Every API 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 apis
7 MCP tools reach this
find_apisBrowse and filter every API in the catalog.get_api_artifactsOne API's artifacts, grouped by type.get_openapiThe primary OpenAPI for this API.find_similar_apisAPIs that look like this one.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 API
curl "https://apis.io/api/v1/apis/caplight-funding-rounds-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"
Discovery needs no key. Ratings and market analysis are Pro.
Get an API key
Free tier, no email required.
A second provider on the same verified email joins the account you already have.
openapi: 3.2.0
info:
version: 2.0.0
title: Caplight REST Funding Rounds API
description: 'This page provides documentation for the Caplight API, a paid add-on product of [Caplight Data](https://www.data.caplight.com). To request API access, please contact us at contact@caplight.com.
# Production server
https://us-central1-caplight-prod.cloudfunctions.net/api/public
# Staging/sandbox server
https://us-central1-caplight-staging.cloudfunctions.net/api/public
# API versions
Endpoints are versioned via path prefix: `/v1/` for company, market price, and order book; `/v2/` for company lookup, funding rounds, investors, company details, and comps.
# Company IDs
Companies have two ID formats: a **v1 company ID** (used in v1 endpoints) and a **v2 company ID** (used in v2 endpoints). Both v1 and v2 company responses include both in `caplightIds` for cross-referencing. Path params that accept company identifiers support either format, plus PitchBook ID and company domain where applicable.
If you have a domain, a v1 company ID or a PitchBook ID and need the v2 company ID, call `GET /v2/companies` — it resolves up to 50 identifiers per request and covers companies added recently.
# V2 Access & Permissions
**Company access:** v2 company-scoped endpoints (funding rounds, investors, company details, and comps) enforce per-account access control. Your account may have (1) a whitelist of permitted companies, (2) an annual limit on distinct companies you can access, or both. Accessing the same company multiple times counts once toward the limit. The `/funding-rounds/updates` endpoint returns only rounds for companies you have access to.
**Restricted fields:** Some accounts have field-level restrictions. When a field is restricted, it is omitted from the response and its name appears in `restricted.fields` on the funding round object. Restricted fields may include: `amounts`, `valuation`, `pps`, `participants`, `citations`. Check for a `restricted` object and handle omitted fields in your integration.
# Widget Embed
In addition to this API, Caplight also provides an embeddable widget for customers who would like an easy way of integrating Caplight Data into their platform. [See example](https://storage.googleapis.com/caplight-prod.appspot.com/images/embed-example-3.png). For inquiries, please contact us directly.
# Authentication
<SecurityDefinitions />
'
termsOfService: https://platform.caplight.com/terms
contact:
name: 'Contact: Caplight Engineering'
email: engineering@caplight.com
x-logo:
url: https://storage.googleapis.com/caplight-prod.appspot.com/caplight-logos/api-logo.png
altText: Caplight logo
servers:
- url: //us-central1-caplight-prod.cloudfunctions.net/api/public
description: Production
- url: //us-central1-caplight-staging.cloudfunctions.net/api/public
description: Staging/Sandbox
tags:
- name: Funding Rounds
description: Funding round data including amounts, valuations, participants, and citations
paths:
/v2/companies/{companyId}/funding-rounds:
get:
tags:
- Funding Rounds
summary: Get company funding rounds
description: Returns a paginated, sortable list of funding rounds for a company. Results are sorted by `roundDate` ascending by default.
parameters:
- name: companyId
in: path
description: 'Company identifier: v2 company ID, v1 company ID, PitchBook ID (e.g. 41339-53), or company domain (e.g. clickhouse.com). A domain can match more than one company, in which case the best match is used; call `GET /v2/companies` to see every candidate. Access control and the annual distinct-company limit apply the same way however the company is identified.'
required: true
schema:
type: string
- name: pageNumber
in: query
description: Page number (1-based). First page is 1.
required: false
schema:
type: integer
default: 1
example: 1
- name: pageSize
in: query
description: Number of results per page (default 50, max 200)
required: false
schema:
type: integer
default: 50
minimum: 1
maximum: 200
example: 50
- name: sortBy
in: query
description: 'Field to sort results by. `roundDate` sorts by the best available date for the round, using the first non-null value from: completedAt, the round''s internal date, then announcedAt. `updatedAt` sorts by the last update timestamp. Rounds with a null sort value are placed at the end regardless of sort order.'
required: false
schema:
type: string
enum:
- roundDate
- updatedAt
default: roundDate
example: roundDate
- name: sortOrder
in: query
description: 'Sort direction: `asc` for ascending (oldest first), `desc` for descending (newest first).'
required: false
schema:
type: string
enum:
- asc
- desc
default: asc
example: asc
responses:
'200':
description: Successful operation
content:
application/json:
schema:
$ref: '#/components/schemas/FundingRoundsResponse'
example:
fundingRounds:
- id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
company:
id: b2c3d4e5-f6a7-8901-bcde-f12345678901
name: Acme Inc
domain: acme.com
pitchbookId: 41339-53
caplightIds:
v2Id: b2c3d4e5-f6a7-8901-bcde-f12345678901
v1Id: abc123xyz
status: completed
isDeleted: false
announcedAt: '2024-03-15'
completedAt: '2024-06-01'
roundName: Series B
amounts:
total:
amount: 50000000
currency: USD
amountUsd: 50000000
equity:
amount: 50000000
currency: USD
amountUsd: 50000000
debt:
amount: null
currency: USD
amountUsd: null
valuation:
preMoney:
amount: 200000000
currency: USD
amountUsd: 200000000
postMoney:
amount: 250000000
currency: USD
amountUsd: 250000000
pps:
amount: 12.5
currency: USD
amountUsd: 12.5
participants:
- id: f1a2b3c4-d5e6-7890-abcd-111111111111
investor:
id: 11111111-aaaa-bbbb-cccc-111111111111
type: firm
name: Sequoia Capital
role: lead
- id: f1a2b3c4-d5e6-7890-abcd-222222222222
investor:
id: 22222222-aaaa-bbbb-cccc-222222222222
type: firm
name: a16z
role: participant
citations:
- id: c1a2b3c4-d5e6-7890-abcd-333333333333
type: press_release
url: https://example.com/press
sourceName: Company Blog
publishedAt: '2024-06-01'
updatedAt: '2024-06-15T14:30:00.000Z'
- id: d4e5f6a7-b8c9-0123-def0-456789abcdef
company:
id: e5f6a7b8-c9d0-1234-ef01-56789abcdef0
name: Beta Corp
domain: betacorp.io
pitchbookId: null
caplightIds:
v2Id: e5f6a7b8-c9d0-1234-ef01-56789abcdef0
v1Id: null
status: announced
isDeleted: false
announcedAt: '2024-07-01'
completedAt: null
roundName: Series C
restricted:
fields:
- amounts
- valuation
- participants
updatedAt: '2024-07-05T11:00:00.000Z'
pagination:
pageNumber: 1
numPages: 3
totalRecords: 12
/v2/funding-rounds/updates:
get:
tags:
- Funding Rounds
summary: Get funding round updates
description: 'Returns funding rounds that have been updated within a date range. Use this for sync/incremental ingestion. Only returns rounds for companies your account has access to.
**Window:** Rounds are returned where `updatedSince < updated_at <= upTo` (updatedSince is exclusive, upTo is inclusive).
**Ordering:** Results are ordered by `updated_at` ascending, then `id` ascending.
**Pagination:** For the first request, omit `upTo` or set it to bound your query. The response includes an `upTo` value. For pages 2 through N of the same batch, pass that same `upTo` as the `upTo` query param so pagination stays consistent.
**Checkpointing:** After fetching all pages for a batch, advance your checkpoint by setting the next request''s `updatedSince` to the `upTo` value from the previous response.
**Deleted rounds:** Rounds deleted within the query range are included with `isDeleted: true`.'
parameters:
- name: updatedSince
in: query
description: ISO 8601 date — exclusive lower bound. Return rounds with updated_at strictly after this time. Use the previous response's upTo to checkpoint for the next batch.
required: true
schema:
type: string
format: date-time
example: '2024-01-01T00:00:00.000Z'
- name: upTo
in: query
description: ISO 8601 date — inclusive upper bound. Return rounds with updated_at <= this time. Omit for first request (defaults to now). For pages 2..N, reuse the upTo value from the first page response.
required: false
schema:
type: string
format: date-time
- name: pageNumber
in: query
description: Page number (1-based). First page is 1.
required: false
schema:
type: integer
default: 1
example: 1
- name: pageSize
in: query
description: Number of results per page (default 50, max 200)
required: false
schema:
type: integer
default: 50
minimum: 1
maximum: 200
example: 50
responses:
'200':
description: Successful operation
content:
application/json:
schema:
$ref: '#/components/schemas/FundingRoundUpdatesResponse'
example:
updatedSince: '2024-06-01T00:00:00.000Z'
upTo: '2024-06-15T23:59:59.999Z'
fundingRounds:
- id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
company:
id: b2c3d4e5-f6a7-8901-bcde-f12345678901
name: Acme Inc
domain: acme.com
pitchbookId: 41339-53
caplightIds:
v2Id: b2c3d4e5-f6a7-8901-bcde-f12345678901
v1Id: abc123xyz
status: completed
isDeleted: false
announcedAt: '2024-03-15'
completedAt: '2024-06-01'
roundName: Series B
amounts:
total:
amount: 50000000
currency: USD
amountUsd: 50000000
equity:
amount: 50000000
currency: USD
amountUsd: 50000000
debt:
amount: null
currency: USD
amountUsd: null
valuation:
preMoney:
amount: 200000000
currency: USD
amountUsd: 200000000
postMoney:
amount: 250000000
currency: USD
amountUsd: 250000000
pps:
amount: 12.5
currency: USD
amountUsd: 12.5
participants:
- id: f1a2b3c4-d5e6-7890-abcd-111111111111
investor:
id: 11111111-aaaa-bbbb-cccc-111111111111
type: firm
name: Sequoia Capital
role: lead
citations: []
updatedAt: '2024-06-10T09:00:00.000Z'
pagination:
pageNumber: 1
numPages: 1
totalRecords: 1
'400':
description: Invalid date parameters (e.g. missing or invalid updatedSince)
/v2/funding-rounds/{roundId}:
get:
tags:
- Funding Rounds
summary: Get funding round by ID
description: Returns a single funding round by its round ID. Returns 404 if the round is not accessible to your account.
parameters:
- name: roundId
in: path
description: Round ID
required: true
schema:
type: string
format: uuid
responses:
'200':
description: Successful operation
content:
application/json:
schema:
$ref: '#/components/schemas/FundingRoundSnapshot'
example:
id: a1b2c3d4-e5f6-7890-abcd-ef1234567890
company:
id: b2c3d4e5-f6a7-8901-bcde-f12345678901
name: Acme Inc
domain: acme.com
pitchbookId: 41339-53
caplightIds:
v2Id: b2c3d4e5-f6a7-8901-bcde-f12345678901
v1Id: abc123xyz
status: completed
isDeleted: false
announcedAt: '2024-03-15'
completedAt: '2024-06-01'
roundName: Series B
amounts:
total:
amount: 50000000
currency: USD
amountUsd: 50000000
equity:
amount: 50000000
currency: USD
amountUsd: 50000000
debt:
amount: null
currency: USD
amountUsd: null
valuation:
preMoney:
amount: 200000000
currency: USD
amountUsd: 200000000
postMoney:
amount: 250000000
currency: USD
amountUsd: 250000000
pps:
amount: 12.5
currency: USD
amountUsd: 12.5
participants:
- id: f1a2b3c4-d5e6-7890-abcd-111111111111
investor:
id: 11111111-aaaa-bbbb-cccc-111111111111
type: firm
name: Sequoia Capital
role: lead
- id: f1a2b3c4-d5e6-7890-abcd-222222222222
investor:
id: 22222222-aaaa-bbbb-cccc-222222222222
type: firm
name: Andreessen Horowitz
role: participant
- id: f1a2b3c4-d5e6-7890-abcd-444444444444
investor:
id: 44444444-aaaa-bbbb-cccc-444444444444
type: individual
name: Jane Smith
role: participant
citations:
- id: c1a2b3c4-d5e6-7890-abcd-555555555555
type: press_release
url: https://acme.com/series-b
sourceName: Acme Blog
publishedAt: '2024-06-01'
- id: c1a2b3c4-d5e6-7890-abcd-666666666666
type: sec_filing
url: null
sourceName: Form D
publishedAt: '2024-06-15'
updatedAt: '2024-06-15T14:30:00.000Z'
'404':
description: Funding round not found or not accessible
components:
schemas:
FundingRoundsResponse:
type: object
properties:
fundingRounds:
type: array
items:
$ref: '#/components/schemas/FundingRoundSnapshot'
pagination:
$ref: '#/components/schemas/Pagination'
FundingRoundUpdatesResponse:
type: object
properties:
updatedSince:
type: string
description: Exclusive lower bound used for this query
upTo:
type: string
description: Inclusive upper bound used for this query. Reuse this value as up_to when fetching pages 2..N; use as updated_since for the next batch after completing all pages.
fundingRounds:
type: array
items:
$ref: '#/components/schemas/FundingRoundSnapshot'
pagination:
$ref: '#/components/schemas/Pagination'
ApiRestrictedFields:
type: object
description: Present when one or more fields are omitted due to account field-level restrictions. The fields array lists omitted field names (e.g. amounts, valuation, pps, participants, citations). Always check for this object and handle missing fields in your integration.
properties:
fields:
type: array
items:
type: string
description: Names of fields omitted from the response due to account permissions
MoneyAmount:
type: object
description: A monetary value with original currency and USD equivalent
properties:
amount:
type: number
nullable: true
description: Amount in the original currency
currency:
type: string
description: ISO 4217 currency code (e.g. USD, EUR)
amountUsd:
type: number
nullable: true
description: Amount converted to USD
Pagination:
type: object
properties:
pageNumber:
type: integer
description: Page number (1-based). First page is 1.
example: 1
numPages:
type: integer
description: Total number of pages for the result set
example: 10
totalRecords:
type: integer
description: Total number of records for the result set
example: 250
FundingRoundSnapshot:
type: object
description: Funding round with amounts, valuation, participants, and citations
properties:
id:
type: string
description: Round ID
company:
$ref: '#/components/schemas/PublicCompanySummary'
status:
type: string
enum:
- announced
- completed
- cancelled
- rumored
- postponed
isDeleted:
type: boolean
description: Soft-deleted flag
announcedAt:
type: string
nullable: true
description: Announcement date (YYYY-MM-DD)
completedAt:
type: string
nullable: true
description: Completion date (YYYY-MM-DD)
roundName:
type: string
description: Round name as recorded, e.g. "Series C" or "Debt"
amounts:
type: object
description: Funding amounts broken down by total, equity, and debt
properties:
total:
$ref: '#/components/schemas/MoneyAmount'
description: Total funding amount
equity:
$ref: '#/components/schemas/MoneyAmount'
description: Equity component
debt:
$ref: '#/components/schemas/MoneyAmount'
description: Debt component
valuation:
type: object
description: Round valuation
properties:
preMoney:
$ref: '#/components/schemas/MoneyAmount'
description: Pre-money valuation
postMoney:
$ref: '#/components/schemas/MoneyAmount'
description: Post-money valuation
pps:
$ref: '#/components/schemas/MoneyAmount'
description: Average price per share
participants:
type: array
items:
$ref: '#/components/schemas/FundingRoundParticipant'
citations:
type: array
items:
$ref: '#/components/schemas/FundingRoundCitation'
restricted:
$ref: '#/components/schemas/ApiRestrictedFields'
updatedAt:
type: string
format: date-time
description: Last update timestamp
FundingRoundCitation:
type: object
properties:
id:
type: string
type:
type: string
enum:
- url
- coi
- press_release
- sec_filing
- news
- other
url:
type: string
nullable: true
sourceName:
type: string
nullable: true
publishedAt:
type: string
nullable: true
PublicInvestorSummary:
type: object
properties:
id:
type: string
description: Investor ID
type:
type: string
enum:
- firm
- individual
name:
type: string
description: Investor display name
PublicCompanySummary:
type: object
description: Company summary. Companies have two IDs — v1 and v2 — both provided in caplightIds for cross-referencing across API versions.
properties:
id:
type: string
description: v2 company ID
name:
type: string
description: Company name
domain:
type: string
nullable: true
description: Company website domain
pitchbookId:
type: string
nullable: true
description: Pitchbook company ID
caplightIds:
type: object
description: Both company ID formats for cross-referencing v1 and v2 endpoints
properties:
v2Id:
type: string
description: v2 company ID (same as id)
v1Id:
type: string
nullable: true
description: v1 company ID (for v1 API endpoints)
FundingRoundParticipant:
type: object
properties:
id:
type: string
description: Participation record ID
investor:
$ref: '#/components/schemas/PublicInvestorSummary'
role:
type: string
enum:
- lead
- participant
- unknown
description: Investor role in the round
securitySchemes:
api_key:
description: Caplight API authentication is managed through an api_key header value. Please contact us if you do not yet have an API key.
type: apiKey
name: api_key
in: header
x-tagGroups:
- name: V1
tags:
- Company
- Companies
- MarketPrice
- Live Orderbook
- Trade History
- Order History
- Company Filings
- Stock Splits
- Fund Marks
- News
- company_model
- order_model
- market_price_model
- trade_model
- 409a_valuation_model
- fund_mark_model
- comp_model
- stock_split_model
- coi_model
- name: V2
tags:
- Funding Rounds
- Investors
- Company Lookup
- Company Details
- Comps