Z League

Z League is an a16z-backed startup that operates the MEGA platform (gomega.ai) — a suite of AI marketing agents that autonomously manage SEO, paid advertising, and website/growth optimization for businesses at a fraction of traditional agency cost. MEGA also ships a built-in CRM, and exposes the MEGA public CRM Lead API: a server-to-server REST API to pull/search leads with cursor pagination, push leads one-at-a-time or in bulk (up to 500) with idempotency and email/phone de-duplication, and register HMAC-signed `lead.created` webhooks. Authentication is an admin-issued, customer-locked, scoped Personal Access Token (Bearer `mega_...`) plus an `x-customer-id` header. The API is documented with an OpenAPI 3.1 spec and a Mintlify developer portal published from the company's public GitHub org (github.com/zleague).

Z League publishes 2 API contracts indexed on the APIs.io network: Leads API and Webhooks API. Tagged areas include Company, CRM, Leads, Marketing, and AI Agents.

The Z League catalog on APIs.io includes 2 event-driven AsyncAPI specifications and 1 Spectral governance ruleset.

Z League’s developer surface includes documentation, API reference, getting-started guide, engineering blog, pricing, signup flow, support, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

48.2/100 developing ▬ flat Agent 41/100 agent native Front door AI 5/6 prominent Heartbeat 80/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract 4 Agent Skills

Company CRM Leads Marketing AI Agents SEO Advertising Webhook Gaming

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management

BC-4270

Webhooks

POST /api/agents/crm/lead-webhooks

Sales Management

BC-410

Leads

GET /api/agents/crm/leads

Kin Score

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

Composite quality — 48.2/100 · developing

Contract Quality 11.4 / 19

Developer Ergonomics 3.1 / 15

Access Clarity 11.4 / 15

Operational Transparency 2.6 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 3.7 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 41/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/z-league/"><img src="https://apis.io/badge/z-league/card.svg" alt="Z League on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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
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
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

4 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 20.8 — up to +15.8 composite points
Contract Quality scores 60.6 — up to +9.9 composite points
Contract Governance scores 18.2 — up to +9.8 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/z-league/apis.yml: open an issue on github.com/api-evangelist/z-league 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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Z League Leads API

The Leads API from Z League — 2 operation(s) for leads.

Z League Webhooks API

The Webhooks API from Z League — 2 operation(s) for webhooks.

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

MEGA Public CRM Lead Leads API

OPEN COLLECTION

MEGA Public CRM Lead Leads Webhooks API

OPEN COLLECTION

Arazzo Workflows 2

Multi-step API workflows described with the Arazzo specification.

MEGA CRM — capture lead and register webhook

Register a lead.created webhook, then create a lead. Real inserts fire the webhook so your endpoint is notified. Uses an Idempotency-Key so the create is retry-safe.

ARAZZO

MEGA CRM — incremental lead sync

Poll the MEGA CRM for leads with stable keyset cursor pagination: fetch the first page sorted by updated_at ascending, then follow next_cursor to fetch the next page.

ARAZZO

Agent Skills 4

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

Bulk-import leads

AGENT SKILL

Push a lead safely (idempotent)

AGENT SKILL

Register and verify a lead.created webhook

AGENT SKILL

Incrementally sync leads

AGENT SKILL

Z League API pricing

Prices published by Z League, read 2026-10-28 from www.gomega.ai/pricing.

Plan	Price
Starter	Schedule a call Includes: Website Agent, SEO & GEO Agent
Grow	Schedule a call Includes: SEO & GEO Agent, Conversion Agent, Website Agent
Grow Faster	Schedule a call Includes: All 4 agents: SEO & GEO Agent, Paid Ads Agent, Conversion Agent, Website Agent

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Z League Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Z League Rate Limits

0 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Z League

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Z League Finops

FINOPS

Event Specifications 2

AsyncAPI definitions for this provider's event-driven and streaming APIs.

MEGA Public CRM Lead Webhooks

Outbound webhook event surface for the MEGA public CRM Lead API. MEGA POSTs a signed `lead.created` event to a subscriber-registered public HTTPS endpoint whenever a genuine new...

ASYNCAPI

Z League Lead Webhooks

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Z League API Rules

55 rules · 53 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.

Z League Crm Lead Overlay

3 actions · update · z-league-crm-lead-openapi.json

DERIVED

Security Posture 2

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

Z League Authentication

http · 1 scheme

SECURITY

Z League Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Z League Agentic Access

7 operations · 5 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Arazzo

Arazzo

Arazzo

Arazzo

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: z-league
name: Z League
description: 'Z League is an a16z-backed startup that operates the MEGA platform (gomega.ai) — a suite of AI marketing agents
  that autonomously manage SEO, paid advertising, and website/growth optimization for businesses at a fraction of traditional
  agency cost. MEGA also ships a built-in CRM, and exposes the MEGA public CRM Lead API: a server-to-server REST API to pull/search
  leads with cursor pagination, push leads one-at-a-time or in bulk (up to 500) with idempotency and email/phone de-duplication,
  and register HMAC-signed `lead.created` webhooks. Authentication is an admin-issued, customer-locked, scoped Personal Access
  Token (Bearer `mega_...`) plus an `x-customer-id` header. The API is documented with an OpenAPI 3.1 spec and a Mintlify
  developer portal published from the company''s public GitHub org (github.com/zleague).'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://raw.githubusercontent.com/api-evangelist/z-league/refs/heads/main/openapi/z-league-crm-lead-openapi.json
url: https://raw.githubusercontent.com/api-evangelist/z-league/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-operating-name: MEGA (gomega.ai)
x-tier: enriched
x-tier-reason: real-openapi-and-docs
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Company
- CRM
- Leads
- Marketing
- AI Agents
- SEO
- Advertising
- Webhook
- Gaming
tags_raw:
- Company
- CRM
- Leads
- Marketing
- AI Agents
- SEO
- Advertising
- Webhooks
- Gaming
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 25
  pass: local-v1
apis:
- aid: z-league:z-league-leads-api
  name: Z League Leads API
  description: The Leads API from Z League — 2 operation(s) for leads.
  humanURL: https://docs.gomega.ai
  baseURL: https://app.gomega.ai
  tags:
  - Leads
  properties:
  - type: OpenAPI
    url: openapi/z-league-leads-api-openapi.yml
  - type: APIReference
    url: https://docs.gomega.ai
  - type: Documentation
    url: https://docs.gomega.ai
  - type: GettingStarted
    url: https://docs.gomega.ai/quickstart
  - type: Authentication
    url: authentication/z-league-authentication.yml
  - type: Conventions
    url: conventions/z-league-conventions.yml
  - type: Idempotency
    url: conventions/z-league-conventions.yml
  - type: ErrorCatalog
    url: errors/z-league-problem-types.yml
  - type: DataModel
    url: data-model/z-league-data-model.yml
  - type: Conformance
    url: conformance/z-league-conformance.yml
  - type: AsyncAPI
    url: asyncapi/z-league-lead-webhooks-asyncapi.yml
  - type: Webhooks
    url: asyncapi/z-league-lead-webhooks.yml
  - type: AgenticAccess
    url: agentic-access/z-league-agentic-access.yml
- aid: z-league:z-league-webhooks-api
  name: Z League Webhooks API
  description: The Webhooks API from Z League — 2 operation(s) for webhooks.
  humanURL: https://docs.gomega.ai
  baseURL: https://app.gomega.ai
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/z-league-webhooks-api-openapi.yml
  - type: APIReference
    url: https://docs.gomega.ai
  - type: Documentation
    url: https://docs.gomega.ai
  - type: GettingStarted
    url: https://docs.gomega.ai/quickstart
  - type: Authentication
    url: authentication/z-league-authentication.yml
  - type: Conventions
    url: conventions/z-league-conventions.yml
  - type: Idempotency
    url: conventions/z-league-conventions.yml
  - type: ErrorCatalog
    url: errors/z-league-problem-types.yml
  - type: DataModel
    url: data-model/z-league-data-model.yml
  - type: Conformance
    url: conformance/z-league-conformance.yml
  - type: AsyncAPI
    url: asyncapi/z-league-lead-webhooks-asyncapi.yml
  - type: Webhooks
    url: asyncapi/z-league-lead-webhooks.yml
  - type: AgenticAccess
    url: agentic-access/z-league-agentic-access.yml
common:
- type: Plans
  url: plans/z-league-plans-pricing.yml
- type: CapabilityMap
  url: capabilities/z-league-capability-edges.yml
  name: Z League Business Capability Map
- type: X-MCPServerCandidate
  url: mcp/z-league-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Overlay
  url: overlays/z-league-crm-lead-overlay.yaml
- type: DeveloperPortal
  url: https://docs.gomega.ai
- type: Documentation
  url: https://docs.gomega.ai
- type: APIReference
  url: https://docs.gomega.ai
- type: GettingStarted
  url: https://docs.gomega.ai/quickstart
- type: Website
  url: https://www.gomega.ai
- type: Blog
  url: https://www.gomega.ai/blog/
- type: Pricing
  url: https://www.gomega.ai/pricing
- type: SignUp
  url: https://www.gomega.ai/megapricing
- type: Login
  url: https://app.gomega.ai/
- type: TermsOfService
  url: https://www.gomega.ai/legal/terms-of-use
- type: PrivacyPolicy
  url: https://www.gomega.ai/legal/privacy-policy
- type: Support
  url: mailto:support@gomega.ai
- type: GitHubOrganization
  url: https://github.com/zleague
- type: ChangeLog
  url: changelog/z-league-changelog.yml
- type: Lifecycle
  url: lifecycle/z-league-lifecycle.yml
- type: RateLimits
  url: rate-limits/z-league-rate-limits.yml
- type: LLMsTxt
  url: llms/z-league-llms.txt
- type: DomainSecurity
  url: security/z-league-domain-security.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Arazzo
  name: Incremental lead sync
  url: arazzo/z-league-incremental-lead-sync.yml
- type: Arazzo
  name: Capture lead and register webhook
  url: arazzo/z-league-capture-and-notify.yml

Z League API — frequently asked questions

Does Z League have an API?

Yes. APIs.io lists 2 APIs from Z League, including Z League Leads API and Z League Webhooks API.

Is there an OpenAPI specification for the Z League API?

Yes. APIs.io indexes 2 OpenAPI specifications for Z League, each linked for download from this page.

How do I authenticate with the Z League API?

Z League uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Z League Authentication.

How much does the Z League API cost?

Z League publishes its prices; its Starter plan is Schedule a call as of 2026-10-28. APIs.io lists 3 pricing plans for Z League, with each plan's price, limits and inclusions under Pricing on this page.

Is the Z League API ready for AI agents?

Z League has a Kin Score of 48.2 out of 100 (developing) and an Agent Readiness score of 41.0 (agent-native), 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

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.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/z-league"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/z-league/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/z-league/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.