Firmbase

    One API for UK company data and AI research

    Query a clean Companies House spine for the companies you want. Run AI agents to research anything about them, with evidence and sources. Pay only for what you use.

    firmbase-api · v1
    POST/v1/companies/search
    Data spine
    { "sector": "fintech", "employees": { "min": 10 } }
    → 25 companies
    POST/v1/companies/{id}/research
    AI agent
    Evidence resolved0.92 conf.

    source: northbridge.example.com/trust
    → typed, sourced
    POST/v1/companies/{id}/enrich
    Enrichment
    technographicsdirectorswork_emailheadcountfilingsbilled on resolved cells
    REST · JSON
    UK Companies House spine
    operational

    Custom research, on any criteria you can describe

    Define what you want to know in plain language. The agents do the digging, read the evidence, and return a structured answer with sources. No fixed schema, no preset fields: if a person could find it on the public web, you can research it at scale.

    ?Do they sell into the NHS?
    ?Are they actively hiring sales staff right now?
    ?Have they raised external funding in the last 12 months?
    ?Do they mention SOC 2 or ISO 27001 compliance?
    Every answer comes back typed, scored, and evidenced.
    REQUESTPOST /v1/companies/fb_8f2a1c/research
    {
  "criteria": [
    {
      "key": "has_soc2_certification",
      "question": "Does this company hold a current SOC 2 certification, or another recognised data security certification such as ISO 27001?"
    }
  ]
}
    RESPONSE
    {
  "company_id": "fb_8f2a1c",
  "results": [
    {
      "key": "has_soc2_certification",
      "value": true,
      "confidence": 0.92,
      "evidence": "Trust page lists SOC 2 Type II (2024) and ISO 27001 certification. Audited by Prescient Assurance.",
      "sources": [
        "https://northbridge.example.com/trust",
        "https://northbridge.example.com/security"
      ]
    }
  ],
  "usage": { "companies": 1, "criteria": 1, "billable_units": 1 }
}
    No black box

    The agents research the open web, the same sources your team would check. They do not rely on hidden proprietary data. You see the evidence and the source URL behind every answer, so you can trust it or verify it yourself.

    Build your universe. Then research it.

    Filter the UK company database by sector, size, and financials to define exactly the set of companies you want. Then run research agents across that universe, and enrich only the cells you need. Pay only for cells that resolve.

    Select your companies, then complete the records.
    REQUESTPOST /v1/companies/search
    {
  "filters": {
    "sic_sectors": ["software_development"],
    "employee_estimate": { "min": 10, "max": 50 }
  },
  "limit": 25
}
    REQUESTPOST /v1/companies/fb_8f2a1c/enrich
    {
  "columns": ["technographics", "directors", "work_email"]
}
    RESPONSE
    {
  "company_id": "fb_8f2a1c",
  "enrichment": {
    "technographics": { "status": "resolved", "stack": ["HubSpot", "AWS", "Stripe"] },
    "directors":      { "status": "resolved", "count": 3 },
    "work_email":     { "status": "unresolved", "reason": "no_verified_match" }
  },
  "billing": { "resolved_columns": 2, "note": "Unresolved columns are not billed." }
}

    Built for GTM Engineers

    ✓

    Clean UK spine

    Built on Companies House, kept current, with sector tags from real websites, not stale SIC codes.

    ✓

    Research at scale

    Run one question across one company or fifty thousand. Work that takes an analyst days happens in minutes.

    ✓

    Evidenced, not guessed

    Every answer carries a confidence score and the source URLs behind it.

    ✓

    Your criteria, not ours

    Research anything you can describe in a sentence. No fixed fields, no preset schema.

    Flat platform access. Metered consumption.

    Platform access · included

    Base UK firmographic data

    • Base UK firmographic data
    • Search and filter endpoints
    • Company records and history
    • Generous rate limits
    Consumption · metered

    Pay only for resolved work

    • Research agent runs, priced per company, per criterion
    • Enrichment columns: technographics, directors, verified email
    • Billed only on resolved cells
    • Volume pricing on request

    Pricing depends on volume and use case. Get in touch and we will scope it with you.

    FAQ