Build on sign.yt

Send PDFs for signature, track every step with signed webhooks, and download sealed, verifiable documents. One REST API for every organization on the platform.

QuickstartCreate a key, send a PDF for signature and download the sealed result. AuthenticationAPI keys, scopes and how roles combine with them. WebhooksEvents, payloads, HMAC verification and retries. API referenceEvery public endpoint, generated from the OpenAPI spec. Python SDKTyped sync and async client with retries. TypeScript SDKFetch-based client for Node 18+ and browsers. Verification and evidencePAdES seal, audit trail, public verify API. Error codesStable machine-readable codes for every failure.

Your first API call#

All requests go to https://api.sign.yt/v1 and authenticate with an API key in the Authorization header. Create a key in the app under API keys (organization admins only, on plans that include API access), then list your documents:

export SIGNYT_API_KEY="sk_live_..."

curl -sS "https://api.sign.yt/v1/documents?limit=5" \
  -H "Authorization: Bearer $SIGNYT_API_KEY"

import os
from signyt import Signyt

client = Signyt(os.environ["SIGNYT_API_KEY"])
for doc in client.documents.list(limit=5):
    print(doc.id, doc.status, doc.title)

import { Signyt } from "@signyt/sdk";

const client = new Signyt(process.env.SIGNYT_API_KEY!);
const docs = await client.documents.list({ limit: 5 });
for (const d of docs) console.log(d.id, d.status, d.title);

The response is a JSON array of document summaries:

[
  {
    "id": "3f1c2a9e-5b7d-4c11-9a3e-0d4b8e2f6a71",
    "title": "Office lease",
    "status": "PENDING",
    "recipients_count": 2,
    "created_at": "2026-10-19T08:30:12.418204Z",
    "sent_at": "2026-10-19T08:31:02.110931Z",
    "completed_at": null,
    "folder_id": null,
    "team_id": null
  }
]

Install an SDK#

pip install signyt

npm install @signyt/sdk

No SDK for your language? The API is plain HTTPS + JSON (multipart for PDF uploads), so any HTTP client works. See PHP and other languages.

What you can build#

Documents: upload a PDF, add recipients and fields, send, remind, cancel, download the signed PDF and the audit trail. Documents and recipients
Templates: reusable PDFs with field layouts, plus public signing links and QR codes. Templates and public links
Bulk sending: one PDF, one CSV, up to 500 drafts per call. Bulk sending
Flows: multi-step automation with approvals, waits and notifications. Flows
Webhooks: HMAC-signed events for every state change. Webhooks
Evidence: PAdES-sealed PDFs, hash-chained audit log, optional post-quantum seal and Bitcoin anchoring. Verification and evidence

Reference#

Interactive API reference rendered from openapi.json (download it to generate your own client).
Webhook events, error codes and the changelog.