APIs › Image, SVG, QR & Barcode › Barcode Generator

Barcode Generator

Generates EAN-13, EAN-8, UPC-A, Code128, Code39, ISBN or ITF barcodes with checksum computation and validation.

POST /v1/barcode/create $0.005 per call

Specification

Endpoint

POST /v1/barcode/create

Price

$0.005 per call · tier basic_data

Payment

x402 on X Layer (chain 196) · settled in USDG or USDT0 · schemes exact, aggr_deferred

Data source

Local sandboxed processing of the uploaded image

Timeout

60 seconds

Max request

20 MB

Version

1.0.0

Calling it

The first call returns a 402 with the payment challenge. Retry with a signed authorisation in the X-PAYMENT header — see the payment guide for the exact shape.

curl -i -X POST "https://api.dana-edu.pp.ua/v1/barcode/create" \
  -H "content-type: application/json" \
  -d '{ ... }'

Response

Real output, captured by running this endpoint at build time — not written by hand. Volatile fields such as timestamps are elided. Captured 2026-07-30.

{
  "symbology": "ean13",
  "input": "5901234123457",
  "encoded_value": "5901234123457",
  "check_digit_added": false,
  "output_format": "PNG",
  "output_size_bytes": 5392,
  "output_base64": "<base64 payload elided from the published example>",
  "note": "EAN, UPC and ISBN carry a check digit. If it was omitted it has been computed and appended; 'encoded_value' is what the barcode actually contains."
}

Every response is wrapped in the same envelope: data plus warnings, sources, confidence, informational_only and a measured processing_ms. See the envelope reference.

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