Semver compare API: which version is newer and the next bump

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Semver compare of two semantic versions (1.2.3, pre-releases like 2.0.0-rc.1 handled by the SemVer rules): which is newer, plus the next major, minor and patch versions of the first. Use to decide whether an upgrade is a major change.

When to use it

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

First version
Second version

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
a (required)stringFirst version
b (required)stringSecond version

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/semver?a=1.10.0&b=1.9.3"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/semver?a=1.10.0&b=1.9.3&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "a": "1.10.0",
  "b": "1.9.3",
  "comparison": 1,
  "newer": "1.10.0",
  "nextMajor": "2.0.0",
  "nextMinor": "1.11.0",
  "nextPatch": "1.10.1"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is semver, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

What does it take?

Two semantic versions such as 1.10.0 and 1.9.3; pre-releases follow the SemVer rules.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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