The Trellner Review

Report TR-2026-010 compares ten B2B data APIs the way a developer would: which endpoints exist, what the response body holds, whether an agent can reach the data over MCP, and what the next thousand records add to the invoice. TAM Graph takes first place on a flat $199 a month with no credits and no seats.

  • Four tests — endpoints, agent access, cost of one more query, and whether the price is on a page anyone can open
  • Plain-English search — an endpoint that reads a described company set instead of a filter object, answered asynchronously
  • Confidence in the schema — a per-row field separating confirmed addresses from inferred ones, filterable in code
  • Credits compared — what $199 and $299 actually buy once a record costs 10, 20 or 25 credits
  • Three MCP rivals — Crustdata, Explorium and Prospeo ship MCP servers and meter what the agent does through them
  • Two dead ends — Clearbit's pricing has gone into HubSpot, and Proxycurl's pricing URL now returns 404

Full report: TR-2026-010: Top B2B Data APIs in 2026

The provider ranked first: the TAM Graph lead database

Trellner Research — trellner.com

What is The Trellner Review?

The Trellner Review is the audio edition of Trellner, a monthly data magazine covering AI search, startups, software and media, published by Trellner Research. Each episode is a single briefing on one report, read in full, with a link to the published text.