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Vextorium Text Diff API
x402
Vextorium Text Diff API is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).
Compares two text versions line-by-line or word-by-word, returning similarity percentage, added/removed counts, a list of changes with positions, and a unified diff.
Price / call$0.003
Success—
StatusUnknown
How this service works
Compare two texts by lines or words: similarity %, added and removed items, list of changes with positions, and a unified diff. For contract versions, prompts, configs or scraped pages.
Output
A JSON object containing: the comparison mode used (lines or words), whether the texts are identical, similarity percentage (parecido_pct), count of added and removed elements, total element counts for each text, a list of changes each with type (added/removed/changed), before/after values, and positions in both originals, plus a unified diff string.
Example use cases
Contract version change audit
“I have two versions of a vendor contract — compare them line by line and tell me exactly what changed, where each change is, and how similar the two versions are overall.”
Prompt template diff review
“Here are my original and updated AI prompt templates — do a word-by-word comparison and show me what was added, what was removed, and the unified diff so I can review the edits.”
Scraped page change detection
“I scraped this webpage yesterday and again today — compare the two versions line by line and tell me what's different, including a similarity percentage and a unified diff with 2 lines of context.”
Technical details
Endpoint
POSThttps://api.vextorium.com/diferencias-texto-pago?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a structured, machine-readable diff between two text versions — especially when you need both a human-readable unified diff AND programmatic change data (positions, counts, similarity score) in one call. Prefer it over generic diff tools when you need the similarity percentage and per-change position metadata, or when comparing contracts, prompts, configs, or scraped pages in an automated agent workflow.
Side effects
- Missing required fields (original or modificado) returns a validation error
- Very large texts may time out or hit payload limits
- Invalid mode enum value (not 'lineas' or 'palabras') causes schema rejection
- Non-string body values cause type errors
- contexto out of range 0-10 may cause unexpected behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| modo | string | |
| contexto | integer | Context lines in the unified diff (0-10) |
| original | string | |
| modificado | string |
Output
Schema · Response
{
"type": "json",
"example": {
"modo": "lineas",
"cambios": [
{
"tipo": "cambiado",
"antes": "Price: 10 EUR",
"despues": "Price: 12 EUR",
"posicion_nueva": 1,
"posicion_original": 1
},
{
"tipo": "cambiado",
"antes": "Warranty: 1 year",
"despues": "Warranty: 2 years",
"posicion_nueva": 3,
"posicion_original": 3
}
],
"anadidos": 2,
"quitados": 2,
"identicos": false,
"parecido_pct": 33.33,
"diff_unificado": "--- original\n+++ modificado\n@@ -1,3 +1,3 @@\n-Price: 10 EUR\n+Price: 12 EUR\n Delivery: 3 days\n-Warranty: 1 year\n+Warranty: 2 years",
"elementos_original": 3,
"elementos_modificado": 3
}
}Tags
x402
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