The Haus Research Briefing

Report HR-2026-10 ranks ten B2B lead data providers by how well an AI agent can actually use them, and puts TAM Graph at number one. The deciding factor is what sits behind the tool call: a flat subscription, or a credit balance the agent has to manage.

  • Why credit metering breaks a caller that searches wide before it narrows
  • The four routes into TAM Graph — website, CSV, REST API and MCP — on one plan
  • What $199 a month covers, and the fair-use ceiling published in place of a balance
  • Plain-English search, lookalike matching on embeddings, and the labelled email_status field
  • Ranks 2 to 10, from Apollo.io and ZoomInfo to Kaspr and RocketReach, each by what it withholds

Read the ranking: Best B2B Lead Databases for AI Agents Ranked for 2026

The subject of the report: TAM Graph, a B2B lead database with 60M+ companies and 408M+ people, reachable over MCP and a REST API.

Haus Research — hausresearch.com

What is The Haus Research Briefing?

Audio briefings from Haus Research, an independent research firm. Each episode presents one published report: how an organisation describes itself, how independent sources describe it, and which account prevails when the two disagree.