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
# 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 per 250 words, priced by the checks you turn on: 40 credits for every check plus the passes on it, 110 for plagiarism only and 150 with everything on, from the same balance as a Silvertext plan. Your first key comes with 1,500 free starter credits (about 2,500 words with everything on, more with fewer checks). Credit packs are pay as you go and never expire; the API page has the packs and per-1,000-word prices.