Zyntra

Zyntra provides a read‑only email testing API that lets developers automate sign‑up, password‑reset, magic‑link and OTP flows. By sending test emails to team‑specific addresses, teams can retrieve email content, links and attachments over a simple REST endpoint. The service includes free tools like SPF/DKIM/DMARC checking, an email header analyzer, and SDKs for popular test frameworks. Plans range from a free tier with 150 emails/month to paid tiers with higher limits and longer retention.

Zyntra publishes 1 API contract indexed on the APIs.io network. Tagged areas include Email Testing, Automated Tests, QA, Password Reset, and Magic Link.

The Zyntra catalog on APIs.io includes 1 Spectral governance ruleset.

Zyntra’s developer surface includes documentation, API reference, getting-started guide, pricing, engineering blog, and 11 more developer resources.

🌐 Visit website📡 Profile data on GitHub
29.1/100 thin ▬ flat Agent 6/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →
AccessFreemiumSelf serve⚡ Free to try
1 published contract 1 MCP Servers 1 Agent Skills
Email TestingAutomated TestsQAPassword ResetMagic Link

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0
Composite quality — 29.1/100 · thin
Contract Quality 1.3 / 21
Developer Ergonomics 6.5 / 17
Access Clarity 10.7 / 17
Operational Transparency 0.0 / 11
Contract Governance 1.9 / 10
Discoverability 4.5 / 9
Regulatory Posture 2.1 / 15
Agent readiness — 6/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 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 5 / 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 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/.
Show this score on your site. Kin Score badge preview for Zyntra It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/zyntra-app/"><img src="https://apis.io/badge/zyntra-app/card.svg" alt="Zyntra on APIs.io — Kin Score by API Evangelist"></a>
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Raise your score.
Agent readiness — checks not met, largest first (exact, from this profile):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • 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)
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
10 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/zyntra-app/apis.yml: open an issue on github.com/api-evangelist/zyntra-app 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 1

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

Zyntra API

Read‑only email testing API allowing automation of sign‑up, password‑reset, magic‑link and OTP flows.

MCP Servers 1

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

Zyntra MCP Server

Remote MCP server at mcp.zyntra.app requiring an API key.

MCP SERVER

Agent Skills 1

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

email-management

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Zyntra App Plans Pricing

3 plans

PLANS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Zyntra API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Zyntra App Openapi Overlay

0 actions · update

UNRECORDED

Security Posture 2

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

Zyntra App Authentication

apiKey · 1 scheme

SECURITY

Zyntra App Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Zyntra App Agentic Access

5 operations · 1 acting

5 operations · 1 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs
SDKs
 Packages
Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans
Plans
 Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: zyntra-app
name: Zyntra
description: Zyntra provides a read‑only email testing API that lets developers automate sign‑up, password‑reset, magic‑link
  and OTP flows. By sending test emails to team‑specific addresses, teams can retrieve email content, links and attachments
  over a simple REST endpoint. The service includes free tools like SPF/DKIM/DMARC checking, an email header analyzer, and
  SDKs for popular test frameworks. Plans range from a free tier with 150 emails/month to paid tiers with higher limits and
  longer retention.
url: https://artifacts.apis.io/zyntra-app/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)
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
  probe_state: unreadable
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Email Testing
- Automated Tests
- QA
- Password Reset
- Magic Link
tags_raw:
- Email Testing
- Automated Tests
- QA
- API
- Password Reset
- Magic Link
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/zyntra-app-plans-pricing.yml
- type: LLMsTxt
  url: llms/zyntra-app-llms.txt
- type: MCPServer
  url: mcp/zyntra-app-mcp.yml
- type: Hosts
  url: hosts/zyntra-app-hosts.yml
- type: Vendors
  url: vendors/zyntra-app-vendors.yml
- type: SDKs
  url: packages/zyntra-app-packages.yml
- type: Packages
  url: packages/zyntra-app-packages.yml
- type: DomainSecurity
  url: security/zyntra-app-domain-security.yml
- type: Website
  url: https://zyntra.app/
- type: Documentation
  url: https://docs.zyntra.app
- type: APIReference
  url: https://docs.zyntra.app/api
- type: GettingStarted
  url: https://docs.zyntra.app/getting-started
- type: Pricing
  url: https://zyntra.app/pricing
- type: Blog
  url: https://zyntra.app/blog
- type: TermsOfService
  url: https://zyntra.app/terms
- type: PrivacyPolicy
  url: https://zyntra.app/privacy-policy
apis:
- name: Zyntra API
  description: Read‑only email testing API allowing automation of sign‑up, password‑reset, magic‑link and OTP flows.
  humanURL: https://docs.zyntra.app/api
  aid: zyntra-app:zyntra-api
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Docs are served as a JavaScript SPA, preventing machine‑readable spec discovery.
  evidence:
  - url: https://docs.zyntra.app
    status: 200
  checked: '2026-10-31'
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 12
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Zyntra API — frequently asked questions

Does Zyntra have an API?

Yes. APIs.io lists 1 API from Zyntra, including Zyntra API.

How do I authenticate with the Zyntra API?

Zyntra documents its authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Zyntra App Authentication.

How much does the Zyntra API cost?

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

Does Zyntra have an MCP server?

Yes. APIs.io lists 1 MCP server for Zyntra: Remote MCP server at mcp.zyntra.app requiring an API key.

Is the Zyntra API ready for AI agents?

Zyntra has a Kin Score of 29.1 out of 100 (thin) and an Agent Readiness score of 5.9 (agent-aware), scored by API Evangelist on 2026-11-02.

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