Most automation APIs bill by function call. You send a command. You pay the same fixed rate whether the operation succeeds or not. Coasty works differently. It bills by what the agent sees and does. The Computer Use API charges per prediction, per stateful step, per ground, and per run. Every cent is defined up front. This post lists every endpoint, every field, and the exact price per request. You can model your project budget before you write your first line of code.
How it works
The Computer Use API runs agents that open windows, click buttons, type text, and scroll. The client sends a screenshot and an instruction. The server returns actions. You loop capture, predict, act until the server reports status is done. The server consumes credits on every step. The price depends on the endpoint you use. Each endpoint has a fixed cost. Some endpoints are stateless. Others are stateful and use trajectory memory. Some endpoints are free. All costs are per request, not per session.
# Example: POST /v1/predict ($0.05 per request)
# Reads COASTY_API_KEY from the environment.
# Sends a screenshot and instruction to the Coasty Computer Use API.
curl -X POST https://coasty.ai/v1/predict \
-H "X-API-Key: ${COASTY_API_KEY}" \
-H "Content-Type: application/json" \
-d '{
"screenshot": "$(base64 -w 0 screen.png)",
"instruction": "Click the first button and type hello",
"cua_version": "v3"
}'
Endpoint pricing list
- POST /v1/predict: $0.05 per request. Takes a base64 screenshot, instruction, and cua_version. Returns actions and status. Loop until status is done.
- POST /v1/sessions: $0.10 per request. Creates a session with trajectory memory on the server. Use this for long-running tasks that need state.
- POST /v1/sessions/{id}/predict: $0.04 per request. Predicts actions for a specific session. Includes stateful trajectory memory.
- POST /v1/ground: $0.03 per request. Maps a screenshot and element description to x,y coordinates. Useful for precise clicking.
- POST /v1/parse: Free. Turns pyautogui code into structured actions.
- POST /v1/runs: $0.05 per agent step. The server drives an agent to completion. Tasks run to max_steps or deadline_seconds.
- POST /v1/workflows: $0.05 per agent step. Executes a versioned JSON DSL of runs with tasks, asserts, loops, and parallel steps.
The Coasty Computer Use API bills per agent step in runs and workflows, and per prediction or ground call. There are no hidden per-minute or per-hour rates.
Where this beats brittle automation
Traditional automation relies on selectors. You must maintain CSS IDs, XPath, or text content. UI changes, and your scripts break. The Computer Use Agent sees the screen like a human. It recognizes buttons by appearance and context. It adapts to layout shifts. You provide a natural language instruction. The agent decides which elements to interact with. This reduces maintenance and increases reliability. You pay only for what the agent actually does.
You now know the exact price for every Coasty Computer Use API endpoint. Set your budget in cents and start building agents that see, think, and act. Get your key at https://coasty.ai/developers and take the first step.
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