ULID Generator API

GET

Give every record a unique ID that naturally sorts by time.

ULID Generator creates Universally Unique Lexicographically Sortable Identifiers that order records chronologically. Pass an optional batch count and millisecond timestamp to produce 26-character collision-resistant unique IDs with format details.

Try it — live request, no key required

Request

GETapi.apiverve.com/v1/ulidgenerator

Verification

Format

No key required to try it. Get a key to use it in your app.

Example

{
  "status": "ok",
  "error": null,
  "data": {
    "ulids": [
      "01KCMMK564DMMCC17AVBZTVNT1",
      "01KCMMK565ZE4681DFAEWBF95G",
      "01KCMMK566K1REYH0JEK4Q8DKW",
      "01KCMMK5670W9EHFNX76R8FKWH",
      "01KCMMK568SFRY6DCZTZYMR66Y"
    ],
    "count": 5,
    "timestamp": 1765924246724,
    "format": "26 characters (10 timestamp + 16 random)",
    "sortable": true,
    "case_insensitive": true
  }
}

About the ULID Generator API

ULID Generator works by combining a timestamp component (10 characters) with random data (16 characters) using Crockford's Base32 alphabet. Results are case-insensitive, sortable, and URL-safe.

What people use it for

Database Keys: Generate sortable primary keys for databases that maintain chronological order
Distributed Systems: Create unique identifiers across distributed systems with time-based sorting
Log Aggregation: Generate sortable IDs for log entries and event tracking systems
API Resources: Create resource identifiers that reveal creation time and sort naturally

Ways to call it

One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.

JSON: Default REST response
XML: Markup format
YAML: Human-readable
CSV: Tabular export
GraphQL: Query language
MCP: For AI agents

View all integrations →

Other ways to use ULID Generator

Same data, same APIVerve account, same credit balance — one key works on all of them.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.on VerveKit Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.on VerveSheets

Questions.

Common questions about the ULID Generator API.

Read the docs →

How many generation requests does the Free plan cover?

The Free plan covers 100 requests per month. Each request uses 2 credits. If you need higher volume, the Starter plan handles up to 100,000 requests per month, which works out to about $0.30 per 1,000 calls.

Do I get the timestamp value back on the Free plan?

No, the millisecond timestamp field used during generation is a premium field. It requires any paid plan, starting with the Starter plan.

Can I generate identifiers for a specific point in time?

Yes. You can supply an optional custom timestamp in milliseconds to backdate or anchor identifiers to an exact moment. If omitted, the API uses the current system time.

Can I create multiple identifiers in a single call?

Yes. Pass the count parameter in your request to generate a batch of ULIDs at once. The response returns the identifiers together in an array.

Are the generated identifiers safe to use in URLs and databases?

Yes. Each ULID is a 26-character string combining a 10-character timestamp with 16 characters of random data encoded in Crockford's Base32 alphabet. They are URL-safe, case-insensitive, and lexicographically sortable.

Request parameters — GET /v1/ulidgenerator

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.

Optional

Parameter	Type	Example	Description
`count`Optional	integer	`5`	Number of ULIDs to generate default 1 · range 1-100
`timestamp`Optional	integer	`1609459200000`	Custom timestamp in milliseconds (optional, uses current time if not specified)

Example request

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curl "https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000" \
  -H "x-api-key: YOUR_API_KEY"

Authentication

Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.

Header	When	Value
`x-api-key`Required	Every request	Your API key. Header names are case-insensitive, so `X-API-Key` is the same header.
`Authorization`Alternate	Instead of the above	`Bearer <key>` — for clients that only expose bearer auth. Resolves to the same account and the same billing.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Response — GET /v1/ulidgenerator

Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "ulids": [
      "01KCMMK564DMMCC17AVBZTVNT1",
      "01KCMMK565ZE4681DFAEWBF95G",
      "01KCMMK566K1REYH0JEK4Q8DKW",
      "01KCMMK5670W9EHFNX76R8FKWH",
      "01KCMMK568SFRY6DCZTZYMR66Y"
    ],
    "count": 5,
    "timestamp": 1765924246724,
    "format": "26 characters (10 timestamp + 16 random)",
    "sortable": true,
    "case_insensitive": true
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`ulids`	array	`[01KCMMK564DMMCC17AVBZTVNT1, ...]`	Array of generated ULID strings in proper format
`count`	number	`5`	Number of ULIDs generated in this request
`timestamp`Premium	number	`1765924246724`	Timestamp in milliseconds used for generation
`format`	string	`"26 characters (10 timestamp + 16 random)"`	ULID format specification and component breakdown details
`sortable`	boolean	`true`	Whether generated ULIDs maintain natural chronological sorting
`case_insensitive`	boolean	`true`	Whether ULIDs are case-insensitive for comparison purposes

Response headers

Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.

Header	What it carries
`x-api-remaining-credits`	Credits left in the current cycle
`x-api-credits-used`	Credits spent in the current cycle
`x-api-max-credits`	The allowance for the cycle
`x-api-version`	Version of the endpoint that answered

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter that has to change.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted here	A key restriction or an IP allow-list — never a bad key.
`429`	Rate limited, or out of credits	Read `error` to tell them apart, then back off or top up.

What a call costs — 2 credits per call

Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.

Plan	Per month	Credits	ULID Generator calls	Per 1,000 calls
Free	Free	200	100	Free
Starter	$29.99	200,000	100,000	$0.30
Pro	$99.99	1,000,000	500,000	$0.20
Mega	$299.99	4,000,000	2,000,000	$0.15

Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.

Compare all pricing tiers →

Call it from cURL — GET /v1/ulidgenerator

No SDK to install — this is a plain HTTPS call to /v1/ulidgenerator with your key in the x-api-key header. Swap in a real key and it runs as-is.

cURL

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2

curl "https://api.apiverve.com/v1/ulidgenerator" \
  -H "x-api-key: YOUR_API_KEY"

Resources

GitHubapiverve/ulidgenerator-apiSource, issues and the examples this page is built from.ReferenceULID Generator API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/ulidgeneratornpm APIVerve.API.ULIDGeneratorNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Node.js — GET /v1/ulidgenerator

Install the Node.js SDK, then call the ULID Generator API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — npm

npm install @apiverve/ulidgenerator

Node.js

const res = await fetch("https://api.apiverve.com/v1/ulidgenerator", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Resources

npm@apiverve/ulidgeneratorThe published Node.js client, versioned and signed.GitHubapiverve/ulidgenerator-apiSource, issues and the examples this page is built from.ReferenceULID Generator API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

APIVerve.API.ULIDGeneratorNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Python — GET /v1/ulidgenerator

No SDK to install — this is a plain HTTPS call to /v1/ulidgenerator with your key in the x-api-key header. Swap in a real key and it runs as-is.

Python

import requests

res = requests.get(
    "https://api.apiverve.com/v1/ulidgenerator",
    headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])

Resources

Also published for

@apiverve/ulidgeneratornpm APIVerve.API.ULIDGeneratorNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from C# / .NET — GET /v1/ulidgenerator

Install the C# / .NET SDK, then call the ULID Generator API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — NuGet

dotnet add package APIVerve.API.ULIDGenerator

C# / .NET

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

var json = await client.GetStringAsync("https://api.apiverve.com/v1/ulidgenerator");
Console.WriteLine(json);

Resources

NuGetAPIVerve.API.ULIDGeneratorThe published C# / .NET client, versioned and signed.GitHubapiverve/ulidgenerator-apiSource, issues and the examples this page is built from.ReferenceULID Generator API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/ulidgeneratornpm

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Go — GET /v1/ulidgenerator

No SDK to install — this is a plain HTTPS call to /v1/ulidgenerator with your key in the x-api-key header. Swap in a real key and it runs as-is.

req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/ulidgenerator", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")

res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Resources

Also published for

@apiverve/ulidgeneratornpm APIVerve.API.ULIDGeneratorNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from PHP — GET /v1/ulidgenerator

No SDK to install — this is a plain HTTPS call to /v1/ulidgenerator with your key in the x-api-key header. Swap in a real key and it runs as-is.

PHP

$ch = curl_init("https://api.apiverve.com/v1/ulidgenerator");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);

$response = curl_exec($ch);
echo $response;

Resources

Also published for

@apiverve/ulidgeneratornpm APIVerve.API.ULIDGeneratorNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Ruby — GET /v1/ulidgenerator

No SDK to install — this is a plain HTTPS call to /v1/ulidgenerator with your key in the x-api-key header. Swap in a real key and it runs as-is.

Ruby

require "net/http"

uri = URI("https://api.apiverve.com/v1/ulidgenerator")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.body

Resources

Also published for

@apiverve/ulidgeneratornpm APIVerve.API.ULIDGeneratorNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

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ULID Generator API

Try it — live request, no key required

About the ULID Generator API

What people use it for

Ways to call it

Other ways to use ULID Generator

Questions.

Request parameters — GET /v1/ulidgenerator

Optional

Authentication

Response — GET /v1/ulidgenerator

Response fields

Response headers

Errors

What a call costs — 2 credits per call

Call it from cURL — GET /v1/ulidgenerator

Resources

Also published for

Call it from Node.js — GET /v1/ulidgenerator

Resources

Also published for

Call it from Python — GET /v1/ulidgenerator

Resources

Also published for

Call it from C# / .NET — GET /v1/ulidgenerator

Resources

Also published for

Call it from Go — GET /v1/ulidgenerator

Resources

Also published for

Call it from PHP — GET /v1/ulidgenerator

Resources

Also published for

Call it from Ruby — GET /v1/ulidgenerator

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — ULID Generator API

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