# Estimate network fee for a transfer

Estimate the network fee for a transfer.
Returns fee estimates for different speed tiers (slow, standard, fast).

Endpoint: POST /v1/chain/estimate-fee
Version: 2.0.0
Security: oAuth2

## Request fields (application/json):

  - `network` (string, required)
    Enum: "ethereum", "polygon", "solana", "bitcoin"

  - `from` (string, required)
    Sender address

  - `to` (string, required)
    Recipient address

  - `asset` (string, required)
    Asset symbol (e.g., USDT, ETH)
    Example: "USDT"

  - `amount` (string, required)
    Amount to transfer
    Example: "10.0"

## Response 200 fields (application/json):

  - `network` (string, required)
    Enum: "ethereum", "polygon", "solana", "bitcoin"

  - `estimatedFee` (object, required)

  - `estimatedFee.amount` (string)
    Example: "0.12"

  - `estimatedFee.currency` (string)
    Native currency of the network
    Example: "MATIC"

  - `estimatedFee.tier` (string)
    Enum: "slow", "standard", "fast"

  - `alternatives` (array)
    Fee estimates for other tiers

## Response 400 fields (application/json):

  - `traceId` (string, required)
    Correlation id for troubleshooting
    Example: "trc_01JH8K5P3V9M2K5Q7W6J3Z1A9B"

  - `error` (object, required)

  - `error.code` (string)
    Example: "INVALID_REQUEST"

  - `error.message` (string)
    Example: "Invalid webhook URL"

  - `error.details` (object)


## Response 401 fields