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POST
/
simple
Simple swap
curl --request POST \
  --url https://api.leokit.dev/simple \
  --header 'Api-Key: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "from_asset": "ETH.ETH",
  "to_asset": "ARB.USDC-0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
  "amount": "0.5",
  "from_address": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb0",
  "to_address": "0x1234567890AbcdEF1234567890aBcdef12345678",
  "slippage_bps": "100"
}
'
{
  "quote_id": "01936b4a-7c8e-7890-abcd-ef1234567890",
  "protocol": "chainflip",
  "deposit_address": "0x8a3c1f2d4e5f67890abcdef1234567890abcdef1",
  "amount": "0.5",
  "amount_raw": "500000000000000000",
  "decimals": 18,
  "from_asset": "ETH.ETH",
  "to_asset": "ARB.USDC-0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
  "network": "ETH",
  "expected_amount_out": 499.5,
  "expected_amount_out_usd": 499.5,
  "total_swap_seconds": 120,
  "fees": [
    {
      "type": "Network Fee",
      "asset": "ETH",
      "amount": 0.001,
      "usd": 2.5
    }
  ],
  "payment_uri": "ethereum:0x8a3c1f2d4e5f67890abcdef1234567890abcdef1@1?value=500000000000000000",
  "qr_url": "https://cdn.leokit.dev/qr/01936b4a-7c8e-7890-abcd-ef1234567890.png",
  "expires_at": 1707400000
}

​
How It Works

1. POST /leokit/simple     → Quotes Chainflip & NEAR, picks best, returns deposit + QR
2. User scans QR or sends  → Sends funds to the deposit address
3. POST /leokit/status     → Poll with quote_id for swap completion
Compared to the standard multi-step flow (/quote → /deposit), this reduces two API calls to one. Only works with deposit-address-based protocols (Chainflip and NEAR).

​
Payment URI Standards

The payment_uri follows the wallet standard for the source chain:
Source ChainStandardExample
BTC, LTC, DOGE, DASHBIP-21bitcoin:bc1q...?amount=0.5
ETH, ARB, BASE (native)EIP-681ethereum:0x...@1?value=500000000000000000
ETH, ARB, BASE (ERC20)EIP-681ethereum:0xTOKEN@1/transfer?address=0x...&uint256=
SOL (native)Solana Paysolana:So1...?amount=2
OtherFallbackPlain deposit address

​
Example: BTC to ETH

curl -X POST https://api.leokit.dev/leokit/simple \
  -H "Content-Type: application/json" \
  -H "Api-Key: YOUR_API_KEY" \
  -d '{
    "from_asset": "BTC.BTC",
    "to_asset": "ETH.ETH",
    "amount": "0.01",
    "from_address": "bc1q...",
    "to_address": "0x1234567890AbcdEF1234567890aBcdef12345678"
  }'

​
Errors

StatusCodeDescription
400INVALID_ASSETfrom_asset or to_asset is malformed or not in the supported list
400INVALID_ADDRESSfrom_address or to_address not valid for the source/destination chain
400UNSUPPORTED_PAIRNo deposit-address-based route (Chainflip/NEAR) available for the pair
401INVALID_API_KEYMissing or invalid Api-Key header
404NO_QUOTE_AVAILABLEAll deposit-address protocols rejected the pair
500INTERNAL_ERRORQuote or deposit generation failed unexpectedly
See the error codes catalog for the full list.

Authorizations

​
Api-Key
string
header
required

Demo API-Key (Sandbox): 7037d2b3-9c76-4f62-b730-c544f7570fa4

Body

application/json

Request body for /simple. One-call swap endpoint for deposit-address protocols.

​
from_asset
string
required

Source asset identifier (CHAIN.SYMBOL-ADDRESS).

Example:

"ETH.ETH"

​
to_asset
string
required

Destination asset identifier (CHAIN.SYMBOL-ADDRESS).

Example:

"ARB.USDC-0xaf88d065e77c8cC2239327C5EDb3A432268e5831"

​
amount
string
required

Human-readable amount to swap.

Example:

"0.5"

​
from_address
string
required

Sender address on the source chain (used as refund address).

Example:

"0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb0"

​
to_address
string
required

Recipient address on the destination chain.

Example:

"0x1234567890AbcdEF1234567890aBcdef12345678"

​
slippage_bps
string

Slippage tolerance in basis points. Defaults to 150 (1.5%).

Example:

"100"

Response

Simple swap response with quote, deposit address, and QR code.

Response from /simple containing quote, deposit address, and QR code.

​
quote_id
string<uuid>
required

Quote identifier for tracking via /status.

​
protocol
enum<string>
required

Protocol selected (always chainflip or near).

Available options:
chainflip,
near
​
deposit_address
string
required

Address to send funds to.

​
amount
string
required

Human-readable amount to send.

​
amount_raw
string
required

Amount in smallest unit (wei, sats, etc.).

​
decimals
integer
required

Decimal places for the source asset.

​
from_asset
string
required

Source asset identifier.

​
to_asset
string
required

Destination asset identifier.

​
network
string
required

Source chain short name (e.g. ETH, BTC).

​
expected_amount_out
number
required

Expected output amount (human-readable).

​
payment_uri
string
required

Chain-specific payment URI (BIP-21, EIP-681, or Solana Pay).

​
qr_url
string
required

CDN URL of a QR code PNG encoding the payment_uri.

​
expected_amount_out_usd
number | null

Expected output in USD.

​
total_swap_seconds
integer | null

Estimated swap time in seconds.

​
fees
object[]

Fee breakdown.

​
expires_at
integer<int64> | null

Unix timestamp (seconds) when the deposit channel expires.