A B2B lead list is a snapshot — and snapshots rot
Anyone who sells a lead list is selling you a photograph of a moving object. The contacts were real when the file was written; the question is what happened between then and the moment your first email lands.
TAPAC takes the opposite position: there is no stored list. You ask for a profile, you get people who match it right now, and every address comes back with an SMTP verdict from the same call.
What the decay actually looks like
| Force | Published figure | What it does to your list |
|---|---|---|
| Addresses going dead | 40% within two years (NeverBounce) | Every month of storage costs you deliverability |
| Job changes | 23% annually (ZoomInfo, 2025) | The title is wrong, and often the mailbox is gone with it |
| Stale vs fresh data | 42% better performance for freshly sourced data (Harvard Business Review, 2024) | You are paying for the worse half of that gap |
| Typical bounce, stored list | 10–35% | Sending domains get burned before they get warmed |
| Typical bounce, checked at use | 2–5% | The same campaign, a different envelope |
The two bounce numbers describe the same send, separated only by when the check happened. That is the whole argument for building a list per request instead of buying one per year.
Building the list
curl -X POST https://tapacapi.com/v1/contacts/search \
-H "Authorization: Bearer ***" \
-H "Content-Type: application/json" \
-d '{"industry":"b2b saas","job_titles":["head of growth","demand gen"],
"company_size":"11-200","location":"netherlands","source":"website","limit":50}'
Each returned row carries the person, the company, the title, the source it was found in (website, telegram, discord) and the verification status of that mailbox. No second enrichment vendor, no CSV handoff, no window in which the data can age.
Where the contacts come from
Public web pages and public community channels — places where people state what they do. Community-sourced leads convert roughly 30% better than cold outreach (McKinsey, 2025), and personalised openers lift open rates about 3.2x (HubSpot, 2025). Both effects need a live address to land on.
What is deliberately missing
- No "500M contacts" claim. Volume is not the problem; the dated shelf life of a stored record is.
- No guesswork on catch-all domains — they come back labelled unknown instead of being reported as valid.
- No CRM, sequencer or inbox. TAPAC answers one question: who fits this profile, and does that mailbox exist right now.
Cost
Pay-per-use: 100 free searches, then $0.10–0.50 per verified contact. Verification is part of the search call, not a separate line item, and there is no seat licence — so running the same search from an agent costs the same as running it by hand.
From an agent
npx -y @tapacapi/mcp
or point an MCP-capable client at the hosted endpoint https://tapacapi.com/mcp. Two tools: tapac_find_contacts and tapac_status.
Where to go next
- B2B lead list · lead scraping tool · Telegram B2B contacts
- Install the TAPAC MCP server — npx, uvx or hosted endpoint, with the JSON block for Claude, Cursor, Codex and Windsurf.
- Verify email before sending · what an SMTP check proves · verification API
- Compare TAPAC with Apollo, ZoomInfo, Hunter and Lusha · Pricing · Get a free API key