Seamless.AI B2B Sales Intelligence REST API
Seamless.AI B2B sales intelligence REST API for sales teams, SDRs, recruiters, and marketers to find verified contact information (email, phone, LinkedIn), company data, and buying intent signals — enabling automated lead generation, prospect research, contact enrichment, and sales pipeline building through Seamless.AI's real-time contact verification platform with 1.3B+ contacts and 121M+ company profiles. Enables AI agents to manage contact search for B2B prospect email and phone discovery automation, handle company search for company profile and employee data automation, access intent data for buyer buying signal and research activity automation, retrieve contact enrichment for existing contact data completion automation, manage bulk search for large-scale prospect list building automation, handle verification for real-time email and phone validation automation, access technographic data for technology stack identification automation, retrieve firmographic for company size, industry, and revenue data automation, manage list export for CRM-ready prospect list generation automation, and integrate Seamless.AI with Salesforce, HubSpot, Outreach, and Salesloft for automated prospecting and sales pipeline automation.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
B2B data. CCPA. API key. US. Professional contact and business data.
⚡ Reliability
Best When
A B2B sales team, SDR, recruiter, or marketer wanting AI agents to automate prospect discovery, find verified contact information, enrich CRM data, and build targeted account lists through Seamless.AI's real-time B2B contact intelligence platform.
Avoid When
CREDITS ARE CONSUMED PER CONTACT: Seamless.AI uses credit system for contact lookups; automated unlimited contact discovery assumption creates credit_exhaustion; automated must monitor credit balance and implement credit management strategy. DATA ACCURACY IS REAL-TIME VERIFIED: Seamless.AI verifies contacts in real-time; automated pre-verified assumption creates verification_required for each new contact search; automated must account for verification latency in real-time contact lookups. GDPR AND PRIVACY COMPLIANCE IS USER RESPONSIBILITY: Seamless.AI provides data but compliance with GDPR, CASL, and cold outreach laws is user responsibility; automated no-compliance assumption creates regulatory_risk for European or Canadian contact outreach; automated must implement appropriate legal basis for contacting Seamless.AI provided contacts. CRM INTEGRATION REQUIRES CONFIGURATION: Seamless.AI CRM sync requires per-CRM setup; automated instant CRM sync assumption creates sync_not_configured without CRM integration setup; automated must configure CRM connection before expecting automated data sync.
Use Cases
- • Finding verified email and phone contacts for B2B sales prospecting automation agents
- • Enriching CRM contacts with missing phone numbers and email addresses for sales ops automation agents
- • Building targeted prospect lists by job title, industry, and company size for SDR automation agents
- • Identifying companies researching specific topics via intent data for marketing automation agents
Not For
- • Consumer lead generation (Seamless.AI is B2B professional contact data, not B2C consumer data)
- • Deep company financial data (Seamless.AI provides firmographics, not financial statements or ownership)
- • Academic or research databases (Seamless.AI is for sales prospecting, not academic research)
Interface
Authentication
Seamless.AI uses API key for sales intelligence REST API. REST API with JSON. Columbus, OH HQ. Founded 2015 by Brandon Bornancin. Products: Contact Search, Company Search, Intent Data, Chrome Extension. 1.3B+ contacts, 121M+ companies. Credit-based. Raised $170M. Competes with ZoomInfo, Apollo, and Lusha for B2B sales intelligence.
Pricing
Columbus OH. Credit-based subscription. 1.3B+ contacts. Freemium. $170M raised. SDR-focused.
Agent Metadata
Known Gotchas
- ⚠ CREDITS ARE CONSUMED PER SUCCESSFUL CONTACT: Each verified contact lookup consumes credits; automated bulk-search assumption creates rapid_credit_depletion for large prospecting campaigns; automated must implement credit monitoring and batch size limits
- ⚠ REAL-TIME VERIFICATION ADDS LATENCY: Seamless.AI verifies contacts in real-time creating 2-5 second latency per search; automated sub-second assumption creates timeout for bulk contact enrichment; automated must implement appropriate timeouts and retry logic
- ⚠ NOT ALL CONTACTS ARE VERIFIABLE: Some contacts cannot be verified by Seamless.AI; automated 100%-verified assumption creates unverified_contact results for some searches; automated must handle and filter unverified results
- ⚠ OUTREACH LAW COMPLIANCE IS MANDATORY: B2B cold email and phone outreach is regulated (CAN-SPAM, GDPR, CASL); automated regulation-free outreach assumption creates legal_risk; automated must implement opt-out, privacy notice, and consent mechanisms for outreach campaigns
- ⚠ DUPLICATE CONTACTS ARE COMMON: Contact database may have duplicate entries for same person; automated unique-contact assumption creates duplicate_outreach for prospects with multiple entries; automated must implement contact deduplication before CRM import
Alternatives
Full Evaluation Report
Comprehensive deep-dive: security analysis, reliability audit, agent experience review, cost modeling, competitive positioning, and improvement roadmap for Seamless.AI B2B Sales Intelligence REST API.
AI-powered analysis · PDF + markdown · Delivered within 30 minutes
Package Brief
Quick verdict, integration guide, cost projections, gotchas with workarounds, and alternatives comparison.
Delivered within 10 minutes
Score Monitoring
Get alerted when this package's AF, security, or reliability scores change significantly. Stay ahead of regressions.
Continuous monitoring
Scores are editorial opinions as of 2026-03-07.