POST
/
v1
/
swap
/
simulate
Simulate Swap
curl --request POST \
  --url https://api.amm.flashnet.xyz/v1/swap/simulate \
  --header 'Content-Type: application/json' \
  --data '{
  "amountIn": 100000000,
  "assetInAddress": "03bitcoinassetpubkey0000000000000000000000000000000000000000000000",
  "assetOutAddress": "03usdstablecoinpubkey111111111111111111111111111111111111111111111",
  "integratorBps": 25,
  "poolId": "03aabbccddeeff00112233445566778899aabbccddeeff00112233445566778899"
}'
{
  "amountOut": 4950000,
  "executionPrice": "0.00004950",
  "feePaidAssetIn": 50000,
  "priceImpactPct": "0.51%",
  "warningMessage": null
}

Body

application/json

Swap simulation parameters including pool, assets, and amount

Request body for simulating a swap without executing it.

Simulation allows users to preview swap outcomes including expected output, price impact, and fees before committing to the transaction.

​
poolId
string
required

LP public key of the pool to simulate the swap through. The pool must exist and be active.

Example:

"03aabbccddeeff00112233445566778899aabbccddeeff00112233445566778899"

​
assetInAddress
string
required

Address of the asset the user would provide. Must be one of the two assets in the selected pool.

Example:

"03bitcoinassetpubkey0000000000000000000000000000000000000000000000"

​
assetOutAddress
string
required

Address of the asset the user wants to receive. Must be the other asset in the selected pool.

Example:

"03usdstablecoinpubkey111111111111111111111111111111111111111111111"

​
amountIn
integer
required

Amount of input asset to simulate swapping, in its smallest unit. Must be positive. Larger amounts will show greater price impact.

Required range: x >= 0
Example:

100000000

​
integratorBps
integer | null

Optional integrator fee rate in basis points applied on the input amount. 25 bps = 0.25%

Required range: x >= 0
Example:

25

Response

Simulation completed successfully

Response from swap simulation with expected outcomes.

​
amountOut
integer
required

Expected amount of output asset the user would receive, in its smallest unit. This is after all fees are deducted.

Required range: x >= 0
Example:

4950000

​
executionPrice
string | null

Effective execution price of the swap. Shows how many units of output asset per unit of input asset.

Example:

"0.00004950"

​
feePaidAssetIn
integer | null

Total fee paid denominated in the input asset only. For B->A swaps, this includes LP, host, and integrator fees (all charged in B). For A->B swaps, host and integrator fees are charged in the output asset (B) and are therefore not included here; only the LP fee (in A) is reported.

Required range: x >= 0
Example:

50000

​
priceImpactPct
string | null

Price impact of the swap as a percentage. Higher values indicate more slippage from the ideal price.

Example:

"0.51%"

​
warningMessage
string | null

Warning message if the simulation detects potential issues. Common warnings include high slippage or low liquidity.

Example:

"High price impact detected"