E-Sign

E‑Sign provides secure, advanced electronic signature solutions for UK and EU organisations, offering legally‑binding, audit‑ready signatures that meet industry regulations such as eIDAS, GDPR, and sector‑specific standards. Their platform supports high‑value transactions across healthcare, finance, legal, government and education, with features like digital certificates, electronic seals, identity verification, and integrated payment processing. The service includes a robust API, extensive integrations (e.g., Microsoft Dynamics, Salesforce, Zapier), and a compliance‑focused Trust Centre, aiming to protect data residency in ISO‑27001‑certified UK data centres.

E-Sign is profiled on the APIs.io network. Tagged areas include Company, ElectronicSignature, Compliance, API, and UK.

E-Sign’s developer surface includes signup flow, pricing, support, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

21.8/100 emerging Agent 3/100 human only Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

0 APIs

CompanyElectronicSignatureComplianceAPIUK

Kin Score

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

Composite quality — 21.8/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 0.8 / 17

Access Clarity 13.0 / 17

Operational Transparency 1.2 / 11

Contract Governance 0.0 / 10

Discoverability 3.8 / 9

Regulatory Posture 2.1 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 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

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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<a href="https://apis.io/providers/e-sign/"><img src="https://apis.io/badge/e-sign/card.svg" alt="E-Sign on APIs.io — Kin Score by API Evangelist"></a>

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

12 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 4.8 — up to +19.0 composite points
Contract Governance scores 0.0 — up to +12.0 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/e-sign/apis.yml: open an issue on github.com/api-evangelist/e-sign 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 →

Pricing Plans 1

Published pricing tiers and plan structures.

E Sign Plans Pricing

4 plans

PLANS

Security Posture 1

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

E Sign Domain Security

TLSv1.2 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

TermsOfService

PrivacyPolicy

Plans

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: e-sign
name: E-Sign
description: E‑Sign provides secure, advanced electronic signature solutions for UK and EU organisations, offering legally‑binding,
  audit‑ready signatures that meet industry regulations such as eIDAS, GDPR, and sector‑specific standards. Their platform
  supports high‑value transactions across healthcare, finance, legal, government and education, with features like digital
  certificates, electronic seals, identity verification, and integrated payment processing. The service includes a robust
  API, extensive integrations (e.g., Microsoft Dynamics, Salesforce, Zapier), and a compliance‑focused Trust Centre, aiming
  to protect data residency in ISO‑27001‑certified UK data centres.
url: https://raw.githubusercontent.com/api-evangelist/e-sign/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-20 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-20'
modified: '2026-10-20'
tags:
- Company
- ElectronicSignature
- Compliance
- API
- UK
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: TermsOfService
  url: https://esign.co.uk/terms-of-use/
- type: PrivacyPolicy
  url: https://esign.co.uk/privacy/
- type: Plans
  url: plans/e-sign-plans-pricing.yml
- type: LLMsTxt
  url: llms/e-sign-llms.txt
- type: Hosts
  url: hosts/e-sign-hosts.yml
- type: Vendors
  url: vendors/e-sign-vendors.yml
- type: SignUp
  url: https://www.esign.co.uk/register/
- type: Security
  url: https://www.esign.co.uk/resources/security/
- type: DomainSecurity
  url: security/e-sign-domain-security.yml
- type: Website
  url: https://e-sign.co.uk/
- type: Pricing
  url: https://www.esign.co.uk/pricing/
- type: Support
  url: https://www.esign.co.uk/contact-us/
apis: []
x-coverage:
  state: none
  reason: no-developer-program
  method: derived
  generated: '2026-10-20'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes no developer documentation host and no machine-readable contract on its own domain
  evidence:
  - url: https://e-sign.co.uk/
    status: 200
x-enrichment:
  date: '2026-10-20'
  status: enriched
  artifacts_added: 10
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

E-Sign API — frequently asked questions

How much does the E-Sign API cost?

APIs.io lists 4 pricing plans for E-Sign, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the E-Sign API ready for AI agents?

E-Sign has a Kin Score of 21.8 out of 100 (emerging) and an Agent Readiness score of 2.9 (human-only), scored by API Evangelist on 2026-10-31.

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get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
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resolveTurn a domain, URL or GitHub org into the provider it belongs to.
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Every operation they expose

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How their score was established

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