagged on CogVideoX benchmark clips
Flagged automatically: 2.5 s of black frames mid-shot and a 1.25 s stall.
Example session: a keyframe check returns RETRY with exact fixes
Example session: the keyframe fails, so no money is spent on the video until it's fixed.

Where the money leaks

The expensive part is rarely the first render. It's everything you build on a broken one.

Bad keyframe

You pay for image-to-video on a still that was already soft, blown out or off-model. The whole clip is wasted before it starts.

Blind re-rolls

Same prompt, new seed, fingers crossed. Without knowing what broke, every retry costs the same and fails the same way.

Found too late

Black frames or a frozen second show up in the edit, after you've already paid for sound, upscale and the next shots.

Check first. Pay second.

A quick check between every render and the next paid step.

Check the keyframe before image-to-video. A rejected still costs you nothing. A rejected clip costs the full render.
Inspect every clip the moment it renders. Blur, flicker, frozen and black frames, hard cuts and colour drift against your reference, plus review frames so your assistant checks hands and faces.
Get a verdict, not a guess. PASSRETRY_SAME_MODELSWITCH_TO_FALLBACKHALTHALT_BUDGET
Retries come with the exact negative-prompt terms, a lower motion setting and a new seed, so the next attempt is aimed.
Stop the spiral. Set a budget per project and it halts a shot that keeps failing, then shows what you spent and how many renders you skipped.

Catches what costs you

Black frames & freezes

Seconds of black mid-shot or a render that stalls. Flagged instantly, before the clip goes anywhere.

Flicker & blur

Real alternating flicker and soft focus, measured the same way for 16:9, 9:16 and 4K.

Off-model looks

Colour and lighting compared with your reference, so you catch shot 40 drifting away from shot 1.

Hands, faces, identity

Review frames go straight to your AI assistant, which checks them before anything passes.

Impacts & cuts

Exact frames of every hit, flash and cut, ready for placing sound effects.

Spend per shot

Cost per shot, attempts per keeper and first-try pass rate, so you know which models are worth it.

Pricing

Cancel any time.

Starter

US$9 / month
  • 300 checks every month
  • Verdicts, fixes and spend reports
  • Claude, Cursor, VS Code, Python SDK and AI agents
Get Starter US$99 / year

Pro For daily creators

US$29 / month
  • 3,000 checks every month, 10x Starter
  • Built for studios and batch rendering
  • Everything in Starter
Get Pro US$290 / year

Secure checkout, tax and invoices by Polar. Your license key arrives in the receipt and works right away.

Start saving in 3 steps

Get your key. Pick a plan above. The license key arrives in your receipt instantly.
Install in one click. Download for Claude Desktop
Double-click the file and paste your key. Using Cursor, VS Code, Claude Code, Python or an AI agent? Setup takes a minute.
Ask your assistant. "Check renders/shot10.mp4 before I pay for the next one." You get a verdict and the exact fixes.
Claude Code command
claude mcp add smart-token-guard -e STG_LICENSE_KEY=your-license-key -- \
  uvx --from git+https://github.com/nwjnjjj/smart-token-guard smart-token-guard

Questions

I generate on Kling, Runway or another web tool. Does it work?

Yes. Download the clip and point your assistant at the file, or pass the link to the agent endpoint. It works with any image or video you can export.

Do you keep my videos?

No. Each file is analysed and deleted right after the check. Your project spend ledger stays on your own computer.

What counts as a check?

One image or clip inspected. Verdicts, fixes and spend reports are included for free.

Can my team use it?

Each license is for one person. Teams get one per member, and Pro covers heavy daily use.