Phase 3 — Fee Estimator

[devdavidejesus]

Phase 3 — Fee Estimator

Real-time fee estimation based on current mempool state.

Scope

• Fetch recommended fee rates (fastest, half-hour, hour, economy, minimum)
• Display current mempool depth (size in MB, tx count)
• Historical fee comparison (optional)

Endpoints

• GET /api/v1/fees/recommended
• GET /api/mempool

CLI interface

python -m btc_toolkit fees
python -m btc_toolkit fees --json

Constraints

• Zero external dependencies (stdlib only)
• Unit tests with mocked API responses
• Clearly labeled sat/vB units

References

• Mempool.space API docs: https://mempool.space/docs/api/rest#get-recommended-fees