Compare two texts

$0.003 per call · failed calls are never charged · no account or API key needed

Line-by-line difference between two texts: each line marked as unchanged, removed or added, with counts. Use to see what changed between two versions of a document, config or prompt.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
a (required)stringThe original text
b (required)stringThe new text

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/text/diff?a=one%0Atwo%0Athree&b=one%0A2%0Athree%0Afour"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/text/diff?a=one%0Atwo%0Athree&b=one%0A2%0Athree%0Afour&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, Monad, World Chain or Tempo) and retries.

Example result

{
  "added": 2,
  "removed": 1,
  "unchanged": 2,
  "lines": [
    {
      "op": "=",
      "line": "one"
    },
    {
      "op": "-",
      "line": "two"
    },
    {
      "op": "+",
      "line": "2"
    }
  ]
}

From an AI agent (MCP)

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

https://agent-data-tools.revmesh2074.workers.dev/mcp

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