Sedol validate

sedol-validate · version 1.0.0 · Identifiers & check digits · free, no key needed

Validate a 7-character SEDOL's weighted modulus 10 check digit and report whether it is a legacy all-numeric code.

Use when you need to: validate a sedol · check sedol check digit · is this sedol code valid.

Decide before calling

Read the versioned contract and the supported scope below. Reuse sedol-validate@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use sedol-validate@1.0.0 for validate a sedol. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

• validate a sedol
• check sedol check digit
• is this sedol code valid
• sedol checksum validator
• uk security identifier check digit
• verify stock exchange daily official list number
• is this a legacy all numeric sedol

Not supported

• looking up which company or security a SEDOL actually identifies
• validating a 12-character ISIN that embeds a SEDOL (see isin-validate)
• accepting vowels A, E, I, O or U anywhere in the payload

Behavior

• sedol must be exactly 7 characters: no case folding, no trimming. Any other length is reason wrong_length, checked first.
• check_digit (character 7) and legacy_numeric (true when all 7 characters are digits) are populated whenever sedol is exactly 7 characters, regardless of charset or check-digit validity; both are null only when length already failed.
• Characters 1-6 must each be a digit or an uppercase letter B-Z (never a vowel); character 7 must be a digit, else reason invalid_character.
• Check digit: a digit's value is itself; a letter's value is 9 plus its 1-based alphabet position (B=11 ... Z=35). Multiply characters 1-6 by weights 1,3,1,7,3,9 respectively and sum; expected check digit is (10 - sum mod 10) mod 10. A mismatch is reason check_digit_mismatch.
• valid is true only when length, charset and the check digit all pass, in that order; only one reason is ever returned.

Input

• sedol (string, required): min length 1; max length 7

Output

• valid (boolean, required)
• reason (one of null, "wrong_length", "invalid_character", "check_digit_mismatch", required)
• check_digit (string or null, required): min length 1; max length 1
• legacy_numeric (boolean or null, required)

Limits

• max sedol bytes: 7

Example

Request input:

{
  "sedol": "0263494"
}

Response:

{
  "result": {
    "valid": true,
    "reason": null,
    "check_digit": "4",
    "legacy_numeric": true
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "sedol-validate",
  "version": "1.0.0",
  "input": {
    "sedol": "0263494"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/sedol-validate/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"sedol":"0263494"}'

The machine-readable contract is at /v1/tools/sedol-validate/versions/1.0.0.

CLI

node cli.mjs run sedol-validate 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• Isin validate: Validate a 12-character ISIN's ISO 6166 Luhn check digit and parse its country prefix, NSIN and NSIN scheme.
• Cusip validate: Validate a 9-character CUSIP's Modulus 10 Double Add Double check digit and parse its issuer, issue and PPN marker.
• Ismn validate: Validate an ISMN's EAN mod 10 check digit in M-form or 979-0 form and return the canonical 13-digit form.
• Iso6346 container validate: Validate an 11-character ISO 6346 container number's mod-11 check digit and split the owner code, category and serial.
• Cas number validate: Validate a CAS Registry Number's position-weighted mod 10 check digit over its variable-length first segment.
• Checkdigit validate: Validate a full value's trailing check digit(s) against a named algorithm (Luhn, Verhoeff, Damm, ISO 7064, GS1, mod 10).