--- updatedAt: 2026-05-14T11:27:34.000Z --- Fetch the complete documentation index at: https://docs.blockdaemon.com/llms.txt. Use this file to discover all available pages before exploring further. Append .md to any documentation page URL to get its markdown version. # Create Bridge Swap Transaction Enables seamless, cross-chain token exchanges by swapping assets between supported blockchain networks. This endpoint processes the swap transaction securely and efficiently, converting tokens from one chain to another while managing the necessary transaction parameters. The response provides key details—including source and destination chain IDs, sender and receiver addresses, transferred value, gas specifications, and a unique reference ID—allowing developers and users to verify and track the swap transaction. > 💡 **Compute Unit Value:** `80` (Fixed) # OpenAPI definition ```json { "openapi": "3.0.0", "info": { "contact": { "name": "Blockdaemon", "email": "info@blockdaemon.com" }, "description": "The Blockdaemon DeFi API provides a single interface to a multitude of DeFi projects and blockchains", "title": "Blockdaemon DeFi API", "version": "1.0.0", "x-logo": { "altText": "Blockdaemon logo", "backgroundColor": "#fafafa", "url": "https://storage.googleapis.com/blockdaemon-app-static-images/marketing/PNG/dark-logo.png" } }, "externalDocs": { "description": "Blockdaemon DeFi documentation", "url": "http://www.blockdaemon.com/api/defi" }, "servers": [ { "url": "https://svc.blockdaemon.com" } ], "components": { "securitySchemes": { "ApiKeyAuth": { "type": "apiKey", "in": "header", "name": "X-API-Key", "description": "`X-API-Key: ` header must be set to authenticate API requests.You can create tokens in the \"Configure\" tab of your API access area at https://app.blockdaemon.com." } }, "schemas": { "_bridge_swap_Request": { "type": "object", "properties": { "bridgeId": { "type": "string", "description": "The unique ID to specify the bridge protocol for routing cross-chain queries or transactions. Find more [here](https://docs.blockdaemon.com/docs/defi-api-supported-protocols#supported-bridges-protocols).", "enum": [ "100", "600", "300", "400", "500" ], "example": "100" }, "srcTokenSymbol": { "type": "string", "description": "Symbol of the token to swap.", "example": "usdt" }, "dstChainId": { "type": "string", "description": "The unique chain ID to specify the destination chain. Find more [here](https://docs.blockdaemon.com/docs/defi-api-supported-protocols#supported-chains).", "example": "1" }, "amountIn": { "type": "string", "description": "Amount of the input token to provide, specified in the token's smallest denomination (base units). Do not send human-readable decimal values. Examples: to swap 1 WETH (18 decimals), use \"1000000000000000000\"; to swap 1 USDC (6 decimals), use \"1000000\".", "example": "1000000000000000000" }, "from": { "type": "string", "description": "Blockchain address of the token sender. For EVM chains, use a checksummed hex address (e.g., 0xABCDEF...). This address must hold sufficient balance of the input token and will sign the transaction.", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "amountOutMin": { "type": "string", "description": "Minimum acceptable output amount in the token's smallest denomination (base units). Provides slippage protection — the transaction reverts if the output falls below this value. Set to \"0\" to disable slippage protection. Examples: to require at least 0.99 USDC (6 decimals), use \"990000\"; to require at least 0.99 WETH (18 decimals), use \"990000000000000000\".", "example": "0" }, "gas": { "type": "string", "description": "Maximum number of gas units to allocate for the transaction, as an integer string (e.g., '200000'). If omitted, gas is estimated automatically. Note: this is gas units, not wei or gwei.", "example": "100000" }, "to": { "type": "string", "description": "Blockchain address of the token recipient. For EVM chains, use a checksummed hex address (e.g., 0xABCDEF...). Output tokens are delivered to this address after the swap.", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "dstTokenSymbol": { "type": "string", "description": "Symbol of the token to be received after the swap.", "example": "ETH" }, "srcChainId": { "type": "string", "description": "The unique chain ID to specify the source chain. Find more [here](https://docs.blockdaemon.com/docs/defi-api-supported-protocols#supported-chains).", "example": "1" }, "srcChainSymbol": { "type": "string", "description": "Symbol of the source chain.", "example": "ETH" }, "srcTokenAddress": { "type": "string", "description": "Contract address of the source (input) token on the source chain. For EVM chains, use a checksummed hex address (e.g., 0x...). Either srcTokenAddress or srcTokenSymbol must be provided.", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "dstTokenAddress": { "type": "string", "description": "Contract address of the destination (output) token on the destination chain. For EVM chains, use a checksummed hex address (e.g., 0x...). Either dstTokenAddress or dstTokenSymbol must be provided.", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "slippage": { "type": "string", "description": "Maximum acceptable slippage as a percentage of the swap value. Valid range: 0 to 100 (e.g., 1 = up to 1% slippage). Defaults to 1. The transaction reverts if the output deviates more than this percentage from the quoted price.", "example": "10" }, "gasPriority": { "type": "string", "description": "Specifies the priority level for gas fees (e.g., 'low', 'medium', or 'high'), which influences the transaction speed and cost.", "example": "low" }, "enableFee": { "type": "boolean", "description": "Flag to include a basis points fee transaction alongside the main transaction when set to true.", "example": false }, "batchOption": { "type": "string", "description": "Transaction batching standard to use. Supported values: 'EIP-5792' (wallet-level batching via wallet_sendCalls) or 'EIP-7702' (EOA code delegation via batcherContract). Requires batcherContract when using EIP-7702.", "enum": [ "EIP-5792", "EIP-7702" ], "example": "EIP-5792" }, "batcherContract": { "type": "string", "description": "The EOA address of the batcher that will be used to execute the transaction when using EIP-7702 batching. If not provided, the default batcher contract for the chain will be used.", "example": "0x9c933f9d2efd76ce25b0d3dde84d3f94e78a50ca" }, "simulate": { "type": "boolean", "description": "When true, dry-runs the transaction batch via eth_simulateV1 and returns a simulate field with status and error on each transaction.", "example": false }, "transferMode": { "type": "string", "description": "Specifies the mode of token transfer. The first is taxi, where tokens are sent to the destination chain at the moment of swap. The second is bus ride. Bus ride means that multiple user swaps are batched together. ", "example": "bus" } }, "required": [ "dstChainId", "amountIn", "from", "to", "srcChainId" ], "description": "The request body for a /defi/v1/bridge/swap", "example": { "bridgeId": "100", "srcTokenSymbol": "usdt", "dstChainId": "1", "amountIn": "1000000000000000000", "from": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "amountOutMin": "0", "gas": "100000", "to": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "dstTokenSymbol": "ETH", "srcChainId": "1", "srcChainSymbol": "ETH", "srcTokenAddress": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "dstTokenAddress": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "slippage": "10", "gasPriority": "low", "enableFee": false, "batchOption": "EIP-5792", "batcherContract": "0x9c933f9d2efd76ce25b0d3dde84d3f94e78a50ca", "simulate": false, "transferMode": "bus" } } } }, "tags": [ { "name": "bridge", "description": "API endpoints for operations related to bridges" } ], "security": [ { "ApiKeyAuth": [] } ], "paths": { "/defi/v1/bridge/swap": { "post": { "tags": [ "bridge" ], "summary": "Create Bridge Swap Transaction", "description": "Enables seamless, cross-chain token exchanges by swapping assets between supported blockchain networks. This endpoint processes the swap transaction securely and efficiently, converting tokens from one chain to another while managing the necessary transaction parameters. The response provides key details—including source and destination chain IDs, sender and receiver addresses, transferred value, gas specifications, and a unique reference ID—allowing developers and users to verify and track the swap transaction.\n\n> 💡 \n**Compute Unit Value:** `80` (Fixed)", "operationId": "bridgeSwap", "requestBody": { "required": true, "description": "The request body for a /defi/v1/bridge/swap", "content": { "application/json": { "schema": { "$ref": "#/components/schemas/_bridge_swap_Request" }, "example": { "bridgeId": "100", "srcTokenSymbol": "usdt", "dstChainId": "1", "amountIn": "1000000000000000000", "from": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "amountOutMin": "0", "gas": "100000", "to": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "dstTokenSymbol": "ETH", "srcChainId": "1", "srcChainSymbol": "ETH", "srcTokenAddress": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "dstTokenAddress": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402", "slippage": "10", "gasPriority": "low", "enableFee": false, "batchOption": "EIP-5792", "batcherContract": "0x9c933f9d2efd76ce25b0d3dde84d3f94e78a50ca", "simulate": false, "transferMode": "bus" } } } }, "responses": { "200": { "description": "Successful response", "content": { "application/json": { "schema": { "type": "object", "properties": { "status": { "type": "number", "description": "Numeric status code indicating success or failure of the API call", "example": 200 }, "msg": { "type": "string", "description": "Human-readable message describing the API result or error" }, "data": { "anyOf": [ { "type": "object", "properties": { "chainId": { "type": "string", "description": "Blockchain network identifier (EVM chain ID, Solana chain name, etc.)", "example": "1" }, "from": { "type": "string", "description": "Sender's wallet address", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "to": { "type": "string", "description": "Recipient's wallet address", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "value": { "type": "string", "description": "Amount being transferred or involved in a transaction", "example": "10" }, "gas": { "type": "string", "description": "Gas limit for the transaction", "example": "100000" }, "gasPrice": { "type": "string", "description": "Price per gas unit for the transaction", "example": "10000" }, "data": { "type": "string", "description": "Main payload object or array returned by the API", "example": "0x40e53eb7000000000000000000000000000000000000000000000000000000000016e360" }, "estimationCheck": { "oneOf": [ { "type": "string" }, { "type": "boolean" } ], "description": "Flag or value indicating transaction fee/estimate status" }, "referenceId": { "type": "string", "description": "Unique ID for tracking a specific transaction or operation", "example": "8eec8150896e4fdaa26d4d1a1338d676" }, "simulate": { "type": "object", "description": "Present when the request used `simulate: true`; eth_simulateV1 summary (omitted when simulation was not run).", "properties": { "status": { "type": "string", "enum": [ "success", "failure" ] }, "error": { "type": "string", "nullable": true, "description": "Failure reason when status is failure; null when status is success" } }, "required": [ "status", "error" ] } }, "required": [ "chainId", "from", "data", "referenceId" ] }, { "type": "object", "properties": { "createFeeTxn": { "type": "object", "properties": { "chainId": { "type": "string", "description": "Blockchain network identifier (EVM chain ID, Solana chain name, etc.)", "example": "1" }, "from": { "type": "string", "description": "Sender's wallet address", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "to": { "type": "string", "description": "Recipient's wallet address", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "value": { "type": "string", "description": "Amount being transferred or involved in a transaction", "example": "10" }, "gasPrice": { "type": "string", "description": "Price per gas unit for the transaction", "example": "10000" }, "gas": { "type": "string", "description": "Gas limit for the transaction", "example": "100000" }, "simulate": { "type": "object", "description": "Present when the request used `simulate: true` with `enableFee: true`; fee leg eth_simulateV1 summary.", "properties": { "status": { "type": "string", "enum": [ "success", "failure" ] }, "error": { "type": "string", "nullable": true, "description": "Failure reason when status is failure; null when status is success" } }, "required": [ "status", "error" ] } }, "required": [ "chainId", "from", "to", "value" ] }, "swapTxn": { "type": "object", "properties": { "chainId": { "type": "string", "description": "Blockchain network identifier (EVM chain ID, Solana chain name, etc.)", "example": "1" }, "from": { "type": "string", "description": "Sender's wallet address", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "to": { "type": "string", "description": "Recipient's wallet address", "example": "0xdAe2F6EdDdA6fb4fb60cc02633DE27e2b431B402" }, "value": { "type": "string", "description": "Amount being transferred or involved in a transaction", "example": "10" }, "gas": { "type": "string", "description": "Gas limit for the transaction", "example": "100000" }, "gasPrice": { "type": "string", "description": "Price per gas unit for the transaction", "example": "10000" }, "data": { "type": "string", "description": "Main payload object or array returned by the API", "example": "0x40e53eb7000000000000000000000000000000000000000000000000000000000016e360" }, "estimationCheck": { "oneOf": [ { "type": "string" }, { "type": "boolean" } ], "description": "Flag or value indicating transaction fee/estimate status" }, "referenceId": { "type": "string", "description": "Unique ID for tracking a specific transaction or operation", "example": "8eec8150896e4fdaa26d4d1a1338d676" }, "simulate": { "type": "object", "description": "Present when the request used `simulate: true`; eth_simulateV1 summary (omitted when simulation was not run).", "properties": { "status": { "type": "string", "enum": [ "success", "failure" ] }, "error": { "type": "string", "nullable": true, "description": "Failure reason when status is failure; null when status is success" } }, "required": [ "status", "error" ] } }, "required": [ "chainId", "from", "data", "referenceId" ] } }, "required": [ "createFeeTxn", "swapTxn" ] }, { "type": "object", "properties": { "from": { "type": "string" }, "chainId": { "type": "string" }, "referenceId": { "type": "string" }, "methodUsed": { "type": "string", "enum": [ "EIP-5792", "EIP-7702" ] }, "calls": { "type": "array", "items": { "type": "object", "properties": { "to": { "type": "string" }, "value": { "type": "string" }, "data": { "type": "string" } }, "required": [ "to", "value", "data" ] } } }, "required": [ "from", "chainId", "referenceId", "methodUsed", "calls" ] } ] } }, "example": { "status": 200, "msg": "success", "data": { "chainId": "1", "from": "0xa67e9b68c41b0f26184d64c26e0b2b81466e5994", "to": "0x8731d54E9D02c286767d56ac03e8037C07e01e98", "value": "337237525068648", "gas": "10000", "data": "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", "referenceId": "d1ef36652b6c427e9a96ef4d9e151b09" } } } } } } }, "x-bd-cu": "80", "x-bd-cu-type": "fixed", "x-internal": false } } }, "x-readme": { "explorer-enabled": true, "proxy-enabled": true } } ```