Unified.to

Readandwritesignaturedatainreal-time

Launch 43+ pre-built E-Signature integrations today and access normalized signature data with zero maintenance — all through a unified API.

E-Signature

One request. Every e-signature platform.

Swap the connection_id and the same code reads documents from DocuSign, Adobe Sign, Dropbox Sign or any of 43 e-signature integrations, in one normalized shape. Every call is live against the source API.

curl --get \
  'https://api.unified.to/signing/{connection_id}/document' \
  --data 'limit=1' \
  --header "authorization: bearer $UNIFIED_API_KEY"
Response — same fields for every e-signature platform
[
  {
    "id": "3f9e2c71-8a4b-4d0e",
    "created_at": "2026-10-20T16:00:00.000Z",
    "updated_at": "2026-10-22T10:31:57.000Z",
    "name": "Master services agreement — Foobar Inc.",
    "status": "COMPLETED",
    "sent_at": "2026-10-20T16:05:00.000Z",
    "completed_at": "2026-10-22T10:31:57.000Z",
    "template_id": "tmpl_msa_v3"
  }
]

Start free 30-day trial

No credit card required. Get your API key, connect real accounts, and make live calls like this one in minutes.

The modern Unified API+MCP platform, built differently

Real-time, pass-through

Every request hits the source API live. No caching or sync jobs: reads and writes go to the source API, and native and virtual webhooks report changes on supported integrations.

No customer records at rest

No customer records at rest; connection credentials and operational metadata are encrypted at rest. Each workspace runs in one region: US on every plan, EU or AU on Pro and Scale.

Common objects across every category

Unified objects, endpoints, scopes and errors across every category, plus raw payloads when you need vendor-specific fields.

Custom fields & objects

Read and write custom fields through the Metadata API; reach custom objects through raw fields and the Passthrough API.

AI-ready integrations

Built for AI products: Unified MCP gives LLMs scoped access to integration tools, with options to limit permissions and hide sensitive fields.

Predictable pricing, no lock-in

Usage-based pricing that scales with API volume, not with the number of customers you connect. Own your credentials and export them anytime; tokens issued to your own OAuth app keep refreshing after you leave.

Get integrations from backlog to production in days

1. Activate integrations

Enable integrations across 38 API categories, from Assessment to E-Signature and Clubs

1. Activate integrations

2. Launch integrations

Build, test, and launch multiple integrations simultaneously with only a few lines of code.

2. Launch integrations

3. Authorize integrations

Embed our authorization component to let customers easily link their accounts.

3. Authorize integrations

Authorization handled for you

A pre-built authorization component and API handle each vendor's sign-in, so your code works with a connection ID.

See documentation

Business Login

Sign users in with the software their company already runs on. Redirect them to one Unified URL and get back their verified email and name. No OAuth flows to build, no tokens to store.

Built on OpenID Connect (OIDC), OAuth2, and SAML specifications.

Unified supports 323+ sign-in integrations.

Trusted by developers and product teams worldwide

ThriveLearning.com
Humi.ca
Paidiem.com
HeroHunt.ai
HireTechLadies.com
Sailes.ai
Foresight
Recital
Talin
Sync2Hire
HoneyBook

Build with a unified E-Signature API

Read and write data from multiple E-Signature integrations

Unified Document
Fields:
id created_at updated_at name description status sent_at completed_at expires_at template_id download_url creator_id raw metadata
Methods:
Create a document List all documents Retrieve a document Update a document Remove a document
Unified Signatory
Fields:
id created_at updated_at document_id name email role status order signed_at decline_reason raw metadata
Methods:
Create a signatory List all signatories Retrieve a signatory Update a signatory Remove a signatory
Unified Template
Fields:
id created_at updated_at name description is_active creator_id raw metadata
Methods:
Retrieve a template List all templates

Why our customers choose us

4.9 out of 5 on G2 (28 reviews, as of 21 October 2026)