APISign

APISign provides a pay‑per‑contract e‑signature service tailored for AI agents and developers. It offers an MCP server, a REST API and a CLI that let agents draft contracts, send them for legally binding signatures, and track the signing process. Pricing is $0.25 per contract with 20 free contracts to start and no monthly fees. The platform supports Markdown and Word documents, returns sealed PDFs, and includes audit logs for compliance.

APISign publishes 6 API contracts indexed on the APIs.io network, including API Keys API, Contracts API, Health API, and 3 more. Tagged areas include E-Signature, Artificial Intelligence, MCP, Contracts, and Developer Platform.

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

APISign’s developer surface includes CLI, authentication, support, documentation, API reference, getting-started guide, engineering blog, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

54.5/100 strong Agent 46/100 agent ready Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessPaid

1 published contract 2 Agent Skills

E-Signature Artificial Intelligence MCP Contracts Developer Platform

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 54.5/100 · strong

Contract Quality 13.5 / 21

Developer Ergonomics 11.6 / 17

Access Clarity 11.2 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.8 / 15

Agent readiness — 46/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

3 more unmet checks in the Agent Readiness table above.

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

Operational Transparency scores 0.0 — up to +13.0 composite points
Contract Governance scores 22.0 — up to +9.4 composite points
Contract Quality scores 63.7 — up to +9.1 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/apisign-io/apis.yml: open an issue on github.com/api-evangelist/apisign-io 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 →

Standards implemented 3

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

APISign API Keys API

Manage API keys

APISign Contracts API

Create, manage, and track contracts

APISign Health API

Unauthenticated service checks

APISign Organization API

Organization details and audit trail

APISign Templates API

Manage reusable contract templates

APISign Webhooks API

Configure webhook endpoints for events

Agent Skills 2

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

create-contract

AGENT SKILL

list-templates

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Apisign Io Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Apisign Io Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

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

Apisign Io Context

30 classes · 92 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

APISign API Rules

17 rules · 13 errors 3 warnings 1 info

SPECTRAL

JSON Schema 6

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

ContractAuditLog

14 properties

JSON SCHEMA

Contract

18 properties

JSON SCHEMA

CreateContractRequest

9 properties

JSON SCHEMA

Organization

13 properties

JSON SCHEMA

UpdateContractRequest

8 properties

JSON SCHEMA

VerificationResult

6 properties

JSON SCHEMA

Security Posture 2

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

Apisign Io Authentication

1 scheme

SECURITY

Apisign Io Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Apisign Io Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Apisign Io Agentic Access

35 operations · 17 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

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 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

CLI

CLI

SDKs

SDKs

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: apisign-io
name: APISign
description: APISign provides a pay‑per‑contract e‑signature service tailored for AI agents and developers. It offers an MCP
  server, a REST API and a CLI that let agents draft contracts, send them for legally binding signatures, and track the signing
  process. Pricing is $0.25 per contract with 20 free contracts to start and no monthly fees. The platform supports Markdown
  and Word documents, returns sealed PDFs, and includes audit logs for compliance.
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  probe_state: gated
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://apisign.io/android-chrome-512x512.png
url: https://artifacts.apis.io/apisign-io/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- E-Signature
- Artificial Intelligence
- MCP
- Contracts
- Developer Platform
tags_raw:
- e-signature
- AI
- MCP
- contracts
- developer-platform
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/apisign-io-agentic-access.yml
- type: Plans
  url: plans/apisign-io-plans-pricing.yml
- type: Spectral
  url: rules/apisign-io-rules.yml
- type: JSONLD
  url: json-ld/apisign-io-context.jsonld
- type: Vocabulary
  url: vocabulary/apisign-io-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/apisign-io-data-model.yml
- type: CLI
  url: cli/apisign-io-cli.yml
- type: Authentication
  url: authentication/apisign-io-authentication.yml
- type: ErrorCatalog
  url: errors/apisign-io-problem-types.yml
- type: Conformance
  url: conformance/apisign-io-conformance.yml
- type: LLMsTxt
  url: llms/apisign-io-llms.txt
- type: WellKnown
  url: well-known/apisign-io-well-known.yml
- type: Hosts
  url: hosts/apisign-io-hosts.yml
- type: SDKs
  url: packages/apisign-io-packages.yml
- type: Packages
  url: packages/apisign-io-packages.yml
- type: TermsOfService
  url: https://apisign.io/terms
- type: Support
  url: https://apisign.io/support
- type: PrivacyPolicy
  url: https://apisign.io/privacy
- type: DomainSecurity
  url: security/apisign-io-domain-security.yml
- type: Website
  url: https://apisign.io/
- type: Documentation
  url: https://apisign.io/docs
- type: APIReference
  url: https://apisign.io/docs/api/reference
- type: GettingStarted
  url: https://apisign.io/docs
- type: Blog
  url: https://apisign.io/blog
- type: Pricing
  url: https://apisign.io/pricing
- type: SignUp
  url: https://apisign.io/register
apis:
- aid: apisign-io:apisign-io-api-keys-api
  name: APISign API Keys API
  description: Manage API keys
  humanURL: https://apisign.io/docs/api/reference
  baseURL: https://apisign.io/api
  tags:
  - APIKeys
  tags_raw:
  - API Keys
  properties:
  - type: OpenAPI
    url: openapi/apisign-io-api-keys-api-openapi.yml
  - type: JSONSchema
    url: json-schema/apisign-io-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-update-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-organization-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-create-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-audit-log-schema.json
- aid: apisign-io:apisign-io-contracts-api
  name: APISign Contracts API
  description: Create, manage, and track contracts
  humanURL: https://apisign.io/docs/api/reference
  baseURL: https://apisign.io/api
  tags:
  - Contracts
  properties:
  - type: OpenAPI
    url: openapi/apisign-io-contracts-api-openapi.yml
  - type: JSONSchema
    url: json-schema/apisign-io-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-update-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-organization-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-create-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-audit-log-schema.json
- aid: apisign-io:apisign-io-health-api
  name: APISign Health API
  description: Unauthenticated service checks
  humanURL: https://apisign.io/docs/api/reference
  baseURL: https://apisign.io/api
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/apisign-io-health-api-openapi.yml
  - type: JSONSchema
    url: json-schema/apisign-io-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-update-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-organization-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-create-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-audit-log-schema.json
- aid: apisign-io:apisign-io-organization-api
  name: APISign Organization API
  description: Organization details and audit trail
  humanURL: https://apisign.io/docs/api/reference
  baseURL: https://apisign.io/api
  tags:
  - Organization
  properties:
  - type: OpenAPI
    url: openapi/apisign-io-organization-api-openapi.yml
  - type: JSONSchema
    url: json-schema/apisign-io-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-update-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-organization-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-create-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-audit-log-schema.json
- aid: apisign-io:apisign-io-templates-api
  name: APISign Templates API
  description: Manage reusable contract templates
  humanURL: https://apisign.io/docs/api/reference
  baseURL: https://apisign.io/api
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/apisign-io-templates-api-openapi.yml
  - type: JSONSchema
    url: json-schema/apisign-io-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-update-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-organization-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-create-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-audit-log-schema.json
- aid: apisign-io:apisign-io-webhooks-api
  name: APISign Webhooks API
  description: Configure webhook endpoints for events
  humanURL: https://apisign.io/docs/api/reference
  baseURL: https://apisign.io/api
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/apisign-io-webhooks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/apisign-io-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-update-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-organization-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-create-contract-request-schema.json
  - type: JSONSchema
    url: json-schema/apisign-io-contract-audit-log-schema.json
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-11-01'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://apisign.io/mcp
    status: 401
  - url: https://apisign.io/
    status: 200
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 40
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

APISign — frequently asked questions

Does APISign have an API?

Yes. APIs.io lists 6 APIs from APISign, including APISign API Keys API, APISign Contracts API and APISign Health API, and 3 more.

Is there an OpenAPI specification for the APISign?

Yes. APIs.io indexes 6 OpenAPI specifications for APISign, each linked for download from this page.

How do I authenticate with the APISign?

APISign documents its authentication (1 scheme). The details are profiled on APIs.io as Apisign Io Authentication.

How much does the APISign cost?

APIs.io lists 1 pricing plan for APISign, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the APISign ready for AI agents?

APISign has a Kin Score of 54.5 out of 100 (strong) and an Agent Readiness score of 46.1 (agent-ready), scored by API Evangelist on 2026-11-02.

Work with this as data

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find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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