Create an Auto-Conversion Rule for fiat->crypto, crypto->fiat, or crypto->crypto conversions.

Supported Assets:

• USD, USDC, USDT, PYUSD, RLUSD, USDG, USDP, EURC, MXNB
  Supported Networks:
• Fiat deposit networks: US_FEDWIRE, SWIFT
• Crypto networks: ETHEREUM, POLYGON, BASE, ARBITRUM, AVALANCHE, BNBCHAIN, SOLANA, TRON

Validation Rules:

• Supported pairs: fiat->crypto, crypto->fiat, and crypto->crypto; fiat->fiat is NOT supported
• Idempotency-Key header is required and must be a valid UUID v4
• Source network must match asset type (fiat asset requires fiat network, crypto asset requires crypto network)
• For crypto withdrawal destination: network is required when wallet_address is provided
• For fiat destination: network will be omitted

Withdrawal Configuration:

• Fiat-to-Crypto or Crypto->Crypto with withdrawal: provide wallet_address (external crypto wallet address)
• Crypto-to-Fiat with withdrawal: provide external_account_id (bank account ID from external-accounts API)
• Conversion-only (no withdrawal): omit both fields, converted funds remain in customer's account

Idempotency & Webhook Behavior:

• This endpoint creates resources asynchronously. The webhook notification may arrive before the HTTP response returns.
• Use the Idempotency-Key to query the resource status via webhook response, enabling proper idempotency control.
• Recommended flow: Instead of waiting for the HTTP response and then the webhook, clients can use the webhook arrival as the completion signal and query by Idempotency-Key to verify the result.
• This approach prevents "dangling wait" scenarios where clients unnecessarily wait for the HTTP response when the webhook has already confirmed the outcome.

Response & Status:

• The response will have status=PENDING and source_deposit_info=null because deposit info is being prepared asynchronously.
• Once deposit info is ready, the status will transition to ACTIVE and source_deposit_info will contain bank deposit details or crypto wallet address.
• Use the retrieve endpoint or webhook to get the full details when the rule becomes ACTIVE.