Diff Checker X402

What is Diff Checker X402?

Diff Checker X402 is an MCP server that compares two texts line-by-line and returns a structured diff with additions, deletions, unchanged lines, and summary statistics. It is a pay-per-call API using the x402 protocol (USDC on Base L2) with no API key, no signup, and no rate limit walls. It is part of the klymax402 marketplace of 100 x402 micropayment APIs for AI agents.

How to use Diff Checker X402?

Add the server to your MCP client configuration (e.g., Claude Desktop, Cursor, ElizaOS) using the URL https://diff-checker.api.klymax402.com/mcp. For direct HTTP calls, use curl with a POST to /api/diff and include the two texts; a 402 payment challenge will be returned, which any x402-aware client (like @x402/fetch or x402-agent-tools) handles automatically.

Key features of Diff Checker X402

• Line-by-line text comparison with structured output
• Pay-per-call micropayments via x402 (USDC on Base)
• No API key, signup, or rate limits required
• Single tool: text_compare_diff at $0.002 per call
• Returns summary stats (lines added, removed, unchanged, similarity %)
• Part of the klymax402 ecosystem of 100 x402 APIs

Use cases of Diff Checker X402

• Code review: compare before/after versions of code
• Document revision tracking: identify changes between drafts
• Configuration file auditing: verify differences before deployment
• Template modification checking: compare template variants
• Automated diff tasks in AI agent workflows

FAQ from Diff Checker X402

How does payment work with Diff Checker X402?

The server uses the x402 protocol, which is an HTTP-native pay-per-call system. The first call returns a 402 Payment Required response with a payment challenge. An x402-aware client automatically signs the payment (USDC on Base L2) and retries the request. No API key or signup is needed.

What parameters does the text_compare_diff tool require?

It requires two string parameters: text1 (the original text) and text2 (the modified text). Both are required.

What is x402 and which network does it use?

x402 is a protocol for HTTP-native pay-per-call micropayments. Diff Checker X402 uses the Base L2 network (eip155:8453) and USDC as the asset. Coinbase CDP is the primary facilitator, with PayAI as a fallback.

Are there any rate limits or usage caps?

The README explicitly states there is "no rate-limit wall". The only cost is per-call micropayments.

What should I not use Diff Checker X402 for?

It is not for text classification, sentiment analysis, or word counting. Other tools in the klymax402 marketplace cover those tasks.