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

🌐 Visit website 📡 Source on GitHub

16.4/100 emerging ▬ flat Agent 27/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessSelf serve

1 APIs 1 MCP Servers

Company MCP AI Agents IntegrationReverse EngineeringAutomation Authentication Y Combinator

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 16.4/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 2.4 / 20

Access Clarity 4.2 / 20

Operational Transparency 0.0 / 13

Contract Governance 2.2 / 12

Discoverability 7.6 / 10

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

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.

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 github.com/api-evangelist/zatanna: open an issue to ask a question, or submit a pull request to add artifacts. 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.

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 1

The organization behind the API

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: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  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: '2026-07-21'
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 9
  pass: local-v1
tags:
- Company
- MCP
- AI Agents
- Integration
- Reverse Engineering
- Automation
- Authentication
- Y Combinator
tags_raw:
- Company
- API
- MCP
- AI Agents
- Integration
- Reverse Engineering
- Automation
- OAuth
- Y Combinator
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
  - Authentication
  tags_raw:
  - MCP
  - AI Agents
  - OAuth
  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:
- 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

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