Ambolt funding rounds API

openapi: 3.2.0
info:
  title: Ambolt data tools funding rounds API
  version: 0.1.1
  description: Pay-per-call data endpoints using the x402 protocol (USDC on Base, Polygon and Solana). Failed calls are not charged.
  x-guidance: 'Call GET /v1/<tool> with the documented query parameters. Without payment the response is 402 with the price and payment requirements; an x402 client pays in USDC and retries. Add free=1 for one free call per tool and IP per day. Company, tender, document, rates, on-chain and web tools; every response carries source and date. The same tools are available as MCP tools at /mcp (free, 30 requests a minute) and as Apify Actors. Company-level data only: no personal data.'
  contact:
    email: hello@ambolt.dev
    url: https://ambolt.dev
servers:
- url: https://api.ambolt.dev
security: []
tags:
- name: funding rounds
paths:
  /v1/funding-rounds-form-d:
    get:
      operationId: funding_rounds_form_d
      summary: 'Startup Funding Rounds Search: SEC Form D, Official Data'
      description: 'Find recent startup funding rounds from official SEC Form D filings (Regulation D private placements): company, state, industry group, offering amount, amount sold, first sale date, investor count and the filing link. Filter by date, industry, state and size; funds are excluded by default. Company-level only: no officers, directors or other persons are returned.'
      tags:
      - funding rounds
      parameters:
      - name: since
        in: query
        required: false
        schema:
          type: string
          pattern: ^\d{4}-\d{2}-\d{2}$
          description: 'First filing date (YYYY-MM-DD). Default: 7 days ago. Use the date of your last run for new rounds only.'
        description: 'First filing date (YYYY-MM-DD). Default: 7 days ago. Use the date of your last run for new rounds only.'
      - name: until
        in: query
        required: false
        schema:
          type: string
          pattern: ^\d{4}-\d{2}-\d{2}$
          description: 'Last filing date (YYYY-MM-DD). Default: today. At most 14 days after since.'
        description: 'Last filing date (YYYY-MM-DD). Default: today. At most 14 days after since.'
      - name: industries
        in: query
        required: false
        schema:
          type: array
          maxItems: 10
          items:
            type: string
            maxLength: 60
          description: 'Keep filings whose Form D industry group contains one of these words (for example Technology, Biotechnology, Computers, Health). Default: all except funds.'
        description: 'Keep filings whose Form D industry group contains one of these words (for example Technology, Biotechnology, Computers, Health). Default: all except funds.'
      - name: states
        in: query
        required: false
        schema:
          type: array
          maxItems: 20
          items:
            type: string
            pattern: ^[A-Za-z]{2}$
          description: Issuer state or country codes (for example CA, NY, TX).
        description: Issuer state or country codes (for example CA, NY, TX).
      - name: minAmountUsd
        in: query
        required: false
        schema:
          type: integer
          minimum: 0
          description: Minimum total offering amount in USD.
        description: Minimum total offering amount in USD.
      - name: includeFunds
        in: query
        required: false
        schema:
          type: boolean
          default: false
          description: Also return pooled investment funds, REITs and similar vehicles (excluded by default).
        description: Also return pooled investment funds, REITs and similar vehicles (excluded by default).
      - name: includeAmendments
        in: query
        required: false
        schema:
          type: boolean
          default: false
          description: 'Also return Form D/A amendments (default: new filings only).'
        description: 'Also return Form D/A amendments (default: new filings only).'
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          minimum: 1
          maximum: 500
          default: 25
          description: Maximum rounds returned. Each returned round is one billable result.
        description: Maximum rounds returned. Each returned round is one billable result.
      - name: maxSeconds
        in: query
        required: false
        schema:
          type: integer
          minimum: 5
          maximum: 800
          default: 25
          description: Time budget for reading filings. A weekly scheduled run over many filings should use 300 or more; the result says whether every filing in range was read (complete) and gives nextSince for the next run.
        description: Time budget for reading filings. A weekly scheduled run over many filings should use 300 or more; the result says whether every filing in range was read (complete) and gives nextSince for the next run.
      - name: free
        in: query
        required: false
        schema:
          type: string
          enum:
          - '1'
        description: Set to 1 for one free call per tool and IP address per day (no payment).
      x-payment-info:
        price:
          mode: fixed
          currency: USD
          amount: '0.050000'
        protocols:
        - x402: {}
      responses:
        '200':
          description: Result (JSON). Every result names its source and the time it was read.
          content:
            application/json:
              schema:
                type: object
        '400':
          description: Invalid input; not charged.
        '402':
          description: 'Payment required: 0.05 USD in USDC (x402 v2).'