APIs that charge only when they help.

Compress PDFs, optimize images, build spreadsheets and merge PDFs from prepaid credit. A call that fails, or does not make your file smaller, costs nothing.

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4 APIs, 3 live and 1 in beta. Each one has a free tool on its own page.

JustAPI POST /v1/pdf/compress
Document
59-page client report
Input
27.2 MB
Output
5.1 MB
Smaller by
81%
Time
about 11 s
Charged
$0.04

A real run against the live API, not a projection.

Before
27.2 MB
After
5.1 MB
Drawn to scale. The same 59 pages, 81% smaller, for $0.04.

A catalog of file APIs, one contract.

Every API takes your file, returns its own result and states its own bill. Try each one free, five times a day.

Every API, endpoint and limit

One call in. A file and its bill back.

No SDK. Send a URL; long jobs report to your webhook. The result carries its own arithmetic, so you can check the charge against the work.

Request
curl https://api.justapi.tech/v1/pdf/compress \
  -H "Authorization: Bearer JUSTAPI_KEY" \
  -H "Idempotency-Key: report-2291" \
  -H "Content-Type: application/json" \
  -d '{
    "source": { "url": "https://example.com/report.pdf" },
    "options": { "profile": "auto" },
    "webhook": { "url": "https://example.com/hooks/pdf-done" }
  }'

An Idempotency-Key means a retried workflow never pays twice for the same job.

Result
{
  "status": "completed",
  "stats": {
    "original_bytes": 27200000,
    "output_bytes": 5100000,
    "ratio": 0.81,
    "pages": 59
  },
  "billing": {
    "charged_micros": 40000
  }
}

Trimmed to the fields that matter, from the measured 59-page run. charged_micros counts millionths of a dollar: 40,000 is $0.04.

When the bill reads $0.00.

A charge has to be explainable. If the work did not happen, or did not help, there is nothing to explain.

  • The PDF could not be made smaller. You get your original file back.

    $0.00

  • The optimized image came out no smaller than the source. It is still returned.

    $0.00

  • An image in a batch failed. You pay for the ones that succeeded.

    $0.00

  • Your request was invalid. Any 4xx.

    $0.00

  • Something broke on our side. Any 5xx.

    $0.00

The more you send, the less each one costs.

Graduated tiers per operation, counted per calendar month. Move the sliders to see your bill tier by tier.

OperationTier 1Month
PDF compression, up to 25 MB$0.00$0.00
PDF compression, 25 to 200 MB$0.00$0.00
Image optimization$0.00$0.00
JSON to Excel, file and cells$0.00$0.00

Total per month$0.00

Each tier is charged at its own price, in calendar months (UTC). Calls that fail or do not help are not counted.

The full price table and the rules

No AI in the workers
Compression is resampling and encoding. The same file and options give the same output, at a cost that does not move.
Files do not linger
Inputs and results are deleted within 24 hours, or at once when you acknowledge the download.
Prepaid, to the micro-dollar
Credit is counted in millionths of a dollar, so a $0.0012 image is charged as exactly that.
Made for no-code tools
Send a file by URL, let long jobs finish in the background, and take the result on a webhook your workflow already understands.

Start with 1 USD. No card.

Create an account and get $1.00 of credit. Deposits start at $5.00. Or try any API free first, with no account at all.

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