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 API contracts indexed on the APIs.io network, including Branding API, Contacts API, Custom Field API, and 8 more. Tagged areas include E-Signature, Document Management, Embedded Signing, Webhook, and Templates.

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 📡 Profile data on GitHub

38.0/100 thin ▬ flat Agent 35/100 agent ready Front door AI 6/6 dominant Heartbeat 86/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers

E-Signature Document Management Embedded Signing Webhook Templates Identity Verification Compliance

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 38.0/100 · thin

Contract Quality 12.6 / 19

Developer Ergonomics 3.9 / 15

Access Clarity 2.8 / 15

Operational Transparency 2.3 / 10

Contract Governance 2.1 / 9

Discoverability 5.1 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 35/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 26.2 — up to +14.8 composite points
Operational Transparency scores 23.7 — up to +9.9 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/boldsign/apis.yml: open an issue on github.com/api-evangelist/boldsign to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Biometrics Testing (biometric recognition vendors, identity verification depth)	builds-on	30.7	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

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

Open Collections 11

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

BoldSign Branding API

OPEN COLLECTION

BoldSign Branding Contacts API

OPEN COLLECTION

BoldSign Branding Custom Field API

OPEN COLLECTION

BoldSign Branding Document API

OPEN COLLECTION

BoldSign Branding GroupContacts API

OPEN COLLECTION

BoldSign Branding Identity Verification API

OPEN COLLECTION

BoldSign Branding Plan API

OPEN COLLECTION

BoldSign Branding Sender Identities API

OPEN COLLECTION

BoldSign Branding Teams API

OPEN COLLECTION

BoldSign Branding Template API

OPEN COLLECTION

BoldSign Branding User API

OPEN COLLECTION

Scroll for all 11

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

BoldSign MCP Server

Remote MCP server at mcp.boldsign.com over HTTP.

MCP SERVER

BoldSign API pricing

Not yet checked against BoldSign's own pricing page. Compiled by API Evangelist on 2026-06-12; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Essential free	—
Growth paid	—
Business paid	—
Premium paid	—
Enterprise API metered	—
Free Sandbox free	—

Plan details, limits and sources →

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

2 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

BoldSign

SLA

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 — jsonschema 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 · 59 acting · 2 human-in-the-loop

85 operations · 59 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

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: boldsign
name: BoldSign
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  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: '0.23'
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
- Document Management
- Embedded Signing
- Webhook
- Templates
- Identity Verification
- Compliance
tags_raw:
- E-Signature
- Electronic Signature
- Document Management
- Embedded Signing
- Webhooks
- Templates
- Identity Verification
- Compliance
- Document-Management
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/_original/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/_original/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/_original/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:
  - Documents
  tags_raw:
  - Document
  properties:
  - type: OpenAPI
    url: openapi/boldsign-document-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/_original/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/_original/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/_original/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/_original/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/_original/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:
  - Team
  tags_raw:
  - Teams
  properties:
  - type: OpenAPI
    url: openapi/boldsign-teams-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/_original/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:
  - Templates
  tags_raw:
  - Template
  properties:
  - type: OpenAPI
    url: openapi/boldsign-template-api-openapi.yml
  - type: Documentation
    url: https://developers.boldsign.com/
  - type: OpenAPISpec
    url: openapi/_original/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/_original/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

BoldSign API — frequently asked questions

Does BoldSign have an API?

Yes. APIs.io lists 11 APIs from BoldSign, including BoldSign Branding API, BoldSign Contacts API and BoldSign Custom Field API, and 8 more.

Is there an OpenAPI specification for the BoldSign API?

Yes. APIs.io indexes 11 OpenAPI specifications for BoldSign, each linked for download from this page.

How do I authenticate with the BoldSign API?

BoldSign uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Boldsign Authentication.

How much does the BoldSign API cost?

APIs.io lists 6 pricing plans for BoldSign, with each plan's price, limits and inclusions under Pricing on this page.

Does BoldSign have an MCP server?

Yes. APIs.io lists 1 MCP server for BoldSign: Remote MCP server at mcp.boldsign.com over HTTP.

Is the BoldSign API ready for AI agents?

BoldSign has a Kin Score of 38.0 out of 100 (thin) and an Agent Readiness score of 35.4 (agent-ready), scored by API Evangelist on 2026-11-06.

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