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402utils Text Diff
x402
402utils Text Diff is a paid API for AI agents from 402utils.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Computes a unified diff between two texts, returning a standard patch, added/removed line counts, and optionally word-level token changes for inline highlighting.
Price / call$0.002
Success—
StatusUnknown
How this service works
Compute the diff between two texts (a → b) — no git needed. Returns a standard unified patch (line-oriented in both modes, applies with git apply or patch), added/removed counts, and in word mode a token-level change list for inline highlighting (capped at 2000 entries). CRLF line endings and missing trailing newlines are preserved byte-exactly. Caps: 1 MB UTF-8 per input; pathologically divergent inputs return 422 diff_too_complex.
Output
Returns a standard unified patch (line-oriented, applicable with git apply or patch), counts of added and removed lines, and in word mode a token-level change list (capped at 2000 entries) for inline highlighting. CRLF and missing trailing newlines are preserved byte-exactly. Returns 422 if inputs are pathologically divergent.
Example use cases
Example prompt
“Show me the word-level diff between these two paragraphs — the original starts with 'The quick brown fox' and the revised version starts with 'A swift brown fox jumped' — use word mode with 2 context lines so I can highlight exactly what changed inline.”
Technical details
Endpoint
POSThttps://402utils.com/v1/diffWhen to prefer
Use this endpoint when you need a standard unified diff between two text strings without setting up git or any local tooling, especially when you also want word-level token changes for inline UI highlighting. Ideal for agents that need to compare document revisions, code snippets, or any UTF-8 text programmatically and get a patch that can be directly applied with standard tools.
Side effects
- 422 diff_too_complex — inputs are pathologically divergent and exceed complexity limits
- 413 or validation error — either input text exceeds 1 MB UTF-8 limit
- Invalid mode value — only 'line' or 'word' accepted
- Context value out of range — must be integer 0–10
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| a | string | Original text. Max 1 MB UTF-8. |
| b | string | New text. Max 1 MB UTF-8. |
| mode | string | Granularity of stats/changes. The patch is always a line-oriented unified diff. Default "line". |
| context | integer | Unchanged context lines around each patch hunk. Default 3. |
Output
Schema · Response
{
"type": "json",
"example": {
"mode": "line",
"patch": "===================================================================\n--- a\n+++ b\n@@ -1,2 +1,2 @@\n name: farm\n-price: 1 USDC\n+price: 2 USDC\n",
"stats": {
"added": 1,
"removed": 1
},
"identical": false
}
}Tags
x402
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