Esig API review
A connector-friendly signing API with embedded workflows, webhooks, and templates.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Esig API is an electronic-signature service built around REST endpoints for creating, sending, voiding, deleting, and tracking envelopes. It suits teams connecting agreement workflows to custom applications, portals, and business systems. Personal access tokens support API authentication, while embedded signing can run in an iframe or portal. The product also covers reusable templates, reminders, audit events, completion records, PowerForms, conditional fields, and optional government photo ID verification.
Its ecosystem fit is a central strength. Esig lists connections for Slack, Google, Outlook, HubSpot, Stripe, Notion, Dropbox, Salesforce, Zapier, Microsoft Teams, and QuickBooks. That gives teams several paths for connecting signatures with communication, customer management, payments, storage, automation, and accounting workflows. The API includes HTTPS lifecycle webhooks, making it suitable for applications that need status updates after signing events. Bulk sending supports up to 50 recipients, while PowerForms provide self-service signing links.
The plan structure determines how much of the platform is available. Personal includes eSignature, audit trail, reminders, and secure storage and access. Standard adds templates, bulk sending, form fields, identity verification, and reminders. Business Pro adds API access, webhooks, bulk sending, templates, PowerForms, and identity verification. Enterprise adds SSO, AI Insights, and custom send limits. The Personal allowance is presented as 5 sends per month in one offer and 1 envelope per month in the pricing table. Choose Esig API when embedded signing, integrations, and developer access matter; teams needing API functionality on the entry plans or advanced enterprise controls should compare alternatives.
Esig API pros and cons
- Where it wins
- Embedded signing, REST endpoints, and lifecycle webhooks
- Templates, PowerForms, form fields, and conditional fields
- 11 integrations plus bulk sending to up to 50 recipients
- Where it doesn't
- API access starts with Business Pro rather than Personal or Standard
- Personal allowance is shown as both 5 sends and 1 envelope per month
- Advanced capabilities such as SSO and AI Insights require Enterprise
Esig API fact sheet, pricing and score →
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