{
  "markdown": "# Diff Checker API\n\n[![MCP Server](https://img.shields.io/badge/MCP-server-blue)](https://diff-checker.api.klymax402.com/mcp)\n[![x402](https://img.shields.io/badge/payments-x402-6E56CF)](https://x402.org)\n[![License: MIT](https://img.shields.io/badge/license-MIT-green)](LICENSE)\n\nCompare two texts line-by-line. Returns structured diff with additions, deletions, unchanged lines, and summary stats. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.\n\nPart of the [klymax402](https://klymax402.com) marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.\n\n## Quickstart -- MCP\n\nAdd to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):\n\n```json\n{\n  \"mcpServers\": {\n    \"diff-checker\": {\n      \"url\": \"https://diff-checker.api.klymax402.com/mcp\"\n    }\n  }\n}\n```\n\n## Quickstart -- HTTP (x402)\n\n```bash\ncurl -X POST \"https://diff-checker.api.klymax402.com/api/diff\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"text1\":\"...\",\"text2\":\"...\"}'\n# -> 402 Payment Required, with an x402 payment challenge in the response body\n```\n\nAny x402-aware client ([`@x402/fetch`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/x402-agent-tools), ATXP) handles the 402 -> sign -> retry cycle automatically.\n\n## Tools\n\n| Tool | Method | Path | Price | Description |\n|---|---|---|---|---|\n| `text_compare_diff` | POST | `/api/diff` | $0.005 | Compare two texts and show line-by-line differences |\n\n### `text_compare_diff`\n\nUse 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.\n\n**Parameters**\n\n| Name | Type | Required | Description |\n|---|---|---|---|\n| `text1` | string | yes | The original text (base) |\n| `text2` | string | yes | The modified text to compare against |\n\nExample response:\n\n```json\n{\"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}\n```\n\n**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.\n\n**Not for**: text classification (use `text_classify_content`), sentiment analysis (use `text_analyze_sentiment`), word counting (use `text_count_words`).\n\n## Example agent prompts\n\n- \"Compare two pieces of text and identify exactly what changed between them\"\n\n## Payment\n\n- Protocol: [x402](https://x402.org) -- HTTP-native pay-per-call, no signup, no API key\n- Network: Base L2 (`eip155:8453`)\n- Asset: USDC\n- Facilitator: Coinbase CDP (primary), PayAI (fallback)\n- Also reachable via [ATXP](https://atxp.ai) (OAuth-wrapped x402, RFC 9728 protected-resource metadata)\n\n## Part of klymax402\n\n100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.\n\n- Catalog: https://klymax402.com/llms.txt\n- Full API reference: https://klymax402.com/llms-full.txt\n- Live stats: https://klymax402.com/stats\n\n## License\n\nMIT\n",
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  "sha": "cddf3a83bdfbc4de7107ef6ff67999a17435d4f248ab73aac0279a1da7fb2cc1",
  "repo_slug": "br0ski777/diff-checker-x402",
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  "api": "https://agentalog.com/api/listings/mcp_io_github_br0ski777_diff_checker_181aaeda/readme"
}