Text diff comparison API for AI agents. Compare two texts line-by-line: additions, deletions, unchanged lines, and summary statistics (added/removed/changed counts). Tools: text_compare_diff. Use this for code review, document versioning, change tracking, or content comparison. Returns structured diff ready for rendering. Returns: {diff[], added, removed, changed}. No API key required — x402 micropayment $0.002/call on Base L2.
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