Silvertext API documentation

Check a document for plagiarism, grammar, citations and AI content from one API call. Get a key, submit text or a file, read back one report with fixes.

The Silvertext Writing Check API runs the same checks as the Silvertext app: word-level plagiarism matches with their sources, grammar and spelling findings, citation checks in APA, MLA or Chicago, a calibrated AI-content likelihood, and a clarity pass. One request submits a document; one report comes back, and every finding carries a fix you can apply.

Getting started

Create a key, send your first document, read the response. About ten minutes.

Guides

Polling, report shaping, files, idempotent retries, rate limits, reading a report.

How-to

Node.js, Python, Go and PHP clients, batch runs, and giving an AI agent the API.

API reference

Every endpoint, field and response, generated from the live spec, with a playground.

The shortest possible integration

Terminal

# 1. Submit a document (answers in well under a second with the check id)
curl -X POST https://api.silvertext.com/v1/checks \
  -H "Authorization: Bearer $SILVERTEXT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "title": "Draft", "text": "Paste the document here." }'

# 2. Poll until status is done, then read the scores
curl "https://api.silvertext.com/v1/checks/{id}?view=summary" \
  -H "Authorization: Bearer $SILVERTEXT_API_KEY"

Checks are asynchronous. Most finish in about a minute; a long document takes longer. The Overview explains the flow, and the quickstart has the same call in Node.js and Python.

What comes back

A report with five scores (plagiarism, grammarSpelling, citation, aiContent, clarity), an issues list where each finding has a category, a severity, the original span and a fix, the matched sources with URLs and metadata, and the spans that map every word of the document to a verdict. You choose how much of it to fetch with ?view= and ?include=. See Reading the report.

Pricing in one line

Usage is metered in credits, 150 credits per 250 words, from the same balance as a Silvertext plan. Your first key comes with 1,500 free starter credits (about 2,500 words). Credit packs are pay as you go and never expire; the API page has the packs and per-1,000-word prices.