pub const MAX_RATE_PER_MB: u64 = 1000;Expand description
Maximum permitted value for ProbeResponseBody::rate_per_mb (issue #378).
1000 µUSDC/MB (USDC at 6 decimals: ~$1/GB), a realistic ceiling about 100×
market price (~10 µUSDC/MB ≈ $0.01/GB). It bounds two things at once. It is
the largest rate_per_mb the wire decodes, and it caps the governance
deliveryFloor on-chain (ADR 003 §Rate-floor enforcement); the floor can
never exceed the wire price. A cap far above market lets a governance floor
near the ceiling drive credited bytes toward zero and suppress ADR-036
vote-weight accrual, so the cap stays close to real prices.
The value also participates in the client selection score
rate_per_mb × rtt_ms × scale / reputation² (issue #322, ADR 001 §Node
Selection Algorithm); a peer-controlled u64::MAX would overflow the
multiplication and could silently let a malicious node win the selection.
Selection-formula callers SHOULD still use saturating arithmetic as
defense-in-depth — the bound is the protocol-boundary check, not a
substitute for safe math.