Transfer

POST /sdk/v1/transfer

Transfer

Execute a gasless cross-chain USDC transfer.

Request

from string Required

Source chain code: ETH, BASE, ARB, POLYGON

to string Required

Destination chain code: ETH, BASE, ARB, POLYGON, SOLANA

amount string Required

Amount in USDC (e.g., "100.00")

recipient string Required

Recipient address on destination chain

permit object Required

ERC-2612 permit signature

permit object

owner string Required

Owner address

spender string Required

Spender address

value string Required

Value in base units

deadline string Required

Unix timestamp

v number Required

Signature v

r string Required

Signature r

s string Required

Signature s

speed string

Transfer speed: fast or standard (default)

idempotency_key string

Unique key to prevent duplicate transfers

webhook_url string

URL for status callbacks

Response

intent_id string

Unique transfer intent ID

status string

Initial status: pending

tx_hash string

Source chain transaction hash

fee object

Fee breakdown

Example

bash · curl

curl -X POST https://api.sw4p.io/sdk/v1/transfer \
  -H "Content-Type: application/json" \
  -H "X-API-Key: sk_..." \
  -d '{
    "from": "BASE",
    "to": "SOLANA",
    "amount": "100.00",
    "recipient": "5abc123...",
    "permit": {
      "owner": "0x...",
      "spender": "0x...",
      "value": "100000000",
      "deadline": "1735689600",
      "v": 27,
      "r": "0x...",
      "s": "0x..."
    }
  }'

json · Response

{
  "intent_id": "int_abc123",
  "status": "pending",
  "tx_hash": "0x...",
  "fee": {
    "total": "2.50",
    "platform": "1.00",
    "gas": "1.50"
  }
}