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Diff Checker API

Official registry Other

Compare two texts line-by-line — additions, deletions, unchanged. x402 micropayment.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (sse)
Claude Code 
claude mcp add --transport sse diff-checker-api 'https://diff-checker.api.klymax402.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "diff-checker-api": {
            "type": "sse",
            "url": "https://diff-checker.api.klymax402.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Diff Checker API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

Diff Checker API

Compare two texts line-by-line. Returns structured diff with additions, deletions, unchanged lines, and summary stats. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "diff-checker": {
      "url": "https://diff-checker.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://diff-checker.api.klymax402.com/api/diff" \
  -H "Content-Type: application/json" \
  -d '{"text1":"...","text2":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
text_compare_diffPOST/api/diff$0.005Compare two texts and show line-by-line differences
text_compare_diff

Use this when you need to compare two pieces of text and identify exactly what changed between them. Returns a structured line-by-line diff with summary statistics.

Parameters

NameTypeRequiredDescription
text1stringyesThe original text (base)
text2stringyesThe modified text to compare against

Example response:

{"changes":[{"type":"unchanged","content":"line 1"},{"type":"removed","content":"old line 2"},{"type":"added","content":"new line 2"}],"linesAdded":1,"linesRemoved":1,"linesUnchanged":1,"similarity":66.7}

When to use: code review (comparing before/after), tracking document revisions, verifying config file changes, or auditing template modifications. Use this BEFORE deploying config changes to understand what differs.

Not for: text classification (use text_classify_content), sentiment analysis (use text_analyze_sentiment), word counting (use text_count_words).

Example agent prompts

  • "Compare two pieces of text and identify exactly what changed between them"

Payment

  • Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
  • Network: Base L2 (eip155:8453)
  • Asset: USDC
  • Facilitator: Coinbase CDP (primary), PayAI (fallback)
  • Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Frequently asked questions

What is Diff Checker API?

Compare two texts line-by-line — additions, deletions, unchanged. x402 micropayment.

How do I install Diff Checker API?

It runs as a remote server. In Claude Code: claude mcp add --transport sse diff-checker-api 'https://diff-checker.api.klymax402.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Diff Checker API need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Diff Checker API open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Diff Checker API?

It is published by Br0ski777. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.