B2B data intelligence API

One key.
All the data you need.

Stop stitching together Hunter + Clearbit + Apollo. One API call returns company intelligence, contact profiles, email candidates, and growth signals — structured JSON, every time.

100 free creditsNo credit cardRESTful JSONCited sources on every fieldGDPR-safeMCP-ready for AI agents
Get free API key →View API docs
Watch · 30 seconds
See how one API call
replaces three tools.
From company intelligence to email finding to growth signals — watch ApiOne return structured JSON with the sources behind every field.
Plays muted · 30 seconds
Try it live — no signup required
Input — what you send
Company enrichment · 5 credits per call
Output — what you get back
Hit “Run API call” to see the response
Core endpoints, one integration. 11 tools in total.
Company enrichment
Industry, size, HQ, tech stack, business model, value proposition, and growth signals from any domain.
5 credits · 5–9 seconds
Email finder
Returns the most likely address with a confidence score, plus alternatives where they exist.
3 credits · ~2.5 seconds
People enrichment
Title, seniority, department, career stage, and likely skills from a name and company domain.
5 credits · ~1.5 seconds
Email verification
MX record check, mailbox existence, catch-all detection, and disposable address filtering.
1 credit · 1–2 seconds
Signal detection
Hiring velocity, funding events, product launches, and market expansion signals for any company.
3 credits · ~8 seconds
Tech stack detection
Live scan of any domain for CDN, CMS, analytics and ad platforms, with the evidence behind each detection.
4 credits · under 1 second
Built for the agentic era

Beyond enrichment.
The data layer for every workflow.

Three platform extensions that turn a one-shot API into a permanent revenue infrastructure. Each is live, additive, and available today.

C1 — MCP Server
Native MCP Server for AI Agents

All 11 ApiOne tools are exposed as Model Context Protocol (MCP) tools — the standard interface used by LangChain, CrewAI, AutoGPT, and OpenAI function calling. Connect your AI agent to ApiOne in one line. No custom integration code.

LangChainCrewAIAutoGPTOpenAI functionsMCP 2025-06-18 spec
GET /mcp/tools — returns 11 tools
{
  "tools": [
    {
      "name": "apione_company_enrich",
      "description": "Enrich a company domain…",
      "credits_cost": 5
    },
    // + 10 more tools
  ]
}
C2 — CRM Auto-Enrichment
HubSpot Auto-Enrichment

Connect your HubSpot account once. Every new company or contact created in your CRM is automatically enriched with industry, size, tech stack, and growth signals — written back to custom apione_* properties. No manual lookups. No recurring developer work.

HubSpot OAuthAuto-syncs every 15 min5 credits per companySalesforce coming soon
Properties written to HubSpot
apione_industry       → "FinTech"
apione_company_size   → "201-500"
apione_tech_stack     → "Salesforce, HubSpot"
apione_signals        → "Hiring SDRs | Series B"
apione_enriched_at    → "2026-04-28T14:00:00Z"
C3 — Signal Watch
Signal Watch — Webhook Monitoring

Subscribe to any company or contact and receive a webhook the moment a signal fires — funding round, hiring surge, tech stack change, or leadership change. One credit per signal detected. Your endpoint receives an HMAC-signed payload so you can trigger any downstream automation.

Hiring surgeFunding eventTech adoptionLeadership changeHMAC-signed
POST /api/v1/watch — subscribe
{
  "entity_domain": "stripe.com",
  "signal_types":  ["hiring_surge",
                    "funding_event"],
  "webhook_url":   "https://your.app/hook",
  "check_frequency": "daily"
}
Simple pricing
No data, no charge.

If we can't find the company, the person or the email, the call is free. Errors are free too. You only pay for data we actually return.

Free
$0 / month
✓ 100 credits
✓ All endpoints
✓ 30 calls / min
– No SLA
Starter
$49 / month
✓ 5,000 credits
✓ All endpoints
✓ 60 calls / min
✓ Email support
Growth most popular
$149 / month
✓ 25,000 credits
✓ Async batch (10 at once)
✓ Cache hits free (50ms)
✓ Priority support
Scale
$499 / month
✓ 100,000 credits
✓ SLA guarantee
✓ Dedicated support
✓ Custom rate limits

1 credit = 1 API operation. Company enrichment = 5 credits. Email find = 3 credits. Email verify = 1 credit.

Security

Your keys stay yours.
We return data, not instructions.

API ONE never stores your queries in a way that can be traced back to you. Every key is hashed with SHA-256 before storage. All traffic is TLS 1.3. We are GDPR-compliant by architecture, not by checkbox.

SHA-256 key hashing
Your API key is hashed on receipt. The plaintext is never stored.
TLS 1.3 everywhere
All API traffic is encrypted in transit. No exceptions.
No query logging
We log credit usage and status codes — not the content of your queries.
GDPR by design
Data minimisation, right to erasure, and DPA available on request.
SHA-256 key hashing
TLS 1.3
No query logs
GDPR compliant
DPA available
API reference
MethodEndpointDescriptionCreditsKey params
POST/v1/companyEnrich a company by domain5 creditsdomain
POST/v1/email/findFind email candidates for a person3 creditsfirst_name, last_name, domain
POST/v1/email/verifyVerify deliverability of an email1 creditemail
POST/v1/peopleEnrich a person by name + domain5 creditsname, domain
POST/v1/signalsGet growth signals for a company3 creditsdomain
POST/v1/techstackDetect technology stack of a company4 creditsdomain
Full API docs →Authentication guide →

Start enriching in minutes.

Free account · 100 credits · No credit card required

Create free account →Read the docs
✓ GDPR compliant by design✓ No spam. No cold list building.✓ Lawful business use only