Phone GTIN ISBN Validator API docs

POSThttps://www.brainiac.software/api/v1/identifiers/phone-e164-validate$0.02 USDC

Validate a phone number to E.164

Normalise and validate a phone number with bundled libphonenumber metadata. Returns validity, E.164, region, calling code, and number type when known. Not a live carrier lookup.

Body

Field	Required	Notes
`phone`	Yes	string
`defaultRegion`	No	string

Request exampleJSON

{
  "phone": "+1 650-253-0000",
  "defaultRegion": "US"
}

Response exampleJSON

{
  "retrievedAt": "2026-11-14T20:00:00.000Z",
  "input": "+1 650-253-0000",
  "defaultRegion": "US",
  "valid": true,
  "possible": true,
  "e164": "+16502530000",
  "region": "US",
  "countryCallingCode": "1",
  "nationalNumber": "6502530000",
  "type": "fixed_line_or_mobile",
  "sources": [
    {
      "source": "libphonenumber-js metadata (ITU/E.164)",
      "url": "https://github.com/catamphetamine/libphonenumber-js",
      "retrievedAt": "2026-11-14T20:00:00.000Z",
      "status": "ok"
    }
  ],
  "limitations": [
    "This validates structure against bundled libphonenumber metadata. It is not a live carrier lookup."
  ]
}

cURL

curl -i -X POST "https://www.brainiac.software/api/v1/identifiers/phone-e164-validate" \
  -H 'content-type: application/json' \
  -H 'Idempotency-Key: <fresh-64-character-random-hex-key>' \
  --data-binary @- <<'JSON'
{
  "phone": "+1 650-253-0000",
  "defaultRegion": "US"
}
JSON

POSThttps://www.brainiac.software/api/v1/identifiers/gtin-checksum-validate$0.01 USDC

Validate a GTIN check digit

Validate GTIN-8, GTIN-12, GTIN-13, or GTIN-14 check digits with the published GS1 algorithm. Company prefix ownership is not looked up.

Body

Field	Required	Notes
`gtin`	Yes	string

Request exampleJSON

{
  "gtin": "5901234123457"
}

Response exampleJSON

{
  "retrievedAt": "2026-11-14T20:00:00.000Z",
  "gtin": "5901234123457",
  "length": 13,
  "lengthOk": true,
  "formatOk": true,
  "expectedCheckDigit": 7,
  "observedCheckDigit": 7,
  "checksumOk": true,
  "valid": true,
  "sources": [
    {
      "source": "GS1 check digit algorithm",
      "url": "https://www.gs1.org/services/check-digit-calculator",
      "retrievedAt": "2026-11-14T20:00:00.000Z",
      "status": "ok"
    }
  ],
  "limitations": [
    "Only GTIN-8/12/13/14 check digits are validated."
  ]
}

cURL

curl -i -X POST "https://www.brainiac.software/api/v1/identifiers/gtin-checksum-validate" \
  -H 'content-type: application/json' \
  -H 'Idempotency-Key: <fresh-64-character-random-hex-key>' \
  --data-binary @- <<'JSON'
{
  "gtin": "5901234123457"
}
JSON

POSThttps://www.brainiac.software/api/v1/identifiers/isbn-issn-validate$0.01 USDC

Validate ISBN or ISSN check digits

Validate ISBN-10, ISBN-13, or ISSN check characters after stripping spaces and hyphens. Bibliographic metadata is not looked up.

Body

Field	Required	Notes
`value`	Yes	string
`kind`	No	string; One of: auto, isbn, issn; Default: "auto"

Request exampleJSON

{
  "value": "978-0-306-40615-7",
  "kind": "isbn"
}

Response exampleJSON

{
  "retrievedAt": "2026-11-14T20:00:00.000Z",
  "kind": "isbn-13",
  "value": "9780306406157",
  "formatOk": true,
  "expectedCheckDigit": 7,
  "observedCheckDigit": 7,
  "checksumOk": true,
  "valid": true,
  "isbn13Equivalent": "9780306406157",
  "sources": [
    {
      "source": "ISBN-10 / ISBN-13 check digit rules",
      "url": "https://www.isbn-international.org/",
      "retrievedAt": "2026-11-14T20:00:00.000Z",
      "status": "ok"
    }
  ],
  "limitations": [
    "Title or publisher metadata is not looked up."
  ]
}

cURL

curl -i -X POST "https://www.brainiac.software/api/v1/identifiers/isbn-issn-validate" \
  -H 'content-type: application/json' \
  -H 'Idempotency-Key: <fresh-64-character-random-hex-key>' \
  --data-binary @- <<'JSON'
{
  "value": "978-0-306-40615-7",
  "kind": "isbn"
}
JSON

POSThttps://www.brainiac.software/api/v1/identifiers/eori-format-validate$0.01 USDC

Validate EORI number format

Validate Economic Operators Registration and Identification (EORI) shape: ISO country prefix plus up to 15 alphanumeric characters. Does not confirm the number is issued.

Body

Field	Required	Notes
`eori`	Yes	string

Request exampleJSON

{
  "eori": "GB123456789000"
}

Response exampleJSON

{
  "retrievedAt": "2026-11-14T20:00:00.000Z",
  "eori": "GB123456789000",
  "country": "GB",
  "length": 14,
  "formatOk": true,
  "valid": true,
  "sources": [
    {
      "source": "EU EORI structure (country code + national identifier)",
      "url": "https://taxation-customs.ec.europa.eu/",
      "retrievedAt": "2026-11-14T20:00:00.000Z",
      "status": "ok"
    }
  ],
  "limitations": [
    "This checks EORI shape only. It does not confirm the number is issued."
  ]
}

cURL

curl -i -X POST "https://www.brainiac.software/api/v1/identifiers/eori-format-validate" \
  -H 'content-type: application/json' \
  -H 'Idempotency-Key: <fresh-64-character-random-hex-key>' \
  --data-binary @- <<'JSON'
{
  "eori": "GB123456789000"
}
JSON