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, Ai, 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

17.7/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyAiCap TableEquity ManagementPortfolio ManagementAlternative AssetsFintechSaaS409A Valuation

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 17.7/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 3.0 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

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
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: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- 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