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HubSpot

What Ultron can do: Search contacts, list deals, create contacts, update deal stages, read pipeline data. Connection: HubSpot OAuth — Settings → Integrations → HubSpot → Connect Tools: hubspot_search_contacts, hubspot_list_deals, hubspot_create_contact How agents use it:
  • Specter saves enriched leads as new HubSpot contacts
  • Striker updates deal stages as conversations progress
  • Morning briefing pulls current pipeline state
  • Pipeline review analyzes deal velocity and stuck deals
Example: 
Show me all deals stuck in the Proposal stage for more than 14 days.

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Apollo

Apollo is Specter’s primary prospecting and enrichment tool. What Ultron can do: Search people (by title, company, location, seniority), search companies (by industry, size, funding stage), enrich individual leads with email and LinkedIn data. Connection: Apollo API key — Settings → Integrations → Apollo → Add API key Tools: search_people, search_companies, enrich_lead Example: 
Find CTOs at Series A B2B SaaS companies in the US with 50–500 employees.

Enrich this lead: Sarah Chen at Acme Corp. I need her verified email and LinkedIn URL.
Apollo is used in combination with ZeroBounce. Apollo finds and enriches contacts. ZeroBounce verifies the email before Striker sends.

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Stripe

What Ultron can do: List customers, list payments, list subscriptions, create payment links, create invoices, create subscription plans, pull revenue metrics. Connection: Stripe API key (restricted key recommended) — Settings → Integrations → Stripe → Add API key Tools: stripe_list_customers, stripe_list_payments, stripe_list_subscriptions, stripe_create_payment_link, stripe_create_invoice, stripe_revenue_metrics Example: 
Show me MRR for Q1 2026 and list the 5 customers with the highest LTV.

Create a payment link for $4,500/month for the Acme Corp proposal.