Provider Selection

Provider Deep-Dive: Strengths & Weaknesses

Apollo (provider: apollo)

Best for: General people search, company enrichment, title/company filtering Strengths:

• Largest B2B database (270M+ contacts)
• Rich company profiles (tech stack, funding, employee count)
• Best title + company + location filtering
• Bulk enrichment (up to 10 per call) Weaknesses:
• School/education filter (person_education_school_names) is UNRELIABLE — returns generic results
• q_keywords free-text search is too broad for specific filtering
• organization_past_domains (past company search) returns poor results
• People search returns obfuscated data — needs separate enrichment for emails

RocketReach (provider: rocketreach)

Best for: Alumni searches, phone numbers, school-based filtering Strengths:

• school filter WORKS RELIABLY for university/education searches
• previous_employer filter WORKS for finding company alumni
• Higher phone number coverage than Apollo
• Email grading (A/A- grades are verified) Weaknesses:
• Smaller overall database than Apollo
• No bulk enrichment in one call
• Company enrichment is less detailed than Apollo
• Async lookups: some requests return status: "in_progress" and need polling

IMPORTANT for school searches:

• Always pass BOTH variants of the school name:

  {"school": ["IIT Kharagpur", "Indian Institute of Technology Kharagpur"]}
  

• Same for any school: ["MIT", "Massachusetts Institute of Technology"]
• RocketReach matches on the school name as stored in LinkedIn profiles

PredictLeads (provider: predictleads)

Best for: Company signals — jobs, tech, news, financing, similar companies Strengths:

• Real-time company signal data (jobs refresh every 36 hours)
• Structured, categorized events (not raw text)
• Similar companies uses ML scoring
• Financing data includes investors and round types Weaknesses:
• Company-only (no people data)
• Requires dual-key auth (token + key)
• Coverage varies: strong for US/EU companies, weaker for emerging markets

RapidAPI Google (provider: rapidapi_google)

Best for: Google search results for research, news monitoring, competitive intel Strengths:

• Real-time Google SERP results via RapidAPI (OpenWeb Ninja)
• Up to 300 results per query (no pagination needed)
• Google operators work in query: site:, filetype:, inurl:, intitle:, -keyword
• Time filters (qdr:h/d/w/m/y) for recent results
• Bulk search with concurrent execution Weaknesses:
• Single endpoint (web search only — news/images/maps are separate RapidAPI products)
• Failed requests still consume quota
• It's Google search — results are broad, not structured B2B data
• Need to craft good queries for useful results

Rate limits: 10-30 req/sec depending on tier ($25-$150/mo) Adaptive throttling: Response headers x-ratelimit-remaining, x-ratelimit-reset

Query patterns that work well:

• Funding: "{company}" "raised" OR "series" OR "funding"
• Hiring: site:linkedin.com/jobs "{company}"
• Tech stack: "{company}" "powered by" OR "built with" OR "uses"
• Leadership: "{company}" "appointed" OR "new hire" OR "joins as"
• LinkedIn: site:linkedin.com/in "{name}" "{company}"

BetterContact (provider: bettercontact)

Best for: Maximum email/phone coverage via waterfall enrichment (20+ providers) Strengths:

• Cascades through 20+ data providers automatically (Apollo, RocketReach, Hunter, etc.)
• Only charges for found + verified data (no credits for misses)
• 87-95% email coverage vs 60-70% from a single provider
• Built-in email verification (Bouncer) and catch-all validation
• Phone number coverage 70-85% (vs ~40% from single providers) Weaknesses:
• Async API — must poll for results or use webhooks (adds latency)
• Phone enrichment costs 10x email (10 credits vs 1)
• Cannot specify which underlying provider to use
• No company-only enrichment (people data only)
• Batch limit: 100 per request

Hunter (provider: hunter)

Best for: Email discovery by domain, email verification, email pattern detection Strengths:

• Domain Search finds ALL known emails at a company (up to 100)
• Email Finder generates likely email from name+domain with confidence score
• Email Verifier checks deliverability with specific status codes
• Free Email Count endpoint (no credits) — check coverage before spending
• Sources tracking shows WHERE emails were found Weaknesses:
• No phone numbers at all
• No people search by title/seniority (different tool category than Apollo)
• Free tier extremely limited (25 searches/month)
• Email Finder is pattern-based guessing, not verified contacts
• Confidence scores below 70 are unreliable

ZeroBounce (provider: zerobounce)

Best for: Email validation before campaigns — deliverability verification with detailed status codes Strengths:

• 99.6% validation accuracy with detailed status + sub_status
• Catch-all detection distinguishes accept_all (safer) vs catch-all (risky)
• Disposable, spam trap, and toxic email detection
• Credits never expire — buy once, use anytime
• No credit consumed for unknown results (server timeouts)
• Regional endpoints (US/EU) for GDPR compliance Weaknesses:
• Validation only — cannot find or enrich emails
• Single validation response time 1-30 seconds (varies by mail server)
• Batch endpoint limited to 200 emails, 5 requests/minute
• No phone validation

Instantly (provider: instantly)

Best for: Cold email campaign creation, sending, warmup, and analytics Strengths:

• Full campaign lifecycle via API (create, activate, pause, analytics)
• Unlimited email account connections with built-in warmup
• Lead management with campaign assignment and movement
• A/B testing and sequence building
• 6,000 req/min rate limit (generous) Weaknesses:
• API access requires Hypergrowth plan ($97/mo) or above — Growth plan has NO API
• V2 only — V1 is deprecated and incompatible
• Lead listing uses POST (not GET) — non-standard REST
• Sequences array quirk: only first element is used despite being an array
• Warmup must run 30+ days before campaign launch
• Hard caps on monthly emails (no overage billing, just pauses sending)

Parallel Web (provider: parallel_web)

Best for: Web scraping, content extraction, AI-powered web research at scale Strengths:

• AI-native API by Parallel (parallel.ai) — purpose-built for agents
• Search API with natural language objectives + keyword queries
• Extract API: clean markdown from any URL (JS, anti-bot, PDFs)
• Task API: async structured extraction with LLM (citations + confidence)
• Task Groups: batch processing up to 2,000 req/min
• Auto-batches >10 URLs with concurrent execution
• SOC-2 Type II certified Weaknesses:
• Extract capped at 10 URLs per API call (auto-batched by our provider)
• fetch_policy.max_age_seconds minimum is 600 (10 min cache)
• max_results not guaranteed on search
• Text-only output (no images)

Rate limits: Search/Extract 600/min, Tasks 2,000/min. GET polling is FREE. 20,000 free requests before paid pricing.

Common GTM Workflows (Multi-Provider)

1. ICP List Building

Apollo search_people (title + company size + industry)
  → Apollo enrich_person (get emails for top matches)
  → PredictLeads company_jobs (verify they're hiring = budget available)

2. Alumni Network Mining

RocketReach search_people (school="IIT Kharagpur", title filters)
  → Filter to people at target companies
  → Apollo enrich_person (get emails + company details)

3. Company Research Brief

Apollo enrich_company (firmographics)
  + PredictLeads company_news (recent events)
  + PredictLeads company_jobs (hiring signals)
  + PredictLeads company_technologies (tech stack)
  + RapidAPI Google search_web (press coverage, tbs=qdr:m)
  + Parallel Web scrape_page (pricing page, about page)

4. Competitive Intelligence

RapidAPI Google search_web (find competitor URLs)
  → Parallel Web scrape_page (extract pricing, features from multiple URLs)
  → Parallel Web extract_structured (structured comparison via Task API)
  → PredictLeads similar_companies (find more competitors)

5. Event-Triggered Outreach

PredictLeads company_news (new funding, expansion, product launch)
  → Apollo search_people (find decision makers at that company)
  → Apollo enrich_person (get contact info)

6. Full Outbound Pipeline (Enrichment → Validation → Campaign)

Apollo search_people (find ICP matches by title + company)
  → BetterContact enrich_person (waterfall for max email coverage)
  → ZeroBounce validate_email (verify all emails, remove invalid/disposable/spamtrap)
  → Instantly create_campaign (load verified leads, set sequences, activate)

7. Domain Email Discovery + Verification

Hunter domain_search (find all emails at target domain)
  → ZeroBounce batch_validate (verify deliverability of all found emails)
  → Filter to valid + accept_all only

8. Signal-Triggered Outbound Campaign

PredictLeads company_news (detect funding, expansion, product launch)
  → Apollo search_people (find decision makers)
  → BetterContact enrich_person (waterfall for best email coverage)
  → ZeroBounce validate_email (verify before sending)
  → Instantly create_campaign (personalized trigger-based outreach)

Auto-Selection Rules

The CLI and execution engine follow these rules:

1. If --school or --past-company flag is used → auto-select RocketReach
2. If operation starts with company_ → auto-select PredictLeads
3. If operation is search_web → auto-select RapidAPI Google
4. If operation is scrape_page, crawl_site, extract_structured, batch_extract → auto-select Parallel Web
5. If operation is validate_email or batch_validate → auto-select ZeroBounce
6. If operation is domain_search or email_finder → auto-select Hunter
7. If operation is create_campaign, manage_leads, or campaign_analytics → auto-select Instantly
8. If --waterfall flag is used or max coverage is requested → auto-select BetterContact for enrichment
9. Everything else (enrich, search people/companies) → default to Apollo
10. User can always override with --provider flag

Note: Parallel Web also supports search_web (AI-powered objective search). Use --provider parallel_web to get Parallel's agentic search instead of Google.