agent402.tools Text Diff (LCS)

x402

agent402.tools Text Diff (LCS) is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Computes a line-by-line diff of two texts using LCS and returns unified-style diff operations with change counts.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Line-by-line diff of two texts (LCS). Returns unified-style ops and change counts. Up to 2000 lines per side.

Output

A unified-style list of diff operations (add, remove, equal) for each line, along with counts of how many lines were added, removed, and unchanged between the two input texts.

Example use cases

Example prompt

“Show me the line-by-line diff between these two versions of my config file — the original starts with 'timeout=30\nretries=3\n...' and the new version starts with 'timeout=60\nretries=5\n...' — I want to see exactly which lines were added, removed, or unchanged.”

Technical details

Endpoint

POSThttps://agent402.tools/api/text-diff

When to prefer

Use this endpoint when you need a programmatic, line-level diff between two text blocks (up to 2000 lines each) and want structured output — unified-style ops and change counts — rather than a human-readable summary. Prefer this over LLM-based comparison when you need deterministic, exact diff results suitable for downstream processing or automation.

Side effects

Input text exceeds 2000 lines per side — the endpoint enforces a line limit and will reject oversized inputs
Missing 'a' or 'b' fields in the request body — returns a validation error
Payment not included or insufficient — returns a 402 Payment Required response
Network timeout if texts are very long near the limit

Input

Schema · Request body

Field	Type	Description
a	string	Original text
b	string	New text

Output

Schema · Response

{
  "type": "json",
  "example": {
    "diff": [
      {
        "op": " ",
        "line": "line1"
      },
      {
        "op": "-",
        "line": "line2"
      },
      {
        "op": "+",
        "line": "line2 changed"
      }
    ],
    "added": 1,
    "removed": 1,
    "unchanged": 1
  }
}

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Technical details

Endpoint

POSThttps://agent402.tools/api/text-diff

When to prefer

Side effects

Input text exceeds 2000 lines per side — the endpoint enforces a line limit and will reject oversized inputs
Missing 'a' or 'b' fields in the request body — returns a validation error
Payment not included or insufficient — returns a 402 Payment Required response
Network timeout if texts are very long near the limit

Input

Schema · Request body

Field	Type	Description
a	string	Original text
b	string	New text

Output

Schema · Response

{
  "type": "json",
  "example": {
    "diff": [
      {
        "op": " ",
        "line": "line1"
      },
      {
        "op": "-",
        "line": "line2"
      },
      {
        "op": "+",
        "line": "line2 changed"
      }
    ],
    "added": 1,
    "removed": 1,
    "unchanged": 1
  }
}