BoldSign website screenshot

BoldSign

BoldSign is an e-signature platform built by Syncfusion that provides a REST API for sending documents for electronic signature, managing reusable templates, tracking envelope status, and embedding signing and requesting workflows directly into third-party applications. The API supports both API key and OAuth 2.0 authentication and outputs JSON responses across US, EU, CA, and AU regional endpoints. BoldSign offers official SDKs for .NET, Python, Java, Node.js, and PHP, along with a free sandbox environment, a Postman collection, and an interactive API Explorer. The platform is SOC 2 Type II, HIPAA, GDPR, and eIDAS compliant, and supports webhooks for real-time event notifications.

BoldSign publishes 11 APIs on the APIs.io network, including Branding API, Contacts API, Custom Field API, and 8 more. Tagged areas include E-Signature, Electronic Signature, Document Management, Embedded Signing, and Webhooks.

The BoldSign catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

BoldSign’s developer surface includes authentication, documentation, engineering blog, pricing, sandbox, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
49.6/100 developing ▬ flat Agent 38/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
11 APIs
E-SignatureElectronic SignatureDocument ManagementEmbedded SigningWebhooksTemplatesIdentity VerificationCompliance

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 49.6/100 · developing
Contract Quality 16.8 / 25
Developer Ergonomics 5.7 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 2.7 / 13
Governance 7.0 / 12
Discoverability 7.4 / 10
Agent readiness — 38/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/boldsign: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 11

Individual APIs this provider publishes, each with its own machine-readable definition.

BoldSign Branding API

The Branding API from BoldSign — 6 operation(s) for branding.

BoldSign Contacts API

The Contacts API from BoldSign — 5 operation(s) for contacts.

BoldSign Custom Field API

The Custom Field API from BoldSign — 5 operation(s) for custom field.

BoldSign Document API

The Document API from BoldSign — 25 operation(s) for document.

BoldSign GroupContacts API

The GroupContacts API from BoldSign — 5 operation(s) for groupcontacts.

BoldSign Identity Verification API

The Identity Verification API from BoldSign — 3 operation(s) for identity verification.

BoldSign Plan API

The Plan API from BoldSign — 1 operation(s) for plan.

BoldSign Sender Identities API

The Sender Identities API from BoldSign — 7 operation(s) for sender identities.

BoldSign Teams API

The Teams API from BoldSign — 4 operation(s) for teams.

BoldSign Template API

The Template API from BoldSign — 16 operation(s) for template.

BoldSign User API

The User API from BoldSign — 8 operation(s) for user.

Scroll for all 11

Pricing Plans 1

Published pricing tiers and plan structures.

Boldsign Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Boldsign Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Boldsign Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Boldsign Context

22 classes · 37 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

BoldSign API Rules

6 rules · 4 warnings 2 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

BoldSign API Schemas

0 properties

JSON SCHEMA

Examples 4

Example request and response payloads for these APIs.

Boldsign Create Embedded Request Url Example

4 fields

EXAMPLE

Boldsign Create Template Example

4 fields

EXAMPLE

Boldsign Get Document Properties Example

4 fields

EXAMPLE

Boldsign Send Document Example

4 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Boldsign Authentication

apiKey · 2 schemes

SECURITY

Boldsign Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Boldsign Agentic Access

85 operations · 60 acting · 2 human-in-the-loop

85 operations · 60 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Sandbox
Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

StatusPage
StatusPage
 RateLimits
RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

Website
Website
 LinkedIn
LinkedIn
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

X
X

Source (apis.yml)

apis.yml Raw ↑ 
aid: boldsign
name: BoldSign
type: Index
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/boldsign.png
url: https://raw.githubusercontent.com/api-evangelist/boldsign/refs/heads/main/apis.yml
created: 2026-06-12
modified: 2026-06-12
specificationVersion: '0.19'
description: 'BoldSign is an e-signature platform built by Syncfusion that provides a REST API for sending documents for electronic
  signature, managing reusable templates, tracking envelope status, and embedding signing and requesting workflows directly
  into third-party applications. The API supports both API key and OAuth 2.0 authentication and outputs JSON responses across
  US, EU, CA, and AU regional endpoints. BoldSign offers official SDKs for .NET, Python, Java, Node.js, and PHP, along with
  a free sandbox environment, a Postman collection, and an interactive API Explorer. The platform is SOC 2 Type II, HIPAA,
  GDPR, and eIDAS compliant, and supports webhooks for real-time event notifications.

  '
tags:
- E-Signature
- Electronic Signature
- Document Management
- Embedded Signing
- Webhooks
- Templates
- Identity Verification
- Compliance
apis:
- aid: boldsign:boldsign-branding-api
  name: BoldSign Branding API
  description: The Branding API from BoldSign — 6 operation(s) for branding.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Branding
  properties:
  - type: OpenAPI
    url: openapi/boldsign-branding-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-contacts-api
  name: BoldSign Contacts API
  description: The Contacts API from BoldSign — 5 operation(s) for contacts.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/boldsign-contacts-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-custom-field-api
  name: BoldSign Custom Field API
  description: The Custom Field API from BoldSign — 5 operation(s) for custom field.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Custom Field
  properties:
  - type: OpenAPI
    url: openapi/boldsign-custom-field-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-document-api
  name: BoldSign Document API
  description: The Document API from BoldSign — 25 operation(s) for document.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Document
  properties:
  - type: OpenAPI
    url: openapi/boldsign-document-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-groupcontacts-api
  name: BoldSign GroupContacts API
  description: The GroupContacts API from BoldSign — 5 operation(s) for groupcontacts.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - GroupContacts
  properties:
  - type: OpenAPI
    url: openapi/boldsign-groupcontacts-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-identity-verification-api
  name: BoldSign Identity Verification API
  description: The Identity Verification API from BoldSign — 3 operation(s) for identity verification.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Identity Verification
  properties:
  - type: OpenAPI
    url: openapi/boldsign-identity-verification-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-plan-api
  name: BoldSign Plan API
  description: The Plan API from BoldSign — 1 operation(s) for plan.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Plan
  properties:
  - type: OpenAPI
    url: openapi/boldsign-plan-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-sender-identities-api
  name: BoldSign Sender Identities API
  description: The Sender Identities API from BoldSign — 7 operation(s) for sender identities.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Sender Identities
  properties:
  - type: OpenAPI
    url: openapi/boldsign-sender-identities-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-teams-api
  name: BoldSign Teams API
  description: The Teams API from BoldSign — 4 operation(s) for teams.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Teams
  properties:
  - type: OpenAPI
    url: openapi/boldsign-teams-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-template-api
  name: BoldSign Template API
  description: The Template API from BoldSign — 16 operation(s) for template.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - Template
  properties:
  - type: OpenAPI
    url: openapi/boldsign-template-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
- aid: boldsign:boldsign-user-api
  name: BoldSign User API
  description: The User API from BoldSign — 8 operation(s) for user.
  humanURL: https://developers.boldsign.com/
  baseURL: https://api.boldsign.com
  tags:
  - User
  properties:
  - type: OpenAPI
    url: openapi/boldsign-user-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/boldsign-esignature-openapi.yml
  - type: JSONSchema
    url: json-schema/boldsign-schemas.json
  - type: JSONLDContext
    url: json-ld/boldsign-context.jsonld
  - type: Vocabulary
    url: vocabulary/boldsign-vocabulary.yml
  - type: Postman
    url: https://developers.boldsign.com/api-overview/api-explorer/
common:
- type: AgenticAccess
  url: agentic-access/boldsign-agentic-access.yml
- type: DomainSecurity
  url: security/boldsign-domain-security.yml
- type: Authentication
  url: authentication/boldsign-authentication.yml
- type: Website
  url: https://boldsign.com/esignature-api/
- type: Documentation
  url: https://developers.boldsign.com/
- type: GitHubOrganization
  url: https://github.com/boldsign
- type: LinkedIn
  url: https://www.linkedin.com/showcase/bold-sign-app/
- type: X
  url: https://twitter.com/boldsignapp
- type: Blog
  url: https://boldsign.com/blogs/
- type: Pricing
  url: https://boldsign.com/electronic-signature-pricing/
- type: StatusPage
  url: https://status.boldsign.com/
- type: Sandbox
  url: https://developers.boldsign.com/api-overview/getting-started/
- type: Plans
  url: plans/boldsign-plans-pricing.yml
- type: RateLimits
  url: rate-limits/boldsign-rate-limits.yml
- type: FinOps
  url: finops/boldsign-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com