API
Send documents for signature and track them from your own systems with the instaSpace REST API.
The instaSpace API lets external systems work with your workspace's e-sign templates: list them, send signature requests, poll their status, and download the signed documents. It's how you connect instaSpace to a CRM, an intake tool, or an internal workflow that produces contracts.
Two things shape how an integration is built. Templates are prepared in the
app and sent from through the API, so the first step is always publishing one.
And there are no outbound webhooks yet — you poll, which is cheap and
predictable as long as you stop on every terminal status and not just
completed.
All endpoints live under a single base URL:
https://api.instaspace.ai/api/v1Authentication
Create a workspace API key and use it as a Bearer token.
Templates
List the published templates you can send from.
Signature requests
Send a template for signature, poll status, list requests, download the result.
Errors & limits
Status codes, rate limits, and monthly plan allowances.
API reference
Every endpoint, its parameters and its responses — generated from the API itself, so it is never out of date.
Reference
The pages here explain how the API fits together. For the exact shape of every
endpoint — parameters, request bodies, response fields, status codes — use the
API reference, which is generated from
the running API rather than written by hand, and covers only the endpoints a
workspace key can call. The machine-readable schema is at
/api/v1/openapi.json if you
want to generate a client.
The reference can send real requests. Reading endpoints are safe to try, but POST /esign/submissions genuinely
sends a document — it emails the signers and uses one of your workspace's monthly signature requests. Try that one
from a test workspace.
The API is available on every paid plan — the same plans that include e-signatures in the app. Requests made with a workspace key count against the same monthly signature-request allowance as requests sent from the app.