Coasty

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Feature	Coasty
STOA Rating	6.0
Description	Coasty gives you a REST API that runs autonomous tasks on managed Linux and Windows machines, so your app can delegate browser work to a computer-use agent without owning the infrastructure. You describe a goal, Coasty drives the machine to completion, and you watch progress through live SSE events or signed webhooks. It's a YC S26 company and bills $0.05 per completed step.
Strengths	•Clear tiered abstraction: task runs → workflows → machines → primitives, so you pick the right level of control •Test keys for safe CI/local dev with exact same request/response shapes as live •Automatic credit refunds on failed calls — you only pay for successful steps •llms.txt included and AI-coding-tool prompts generated on demand
Weaknesses	•YC S26 — very early, no public customer proof points yet •Pay-per-step pricing ($0.05/step) can add up quickly for long autonomous tasks •Docs-only URL scraped — full marketing site may have more context not captured here
Key Features	•POST a goal to /v1/runs and Coasty's agent drives a managed machine to completion autonomously •Compose tasks into multi-step workflows with branching, loops, budgets, and human-approval pauses •Drop to lower-level prediction primitives (session, predict, grounding, parse) when your app needs direct control •Test keys never bill and return mock responses — safe for local dev and CI •Billed $0.05 per completed step from a USD wallet; failed calls are automatically refunded
Pricing	Contact for pricing
Best For	All industries
AI Features	AI-Powered Coasty's core is an AI computer-use agent (CUA) that sees screenshots, predicts actions, and drives a real machine to a stated goal. Supports CUA versions v1–v5. You can use the agent's full autonomy or own the prediction loop yourself at the primitive level.
Categories	Build & ConnectBuild with AI
STOA Verdict	Coasty is a well-designed API for teams building products on top of computer-use agents — the tiered abstraction from task runs down to prediction primitives is thoughtful. It's very new (YC S26), so there's no track record yet. Worth watching if you're building autonomous agent workflows.
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Coasty

6.0AI

Coasty gives you a REST API that runs autonomous tasks on managed Linux and Windows machines, so your app can delegate browser work to a computer-use agent without owning the infrastructure. You describe a goal, Coasty drives the machine to completion, and you watch progress through live SSE events or signed webhooks. It's a YC S26 company and bills $0.05 per completed step.

Strengths

•Clear tiered abstraction: task runs → workflows → machines → primitives, so you pick the right level of control
•Test keys for safe CI/local dev with exact same request/response shapes as live
•Automatic credit refunds on failed calls — you only pay for successful steps
•llms.txt included and AI-coding-tool prompts generated on demand

Weaknesses

•YC S26 — very early, no public customer proof points yet
•Pay-per-step pricing ($0.05/step) can add up quickly for long autonomous tasks

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Coasty

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Strengths

Weaknesses

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Key Features