Seed and Series A make up 45 of 68 AI agent infrastructure rounds raised in 2026

Asked:

“Which AI agent infrastructure startups raised funding in 2026? name · amount · round”

A best-effort web census found 68 announced funding rounds from January 1 through September 30, 2026 by startups building horizontal infrastructure for AI agents — runtimes, orchestration, sandboxes, memory, web access, observability, security and agent-native payments. 67 rounds are disclosed in US dollars and one in euros; debt and vertical end-user agent apps are excluded.

Rounds by stage

Bar length = number of rounds; dark blue marks the early stages (seed and Series A). Labels show count and the sum of disclosed USD amounts (USD-coded rounds only; the €2.4M SolvaPay pre-seed is excluded from sums). Hover a bar for the companies behind it.

Temporal’s $550 million Series E is the single largest round of the year, more than the 27 seed rounds combined ($454M). kurums.com

The 10 Series B rounds total $700M disclosed — the largest stage by capital, led by Parallel Web Systems’ $100M for web-access APIs built for agents. theoutpost.ai

The biggest seed round is Sycamore’s $65M for building, securing and orchestrating agents — seed cheques in this census run from $3M to $65M. ranked.news

The one non-USD round is SolvaPay’s €2.4M pre-seed for agent-to-service payment rails. business20channel.tv

All 68 rounds

Name	Amount	Round	Announced	Infrastructure	Source

Best-effort web census of announced AI agent infrastructure funding rounds, January 1 – September 30, 2026, researched as of 2026-09-30. 68 rows, one per startup/funding event, from 63 distinct source hosts; no URL backs more than one row. Amounts are as reported at announcement; the bar chart sums only USD-coded disclosures. One mixed-currency Tsuga disclosure uses its stated USD equivalent; SolvaPay stays in EUR. Debt and vertical end-user agent applications are excluded. This is not a claim that a definitive universe exists.

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