Caplight
Caplight Technologies is a San Francisco private-markets data and trading platform for institutional investors, covering 50,000+ VC-backed private companies with secondary-market pricing, a live institutional order book, trade and order history, funding rounds with valuations and participants, investor participation, SEC-derived fund marks, COI filings, stock splits, news, company signals and comparable-company indices. Its proprietary MarketPrice(TM) estimate is implied from live bids, asks and closed secondary trades. Caplight exposes the dataset through a versioned REST API (v1 and v2, api_key header auth, documented with a public OpenAPI 3.1.0 definition rendered in Redoc), a hosted OAuth-protected MCP server for Claude, and a one-line embeddable widget. Securities are offered through Caplight Markets LLC, member FINRA/SIPC.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Caplight the way a machine reads it — 39 machine-readable artifacts across 17 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Caplight scores 46.2/100 (developing), with a separate agent-readiness read of 53/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
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How we profile Caplight
Each block below is one kind of artifact we hold for Caplight. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 17
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Caplight MCP Server
Hosted, remote MCP server that connects Claude.ai and Claude Desktop to the Caplight dataset. Caplight documents 15 tools spanning live MarketPrice quotes and price history, the...
Caplight Companies API
The Companies API from Caplight — 1 operation(s) for companies.
Caplight Company API
The Company API from Caplight — 3 operation(s) for company.
Caplight Company Details API
Canonical Company resource: identity (name, legal name, location), descriptions, and the latest LLM-generated firmographic tags (sectors / verticals / keywords with attribution).
Caplight Company Filings API
COI (Certificate of Incorporation) filings and related company documents
Caplight Company Lookup API
Resolves company domains, PitchBook IDs and v1 company IDs to v2 company IDs, in batches.
Caplight Composite Index API
The Composite Index API from Caplight — 3 operation(s) for composite index.
Caplight Comps API
LLM-discovered comparable companies with an overall similarity score, a per-dimension breakdown, a classification, and a short rationale.
Caplight Fund Marks API
Mutual fund mark-to-market valuations from SEC filings
Caplight Funding Rounds API
Funding round data including amounts, valuations, participants, and citations
Caplight Investors API
Investor participation data for companies
Caplight Live Orderbook API
The Live Orderbook API from Caplight — 1 operation(s) for live orderbook.
Caplight Market Price API
Caplight's proprietary MarketPrice estimate, calculated using executed trades, company primary rounds, bids/offers, fund marks, 409a valuations, and comps performance.
Caplight News API
Company news articles with sentiment analysis
Caplight Order History API
The Order History API from Caplight — 1 operation(s) for order history.
Caplight Stock Splits API
The Stock Splits API from Caplight — 1 operation(s) for stock splits.
Caplight Trade History API
The Trade History API from Caplight — 1 operation(s) for trade history.
Scroll within the panel for all 17 ·
Open Collections 17
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONCaplight REST Companies API
OPEN COLLECTIONCaplight REST Company API
OPEN COLLECTIONCaplight REST Company Details API
OPEN COLLECTIONCaplight REST Company Filings API
OPEN COLLECTIONCaplight REST Company Lookup API
OPEN COLLECTIONCaplight REST Composite Index API
OPEN COLLECTIONCaplight REST Comps API
OPEN COLLECTIONCaplight REST Fund Marks API
OPEN COLLECTIONCaplight REST Funding Rounds API
OPEN COLLECTIONCaplight REST Investors API
OPEN COLLECTIONCaplight REST Live Orderbook API
OPEN COLLECTIONCaplight REST Market Price API
OPEN COLLECTIONCaplight REST News API
OPEN COLLECTIONCaplight REST Order History API
OPEN COLLECTIONCaplight REST Stock Splits API
OPEN COLLECTIONCaplight REST Trade History API
OPEN COLLECTIONScroll within the panel for all 17 ·
MCP Servers 2
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
caplight-mcp.yml
MCP SERVERmcp
MCP SERVERSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Caplight — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 5
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/caplight · machine-readable index on apis.io
This is an independent, third-party profile of Caplight, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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