Send funds

Signs and broadcasts a transfer, and returns as soon as the network accepts it. ⚠️ **A `txHash` is not a confirmation.** Poll `/txid` until `status` flips from `pending` to `success` or `failed`. ## The fee comes out of the amount — for native assets **Native transfers (BTC, ETH, BNB, POL, TRX, SOL) are sent net of the network fee: the recipient receives `amount` − `fee`, not `amount`.** The transfer is sized so that the total leaving the wallet equals exactly the `amount` you asked for. If you need the recipient to receive an exact figure, add the fee (quote it with `/fee`) to the `amount` you send. **Token transfers (USDT, USDC) deliver the full `amount`.** Their fee is paid separately, in the chain's native coin — so a token wallet also needs a native balance for gas. ## Amounts `amount` is a **human-decimal string** (`"0.5"`), matched against `/^\d+(\.\d+)?$/` and parsed to base units with the asset's decimals. Never send base units, and never send a float you produced by arithmetic. Minimums are enforced: **0.00001 BTC**, and **0.0001** for a native EVM send (ETH, BNB, POL). Token sends must be greater than zero. An amount with more decimal places than the asset supports is rejected. ## Sender The **sender is resolved server-side** from `userId` + `assetId`. A client can never supply a private key or a from-address. `recipient` must differ from the sender.