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 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

25.6/100 emerging ▬ flat Agent 0/100 human only Front door AI 5/6 prominent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

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 2026-11-06 · rubric v0.27.0

Composite quality — 25.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 12.1 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 4.1 / 9

Regulatory Posture 3.3 / 15

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

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
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

13 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 16.7 — up to +16.7 composite points
Operational Transparency scores 0.0 — up to +13.0 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/mantle/apis.yml: open an issue on github.com/api-evangelist/mantle 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Private Markets and Fund Administration (ILPA, broker-dealer registration, options market-data vendors)	standard	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Mantle API pricing

Prices published by Mantle, read 2026-10-07 from withmantle.com/equity/pricing.

Plan	Price
Starter	$0 Includes: Unlimited stakeholders, Clerk AI assistant, SAFEs signing + templates, Vesting schedules, Scenario m
Essentials	$1,200/ year Includes: All Starter features, plus concierge onboarding, issue & sign securities, custom SAFE templates, boa
Growth	$3,000/ year Includes: All Essentials features, plus annual 409A valuation, VIP support, SOC 2 Type 2 report access
Growth+ Enterprise	Custom Includes: All Growth features, plus equity administration, ASC 718, QSBS Attestation (US), CCPC (CA)

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Mantle Plans Pricing

4 plans

PLANS

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 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

BlogRSS

BlogRSS

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: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  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: '2026-10-06'
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
- Portfolio-Management
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/mantle-plans-pricing.yml
- url: https://blog.withmantle.com/feed/
  type: BlogRSS
- 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

Mantle API — frequently asked questions

How much does the Mantle API cost?

Mantle publishes its prices; its Starter plan is $0 as of 2026-10-07. APIs.io lists 4 pricing plans for Mantle, with each plan's price, limits and inclusions under Pricing on this page.

Is the Mantle API ready for AI agents?

Mantle has a Kin Score of 25.6 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-06.

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MCP server

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Tools for providers

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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.
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.

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