feat: add USDC price cache and per-session spend cap - #42
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cost_estimator.py: cache USDC price for 60 seconds get_usdc_price() previously hit the CoinGecko API on every estimate_image_cost() call. The price is now stored in a process-level dict protected by threading.Lock and only refreshed when the 60-second TTL expires. Falls back to 1.0 on network error. tools.py: per-session spend cap Adds SESSION_SPEND_CAP_USD (env var, default $1.00). Before authorizing a payment, make_payment() checks that the session's running total plus the new cost would not exceed the cap. After a successful image generation the cost is added to session.total_spent_usd so subsequent requests correctly reflect cumulative usage.
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cost_estimator.py: cache USDC price for 60 seconds
get_usdc_price() previously hit the CoinGecko API on every
estimate_image_cost() call. The price is now stored in a
process-level dict protected by threading.Lock and only refreshed
when the 60-second TTL expires. Falls back to 1.0 on network error.
tools.py: per-session spend cap
Adds SESSION_SPEND_CAP_USD (env var, default $1.00). Before
authorizing a payment, make_payment() checks that the session's
running total plus the new cost would not exceed the cap. After a
successful image generation the cost is added to
session.total_spent_usd so subsequent requests correctly reflect
cumulative usage.
Issue #, if available:
Description of changes:
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