Zatanna

Zatanna is a Y Combinator (W2026) startup based in San Francisco that creates APIs for software that doesn't have any. It reverse-engineers the back ends of web-based cloud and on-prem software — ERPs (SAP), PMS/POS systems, insurance portals, and marketplaces — by observing real workflows, reconstructing the underlying request sequences, and hosting them as clean, callable APIs. Rather than relying on slow browser automation or computer-use agents, Zatanna gives AI agents faster, cheaper, and more reliable integrations, with a reliability layer that handles session management, authentication, and change detection. The agent-facing surface is a hosted, OAuth-protected Model Context Protocol (MCP) server at api.zatanna.ai.

Zatanna is listed with 1 API on the APIs.io network. Tagged areas include Company, MCP, AI Agents, Integration, and Reverse Engineering.

Zatanna’s developer surface includes engineering blog and 6 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

19.6/100 emerging ▬ flat Agent 27/100 agent aware Front door AI 4/6 moderate saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 1 MCP Servers

Company MCP AI Agents IntegrationReverse EngineeringAutomation OAuth Y Combinator Authentication

Kin Score

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

Composite quality — 19.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 6.4 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 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 0 / 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 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)

8 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 14.3 — up to +17.1 composite points
Access Clarity scores 21.1 — up to +15.8 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/zatanna/apis.yml: open an issue on github.com/api-evangelist/zatanna 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 4

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)

OAuth

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

Zatanna MCP Server

Zatanna's hosted, remote Model Context Protocol (MCP) server — the agent-facing surface of its reverse-engineered portal integrations. Live at https://api.zatanna.ai/mcp over St...

MCP Servers 1

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

Zatanna MCP Server

Zatanna operates a hosted, remote MCP server at https://api.zatanna.ai/mcp. The endpoint is live: an unauthenticated POST returns HTTP 401 with a WWW-Authenticate Bearer challen...

MCP SERVER

Security Posture 2

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

Zatanna Authentication

oauth2/http · 2 schemes

SECURITY

Zatanna Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Zatanna Scopes

4 scopes

SCOPES

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Source (apis.yml)

aid: zatanna
name: Zatanna
description: Zatanna is a Y Combinator (W2026) startup based in San Francisco that creates APIs for software that doesn't
  have any. It reverse-engineers the back ends of web-based cloud and on-prem software — ERPs (SAP), PMS/POS systems, insurance
  portals, and marketplaces — by observing real workflows, reconstructing the underlying request sequences, and hosting them
  as clean, callable APIs. Rather than relying on slow browser automation or computer-use agents, Zatanna gives AI agents
  faster, cheaper, and more reliable integrations, with a reliability layer that handles session management, authentication,
  and change detection. The agent-facing surface is a hosted, OAuth-protected Model Context Protocol (MCP) server at api.zatanna.ai.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - scopes
  - security
  generated: '2026-11-06'
  method: derived
image: https://raw.githubusercontent.com/api-evangelist/zatanna/refs/heads/main/apis.yml
url: https://raw.githubusercontent.com/api-evangelist/zatanna/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-yc-batch: W2026
x-location: San Francisco, CA
x-founders:
- Tarun Vedula (CEO)
- Alex Blackwell (CTO)
- Rithvik Vanga
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 9
  pass: local-v1
tags:
- Company
- MCP
- AI Agents
- Integration
- Reverse Engineering
- Automation
- OAuth
- Y Combinator
- Authentication
tags_raw:
- Company
- API
- MCP
- AI Agents
- Integration
- Reverse Engineering
- Automation
- OAuth
- Y Combinator
- Authentication
apis:
- name: Zatanna MCP Server
  description: Zatanna's hosted, remote Model Context Protocol (MCP) server — the agent-facing surface of its reverse-engineered
    portal integrations. Live at https://api.zatanna.ai/mcp over Streamable HTTP (JSON-RPC), gated by OAuth 2.0 (Authorization
    Code + PKCE, dynamic client registration) or a Zatanna API key. The tool list is not enumerable without credentials.
  humanURL: https://www.zatanna.ai/
  baseURL: https://api.zatanna.ai
  tags:
  - MCP
  - AI Agents
  - OAuth
  - Authentication
  tags_raw:
  - MCP
  - AI Agents
  - OAuth
  - Authentication
  properties:
  - type: MCPServer
    url: mcp/zatanna-mcp.yml
  - type: Authentication
    url: authentication/zatanna-authentication.yml
  - type: OAuthScopes
    url: scopes/zatanna-scopes.yml
  - type: Conformance
    url: conformance/zatanna-conformance.yml
common:
- url: https://www.zatanna.ai/articles
  type: Blog
- type: Website
  url: https://www.zatanna.ai/
- type: TermsOfService
  url: https://www.zatanna.ai/terms
- type: PrivacyPolicy
  url: https://www.zatanna.ai/privacy
- type: WellKnown
  url: well-known/zatanna-well-known.yml
- type: LLMsTxt
  url: llms/zatanna-llms.txt
- type: DomainSecurity
  url: security/zatanna-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io

Zatanna API — frequently asked questions

Does Zatanna have an API?

Yes. APIs.io lists 1 API from Zatanna, including Zatanna MCP Server.

How do I authenticate with the Zatanna API?

Zatanna documents its authentication (oauth2/http · 2 schemes). The details are profiled on APIs.io as Zatanna Authentication.

Does Zatanna have an MCP server?

Yes. APIs.io lists 1 MCP server for Zatanna: Zatanna operates a hosted, remote MCP server at https://api.zatanna.ai/mcp. The endpoint is live: an unauthenticated POST returns HTTP 401 with a WWW-Authenticate Bearer challenge pointing at the RFC

Is the Zatanna API ready for AI agents?

Zatanna has a Kin Score of 19.6 out of 100 (emerging) and an Agent Readiness score of 27.3 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

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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.
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apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
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