signatureapi-com

SignatureAPI provides a modern electronic signature API that enables developers to integrate e‑signatures into applications and workflows at scale. The platform offers API endpoints for document creation, template management, envelope handling, and compliance features such as HIPAA, SOC2, GDPR, and CCPA. It includes AI Toolkit integrations, low‑cost pricing, and extensive documentation, making it suitable for businesses seeking automated signing solutions.

signatureapi-com publishes 7 API contracts indexed on the APIs.io network, including Deliverables API, Envelopes API, Events API, and 4 more. Tagged areas include Company, ElectronicSignature, API, SaaS, and Compliance.

The signatureapi-com catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

signatureapi-com’s developer surface includes authentication, support, pricing, documentation, changelog, engineering blog, getting-started guide, and 26 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

69.3/100 exemplar Agent 55/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 5 Agent Skills

CompanyElectronicSignatureAPISaaSCompliance Automation

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 69.3/100 · exemplar

Contract Quality 15.2 / 21

Developer Ergonomics 12.0 / 17

Access Clarity 10.2 / 17

Operational Transparency 6.5 / 11

Contract Governance 8.1 / 10

Discoverability 5.8 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 55/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter

1 more unmet check in the Agent Readiness table above.

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

Access Clarity scores 60.0 — up to +8.0 composite points
Contract Quality scores 71.5 — up to +7.1 composite points
Developer Ergonomics scores 70.7 — up to +5.9 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/signatureapi-com/apis.yml: open an issue on github.com/api-evangelist/signatureapi-com 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 →

APIs 7

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

signatureapi-com Deliverables API

A **deliverable** is the final signed PDF generated after an envelope completes. It contains the signed documents and an audit trail.

signatureapi-com Envelopes API

An **envelope** holds documents and recipients, and manages the signing process from start to finish. Create an envelope to send documents for signature.

signatureapi-com Events API

An **event** records a change or action in your account. Events are delivered via webhooks and available through the API.

signatureapi-com Recipients API

A **recipient** is a person who receives an envelope. Recipients can be signers, approvers, or preparers.

signatureapi-com Senders API

The Senders API from signatureapi-com — 2 operation(s) for senders.

signatureapi-com Uploads API

An **upload** is a file stored in SignatureAPI for use as a document source in envelopes. Supports PDF, DOCX, and image files.

signatureapi-com Webhooks API

The Webhooks API from signatureapi-com — 0 operation(s) for webhooks.

Scroll for all 7

Agent Skills 5

Packaged agent skills for driving this provider's APIs from an AI assistant.

signatureapi-com-create-and-retrieve-deliverable

AGENT SKILL

signatureapi-com-envelope-workflow

AGENT SKILL

signatureapi-com-resend-recipient-request

AGENT SKILL

signatureapi-com-send-sender-lifecycle

AGENT SKILL

signatureapi-com-upload-file

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Signatureapi Com Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Signatureapi Com Rate Limits

2 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Signatureapi Com Webhooks

ASYNCAPI

Semantic Vocabularies 1

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

Signatureapi Com Context

116 classes · 107 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

signatureapi-com API Rules

17 rules · 15 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

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

Envelope

15 properties

JSON SCHEMA

Envelope

22 properties

JSON SCHEMA

Envelope Event

0 properties

JSON SCHEMA

Event

0 properties

JSON SCHEMA

Event.RecipientEvent

0 properties

JSON SCHEMA

Recipient

0 properties

JSON SCHEMA

Security Posture 2

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

Signatureapi Com Authentication

1 scheme

SECURITY

Signatureapi Com Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Signatureapi Com Agentic Access

23 operations · 12 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

DeveloperPortal

DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

Conventions

ErrorCatalog

Conformance

Scroll for all 8

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

RateLimits

Support

StatusPage

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: signatureapi-com
name: signatureapi-com
image: https://signatureapi.com/og-image.jpg
description: SignatureAPI provides a modern electronic signature API that enables developers to integrate e‑signatures into
  applications and workflows at scale. The platform offers API endpoints for document creation, template management, envelope
  handling, and compliance features such as HIPAA, SOC2, GDPR, and CCPA. It includes AI Toolkit integrations, low‑cost pricing,
  and extensive documentation, making it suitable for businesses seeking automated signing solutions.
url: https://artifacts.apis.io/signatureapi-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Company
- ElectronicSignature
- API
- SaaS
- Compliance
- Automation
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/signatureapi-com-agentic-access.yml
- type: RateLimits
  url: rate-limits/signatureapi-com-rate-limits.yml
- type: Plans
  url: plans/signatureapi-com-plans-pricing.yml
- type: Spectral
  url: rules/signatureapi-com-rules.yml
- type: JSONLD
  url: json-ld/signatureapi-com-context.jsonld
- type: Vocabulary
  url: vocabulary/signatureapi-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/signatureapi-com-webhooks.yml
- type: DataModel
  url: data-model/signatureapi-com-data-model.yml
- type: Conventions
  url: conventions/signatureapi-com-conventions.yml
- type: Authentication
  url: authentication/signatureapi-com-authentication.yml
- type: ErrorCatalog
  url: errors/signatureapi-com-problem-types.yml
- type: Conformance
  url: conformance/signatureapi-com-conformance.yml
- type: LLMsTxt
  url: llms/signatureapi-com-llms.txt
- type: WellKnown
  url: well-known/signatureapi-com-well-known.yml
- type: Hosts
  url: hosts/signatureapi-com-hosts.yml
- type: Vendors
  url: vendors/signatureapi-com-vendors.yml
- type: SDKs
  url: packages/signatureapi-com-packages.yml
- type: Packages
  url: packages/signatureapi-com-packages.yml
- type: TermsOfService
  url: https://signatureapi.com/terms
- type: Support
  url: https://signatureapi.com/support
- type: StatusPage
  url: https://signatureapi.com/status
- type: PrivacyPolicy
  url: https://signatureapi.com/privacy
- type: Pricing
  url: https://signatureapi.com/pricing
- type: Newsroom
  url: https://signatureapi.com/news
- type: Documentation
  url: https://signatureapi.com/docs/api/guides/overview
- type: ChangeLog
  url: https://signatureapi.com/changelog
- type: Blog
  url: https://signatureapi.com/blog
- type: GettingStarted
  url: https://signatureapi.com/docs/api/guides/quickstart
- type: DeveloperPortal
  url: https://api.signatureapi.com</code
- type: APIReference
  url: https://signatureapi.com/llms-full.txt
- type: DomainSecurity
  url: security/signatureapi-com-domain-security.yml
- type: Website
  url: https://signatureapi.com/
apis:
- aid: signatureapi-com:signatureapi-com-deliverables-api
  name: signatureapi-com Deliverables API
  description: A **deliverable** is the final signed PDF generated after an envelope completes. It contains the signed documents
    and an audit trail.
  humanURL: https://signatureapi.com/docs/api/welcome
  baseURL: https://api.signatureapi.com/v1
  tags:
  - Deliverables
  properties:
  - type: OpenAPI
    url: openapi/signatureapi-com-deliverables-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-envelope-context-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-input-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-recipient-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-recipient-recipient-schema.json
- aid: signatureapi-com:signatureapi-com-envelopes-api
  name: signatureapi-com Envelopes API
  description: An **envelope** holds documents and recipients, and manages the signing process from start to finish. Create
    an envelope to send documents for signature.
  humanURL: https://signatureapi.com/docs/api/welcome
  baseURL: https://api.signatureapi.com/v1
  tags:
  - Envelopes
  properties:
  - type: OpenAPI
    url: openapi/signatureapi-com-envelopes-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-envelope-context-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-input-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-recipient-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-recipient-recipient-schema.json
- aid: signatureapi-com:signatureapi-com-events-api
  name: signatureapi-com Events API
  description: An **event** records a change or action in your account. Events are delivered via webhooks and available through
    the API.
  humanURL: https://signatureapi.com/docs/api/welcome
  baseURL: https://api.signatureapi.com/v1
  tags:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/signatureapi-com-events-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-envelope-context-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-input-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-recipient-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-recipient-recipient-schema.json
- aid: signatureapi-com:signatureapi-com-recipients-api
  name: signatureapi-com Recipients API
  description: A **recipient** is a person who receives an envelope. Recipients can be signers, approvers, or preparers.
  humanURL: https://signatureapi.com/docs/api/welcome
  baseURL: https://api.signatureapi.com/v1
  tags:
  - Recipients
  properties:
  - type: OpenAPI
    url: openapi/signatureapi-com-recipients-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-envelope-context-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-input-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-recipient-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-recipient-recipient-schema.json
- aid: signatureapi-com:signatureapi-com-senders-api
  name: signatureapi-com Senders API
  description: The Senders API from signatureapi-com — 2 operation(s) for senders.
  humanURL: https://signatureapi.com/docs/api/welcome
  baseURL: https://api.signatureapi.com/v1
  tags:
  - Senders
  properties:
  - type: OpenAPI
    url: openapi/signatureapi-com-senders-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-envelope-context-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-input-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-recipient-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-recipient-recipient-schema.json
- aid: signatureapi-com:signatureapi-com-uploads-api
  name: signatureapi-com Uploads API
  description: An **upload** is a file stored in SignatureAPI for use as a document source in envelopes. Supports PDF, DOCX,
    and image files.
  humanURL: https://signatureapi.com/docs/api/welcome
  baseURL: https://api.signatureapi.com/v1
  tags:
  - Uploads
  properties:
  - type: OpenAPI
    url: openapi/signatureapi-com-uploads-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-envelope-context-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-input-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-recipient-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-recipient-recipient-schema.json
- aid: signatureapi-com:signatureapi-com-webhooks-api
  name: signatureapi-com Webhooks API
  description: The Webhooks API from signatureapi-com — 0 operation(s) for webhooks.
  humanURL: https://signatureapi.com/docs/api/welcome
  baseURL: https://api.signatureapi.com/v1
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/signatureapi-com-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-envelope-context-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-envelope-envelope-input-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-event-recipient-event-schema.json
  - type: JSONSchema
    url: json-schema/signatureapi-com-recipient-recipient-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 37
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

signatureapi-com — frequently asked questions

Does signatureapi-com have an API?

Yes. APIs.io lists 7 APIs from signatureapi-com, including signatureapi-com Deliverables API, signatureapi-com Envelopes API and signatureapi-com Events API, and 4 more.

Is there an OpenAPI specification for the signatureapi-com?

Yes. APIs.io indexes 7 OpenAPI specifications for signatureapi-com, each linked for download from this page.

How do I authenticate with the signatureapi-com?

signatureapi-com documents its authentication (1 scheme). The details are profiled on APIs.io as Signatureapi Com Authentication.

How much does the signatureapi-com cost?

APIs.io lists 3 pricing plans for signatureapi-com, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the signatureapi-com ready for AI agents?

signatureapi-com has a Kin Score of 69.3 out of 100 (exemplar) and an Agent Readiness score of 55.3 (agent-ready), scored by API Evangelist on 2026-10-31.

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