Last updated: 2026-08-13
Signalbase is a GTM signal API that detects funding, acquisition, hiring, and job-change events across the web, verifying each one against an 80 percent accuracy threshold before it is listed. Every signal type is exposed as an MCP tool that Claude, Cursor, and Windsurf can call directly.
About Signalbase
Signalbase is a go-to-market signals platform built by Signalbase B.V., a company headquartered in Amsterdam, Netherlands. It solves a specific problem for sales and RevOps teams: static contact databases go stale the moment a company raises funding, hires a new VP, or gets acquired, so outreach lands on outdated information. Signalbase instead tracks more than 960,000 role changes alongside funding, acquisition, and hiring events as they happen across the web. The platform runs every raw event through a Detect, Verify, and Normalize pipeline, requiring an 80 percent accuracy threshold before a signal is listed, with the original source attached for verification. Data reaches customers through a v2 REST API with Bearer token authentication, webhooks for streaming into a CRM or data warehouse, or a Model Context Protocol (MCP) server that exposes every endpoint as a callable tool for Claude, Cursor, and Windsurf. Unlike a raw exported database, each result carries source attribution rather than unverified scraped text. Signalbase fits GTM and RevOps managers building trigger-based outbound, data engineers keeping a warehouse or CRM synced with fresh company data, and teams building AI SDR or agent workflows that need a live signals feed rather than a static list. Recruiting agencies use the job-change and hiring signals to track executive moves. Vendors named as users on the Signalbase site include HubSpot, Datadog, and Plaid. Pricing follows a credit model: a mid-tier monthly plan sized for individual GTM and RevOps teams, and a custom, usage-based plan for platforms and agencies that want to redistribute Signalbase data with an SLA and priority support attached. Exact tier pricing appears in the FAQ below. Signalbase is delivered entirely through its web dashboard and API, with no desktop or mobile app. Signalbase's MCP server connects directly to AI agents, letting Claude, Cursor, and Windsurf query funding, acquisition, hiring, and job-change data without custom integration code. The company also publishes a public GitHub organization with an MCP client, Agent Skills packages, and an industry-codes reference dataset.
Pricing
Pro plan: EUR 200/month for 2,000 credits (1 credit = 1 signal or MCP tool call). Data Partner (redistribution/high-volume): custom pricing starting at EUR 3,000/month with SLA and priority support. Free 7-day trial with 500 credits; no persistent free tier.
Key Features
- Funding Signals: Flags new funding rounds with round type, amount, and investor names attached, sourced continuously and delivered with the original citation link.
- Job Change and Hiring Signals: Tracks executive job changes and hiring patterns across more than 960,000 recorded role changes, filterable by department and seniority.
- Acquisition Signals: Scores companies on acquisition-indicator signals so a GTM team can flag a likely M&A target before any deal is publicly announced.
- MCP Server for AI Agents: Exposes every signal category as an individually callable MCP tool, so an agent in Claude, Cursor, or Windsurf can query one signal type without ingesting a full dataset.
- Verified Three-Stage Pipeline: Every signal carries an original source link and passes a three-step sourcing check before it is published, instead of being listed as raw unverified text.
- REST API with Webhooks: Streams new signals into a CRM or data warehouse through webhooks or the v2 REST API, with pagination up to 100 results per call.
Pros
- Sub-minute signal delivery beats the weekly or monthly refresh cycle typical of exported contact databases.
- The MCP server lets an agent in Claude or Cursor call a single signal type directly, avoiding the custom glue code most sales-intelligence APIs require.
- Usage-based credit pricing avoids the flat per-seat licensing that contact-database tools like Apollo.io charge, so light users are not forced into a full seat.
Cons
- No persistent free plan: the only no-cost option is a time-limited trial, so ongoing use requires a paid plan.
- No published SOC 2, ISO 27001, or GDPR compliance page was found as of August 2026, which may slow enterprise security reviews.
- Coverage depends on public and semi-public web sourcing, so very early or stealth-stage companies may not yet have a signal.
Frequently Asked Questions
How much does Signalbase cost in 2026?
Signalbase's Pro plan is EUR 200 per month for 2,000 credits, where one credit covers a single signal or MCP tool call. Platforms that want to redistribute Signalbase data need the Data Partner plan, which starts at EUR 3,000 per month with custom volume pricing, an SLA, and priority support. Both plans bill monthly.
Is Signalbase free to use?
Signalbase has no permanent free tier. New accounts get a 7-day trial with 500 credits to test funding, hiring, and M&A signals before choosing a paid plan.
What are the best alternatives to Signalbase?
Apollo.io fits teams that mainly need a searchable contact database rather than event-based signals. Clay fits teams that want no-code waterfall enrichment across many providers instead of a dedicated signals API. Factors.ai fits teams that want inbound website-visitor intent data rather than outbound company event signals.
How does Signalbase compare to Apollo.io in 2026?
Apollo.io centers on a large contact database for prospecting and outreach, while Signalbase centers on real-time event detection, funding, hiring, M&A, and job changes, delivered by API, webhook, or MCP. Choose Apollo.io for contact-level outreach in one platform; choose Signalbase if you already have a CRM or agent stack and just need the trigger events feeding into it.
How do you get started with Signalbase?
Sign up at trysignalbase.com and grab an API key from the dashboard, which starts the trial automatically. From there, call the v2 REST API directly, connect Claude, Cursor, or Windsurf through the Signalbase MCP server, or stream events into a warehouse over webhooks.
Top Alternatives
- Apollo.io: Pick Apollo.io if you need a searchable contact database for outreach; pick Signalbase if you need event-based triggers to feed an existing stack.
- Clay: Pick Clay if you want no-code waterfall enrichment across many providers; pick Signalbase if you want a dedicated, verified signals API and MCP server.
- Factors.ai: Pick Factors.ai if you want inbound website-visitor intent data; pick Signalbase if you want outbound company event signals like funding and hiring.