Fee for a platform wallet transfer

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What a transfer out of **your platform's own wallet** will cost — the twin of [`/fee`](/api-reference/fees/get-fee), with one difference: the `sender` is resolved server-side to the platform wallet's address, so the body is just `assetId` and `recipient`. A `sender` you supply is ignored. The quote describes the [`/platform/send`](/api-reference/platform-wallet/send-platform-transfer) that follows it: a decimal string in the chain's native currency on Bitcoin, EVM and Solana, a resource object on TRON. Do not send an `X-USER-ID` header here — a platform endpoint always acts as the platform wallet, and sending one is a `400`.

Authentication

AuthorizationBearer

A 15-minute token from /auth. Required on every endpoint except /auth.

Headers

X-Request-IdstringOptional

Correlation id. Generated if omitted, echoed on every response, and written to the audit log. /send is the exception — there it is required, and it doubles as the idempotency key.

Request

This endpoint expects an object.
assetIdenumRequired
Primary asset selector. An all-digit string (`"21"`) is accepted and normalised to an integer. - `1` — BITCOIN BTC (native, 8 decimals) - `2` — ETHEREUM ETH (native, 18 decimals) - `21` — ETHEREUM USDT (ERC20, 6 decimals) - `22` — ETHEREUM USDC (ERC20, 6 decimals) - `3` — BSC BNB (native, 18 decimals) - `31` — BSC USDT (BEP20, 18 decimals) - `32` — BSC USDC (BEP20, 18 decimals) - `4` — TRON TRX (native, 6 decimals) - `41` — TRON USDT (TRC20, 6 decimals) - `42` — TRON USDC (TRC20, 6 decimals) — not on every endpoint - `5` — POLYGON POL (native, 18 decimals) - `51` — POLYGON USDT (ERC20, 6 decimals) — not on every endpoint - `52` — POLYGON USDC (ERC20, 6 decimals) - `6` — SOLANA SOL (native, 9 decimals) - `61` — SOLANA USDT (SPL, 6 decimals) — not on every endpoint - `62` — SOLANA USDC (SPL, 6 decimals)
recipientstringRequired
Destination address on the asset's chain. Must differ from the platform wallet's own address.

Response

OK
resultstring or object

A decimal string in the chain’s native currency on Bitcoin, EVM and Solana; a resource object on TRON.

requestIdstring

Echo of the inbound X-Request-Id, or a generated one.

Errors

400
Bad Request Error
401
Unauthorized Error
403
Forbidden Error
404
Not Found Error
503
Service Unavailable Error