Fee Address Routing and Protocol Revenue Integrity

WAproxy deducts protocol fee from amount_sat
and routes it to a predefined fee address per coin.

Fee routing must be deterministic and explicit.

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FEE CALCULATION
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protocol_fee = amount_sat × FEE_BPS / 10000

receiver_gets = amount_sat - protocol_fee

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FEE DESTINATION MODEL
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Each supported coin defines:

COIN_FEE_ADDR_MAIN
COIN_FEE_ADDR_TEST

Fee routing must:

- match selected network (main/test)
- use configured fee address
- be applied deterministically

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TRANSACTION STRUCTURE
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Outgoing transaction may contain:

- Output 1: recipient address (receiver_gets)
- Output 2: protocol fee address (protocol_fee)

Network fee remains separate and paid by wallet.

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INTEGRITY REQUIREMENTS
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Fee routing must:

- not modify amount_sat definition
- not depend on market conditions
- not be dynamically altered per request
- not be skipped under retry

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ATTACK PREVENTION
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Fee address must not:

- be client-supplied
- be mutable via API
- be influenced by idempotency replay

It is server-configured and static.

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ACCOUNTING DISCIPLINE
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For each wallet_send:

- Store protocol_fee
- Store fee_address
- Store recipient_amount
- Store txid

This enables:

- deterministic auditing
- revenue reconciliation
- financial transparency

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ARCHITECTURAL STATEMENT
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Protocol revenue must be deterministic,
transparent, and non-negotiable.

WAproxy enforces fee routing
as part of execution integrity.