| Activity | Price |
|---|---|
| Search, method details, run and build status, the account | Free |
| A completed run | 1 credit |
| A query that answers | 5 credits |
| A public build within your plan's monthly allowance | Free |
| A public build beyond the allowance, or a private build | 100 credits |
| Repairs, and anything that fails or is cancelled | Free |
One credit is $0.01 at pay-as-you-go prices. Plans are on fous.com/pricing.
- A query holds 5 credits and charges them for any answer, even partial. No answer gives them back.
- A build holds 100 and charges only when it makes a method or a version. An in-place improvement is free and does not use the allowance. Changing your own private method is not charged as private again.
Limits and spending
GET /v1/account shows your balance, limits, free builds and prices:
Terminal
curl https://api.fous.com/v1/account \ -H "Authorization: Bearer $FOUS_API_KEY"JSON
{ "organization": { "id": "org_01M4CD7TVHDBPFQHZD05XMW5PB", "name": "Agent Test" }, "credits": { "balance": 585, "balance_usd": 5.85 }, "limits": { "requests_per_minute": 60, "concurrent_runs": 8, "monthly_spend_limit_credits": null }, "builds": { "free_per_month": 20, "used_this_month": 9 }, "prices": { "search": 0, "run": 1, "query": 5, "build_after_allowance": 100, "private_build": 100 }, "key": { "kind": "user", "name": "Server", "client_name": null, "expires_at": null, "last_used_at": "2026-10-23T09:11:15.000Z" }}In Studio, Billing holds credits, plans and auto-recharge. Usage shows spending, and its Limits tab sets a monthly spend limit and alerts. A call your credits or spend limit do not cover is refused, free:
JSON
{ "error": { "code": "insufficient_credits", "message": "This run costs 1 credit, and your organization has 0.", "next_step": "Add credits at https://app.fous.com/billing. Nothing was charged." , "required_credits": 1, "available_credits": 0, "billing_url": "https://app.fous.com/billing" , "doc_url": "https://docs.fous.com/guides/errors#insufficient_credits" , "request_id": "req_mh7c2k9xQ1v3Zt8LbN0pRwY4" }}Negotiated agreements are managed in Studio under Billing. Questions: billing@fous.com.