Mantle

Mantle is an AI-powered data platform for alternative assets management, positioning itself as "alternative assets data, structured for the agentic era." It offers two products: Mantle Equity, a cap table management platform for founders and CFOs covering fundraising, SAFEs, stock options, 409A valuations, and QSBS attestation; and Mantle Portal, a portfolio management and insights product for institutional investors such as endowments and family offices. Mantle converts fragmented documents into structured, trustworthy data and layers AI workflows on top. The company is SOC 2 Type II compliant and is backed by Sierra Ventures. As of this enrichment pass no public developer API or API documentation was found; the product is delivered as a hosted SaaS application with an end-user help center.

Mantle is profiled on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Cap Table, Equity Management, and Portfolio-Management.

Mantle’s developer surface includes documentation, engineering blog, pricing, support, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub

18.4/100 emerging ▬ flat Agent 0/100 human only saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Artificial Intelligence Cap Table Equity Management Portfolio-Management Alternative Assets Fintech Software-as-a-Service409A Valuation

Kin Score

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

Composite quality — 18.4/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 3.3 / 20

Access Clarity 7.9 / 20

Operational Transparency 0.0 / 13

Contract Governance 2.2 / 12

Discoverability 5.0 / 10

Agent readiness — 0/100 · 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 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

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/mantle: 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 →

Security Posture 1

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

Mantle Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 2

Authentication, authorization, and security posture

Compliance

Compliance

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: mantle
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: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/mantle.png
name: Mantle
description: 'Mantle is an AI-powered data platform for alternative assets management, positioning itself as "alternative
  assets data, structured for the agentic era." It offers two products: Mantle Equity, a cap table management platform for
  founders and CFOs covering fundraising, SAFEs, stock options, 409A valuations, and QSBS attestation; and Mantle Portal,
  a portfolio management and insights product for institutional investors such as endowments and family offices. Mantle converts
  fragmented documents into structured, trustworthy data and layers AI workflows on top. The company is SOC 2 Type II compliant
  and is backed by Sierra Ventures. As of this enrichment pass no public developer API or API documentation was found; the
  product is delivered as a hosted SaaS application with an end-user help center.'
url: https://raw.githubusercontent.com/api-evangelist/mantle/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- sierra-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Artificial Intelligence
- Cap Table
- Equity Management
- Portfolio-Management
- Alternative Assets
- Fintech
- Software-as-a-Service
- 409A Valuation
tags_raw:
- Company
- Ai
- Cap Table
- Equity Management
- Portfolio Management
- Alternative Assets
- Fintech
- SaaS
- 409A Valuation
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://withmantle.com/
- type: Documentation
  url: https://withmantle.com/help
- type: Blog
  url: https://blog.withmantle.com/
- type: Pricing
  url: https://withmantle.com/equity/pricing
- type: Support
  url: https://withmantle.com/contact
- type: TermsOfService
  url: https://withmantle.com/resources/terms-of-use
- type: PrivacyPolicy
  url: https://withmantle.com/resources/privacy-policy
- type: Compliance
  url: https://withmantle.com/security
- type: Conformance
  url: conformance/mantle-conformance.yml
- type: DomainSecurity
  url: security/mantle-domain-security.yml
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 3
  pass: local-v1

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