Two ways to get B2B contacts: buy a static database and hope it is still accurate, or pull fresh contacts per use and verify each address over SMTP before you send. The difference shows up as bounce rate — and bounce rate is what burns the domain you send from.
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| Line | Why it matters |
|---|---|
| Bounced sends | Every bounce is a wasted send against your sending reputation. Mailbox providers watch the ratio, not your intent. |
| Usable contacts | You bought N contacts; you can only write to N minus bounces. Databases are sold on records, not on deliverable records. |
| True cost per usable contact | The number to compare across vendors. It is always higher than the list price you were quoted. |
| Seat cost | Static databases charge per seat per year before you export anything — and you keep paying for stale rows (23% of contacts change jobs annually, ZoomInfo 2025). |
Sources for the rates used as defaults: TAPAC bounce 2–5% vs 10–35% for static databases (TAPAC AGENTS.md), 23% of contacts change jobs annually (ZoomInfo 2025), 40% of emails dead within two years (NeverBounce), fresh scraped data outperforms stale databases by 42% (Harvard Business Review 2024).
TAPAC is a pay-per-use contact engine with SMTP verification, exposed as an MCP server so an agent can call it directly. 100 searches included, then $0.10–0.50 per contact — no seat, no annual contract.
npx -y @tapacapi/mcp
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Or compare against seat-priced vendors first: TAPAC vs Apollo / ZoomInfo / Hunter / Lusha.