Build vs buy: web agent infrastructure

Every layer of running web agents at scale, and the question each one raises: build it yourself, or buy it?

• Anatomy of a web agent

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  Interactive diagram: hover, tap, or focus each faculty (hands, passport, eyes, judgment, plumbing) to see the infrastructure layer it maps to.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/agent-anatomy" data-embed="agent-anatomy" style="width:100%;border:0" loading="lazy"></iframe>

• One mismatch is all it takes

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  Interactive diagram: toggle network, rendering, and behavioural signals and watch one mismatch flip the verdict from human to automated.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/browser-identity-coherence" data-embed="browser-identity-coherence" style="width:100%;border:0" loading="lazy"></iframe>

• IP reputation decay

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  Interactive pool simulation: datacenter ranges are blocked on sight, residential reputation decays over time, and rotating the pool recovers it.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/ip-reputation-decay" data-embed="ip-reputation-decay" style="width:100%;border:0" loading="lazy"></iframe>

• Chrome CVEs per year

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  Stacked bar chart of disclosed Chrome CVEs per year, with the share exploited in the wild before a patch shipped.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/chrome-cves" data-embed="chrome-cves" style="width:100%;border:0" loading="lazy"></iframe>

• Video vs DOM replay

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  Interactive tradeoff: scrub one synthetic session and switch between video and DOM reconstruction to see what DOM replay loses on cross-origin frames and canvas.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/video-vs-dom-replay" data-embed="video-vs-dom-replay" style="width:100%;border:0" loading="lazy"></iframe>

• Model gateway

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  Interactive diagram: flip between an agent wired to every model and one clean gateway call, then send requests to watch it route, cache, and fall back.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/model-gateway" data-embed="model-gateway" style="width:100%;border:0" loading="lazy"></iframe>

• Warm pool economics

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  Interactive widget: drag the arrival rate to see required idle browsers, the idle-to-active ratio, and cost per session change with scale.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/warm-pool-economics" data-embed="warm-pool-economics" style="width:100%;border:0" loading="lazy"></iframe>

• Cost of building

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  Plug in containers, compute rate, token spend, salary, and infra time to see engineering time dominate the annual build cost.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/cost-of-building" data-embed="cost-of-building" style="width:100%;border:0" loading="lazy"></iframe>

• Build vs buy

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  Answer each question to trace your own build-vs-buy call: a few strategic reasons resolve to build, everything else to buy.

  <iframe src="https://gtm-blog-embeds.vercel.app/embeds/build-vs-buy-flowchart" data-embed="build-vs-buy-flowchart" style="width:100%;border:0" loading="lazy"></iframe>