Swap API integration: quote, approve, simulate, submit
Build a same-chain EVM swap flow with exact token amounts, correct approval targets, fresh quotes, transaction simulation and receipt tracking.
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Swap APIs & SDKs
Build quote, approval and swap flows from verified API documentation.
30 guides · Page 1 of 2
A 1inch Fusion order is not Classic swap calldata
Model 1inch Fusion as a signed order with resolver fills and keep its lifecycle separate from Classic wallet transactions.
A price quote is not always a transaction payload
Identify whether a response is an indicative price, a route for encoding, an executable transaction or a signed order.
Approval target versus transaction target
Resolve token spending permission separately from the transaction destination, especially for 0x v2 execution paths.
Attach a Permit2 signature to a 0x quote correctly
Construct the 0x Permit2 signature suffix once, preserve the original quote and bind signing to the selected account.
Audit a 0x v1 integration before switching to v2
Audit 0x v2 migration at request, response, allowance and transaction boundaries rather than changing only the endpoint URL.
Bound route search work in the PancakeSwap SDK
Bound PancakeSwap SDK route search using documented controls and measure the quality-versus-latency tradeoff in your own workload.
Build calldata for a PancakeSwap aggregator candidate
Turn a PancakeSwap agg candidate into calldata while preserving its route and revalidating recipient, slippage and funding.
Debug OKX DEX API request signatures
Construct OKX authentication from the exact timestamp, method, request path and serialized body sent over HTTP.
Diagnose 1inch swap estimation failures before changing parameters
Investigate 1inch estimation errors by preserving execution context and checking prerequisites before requesting a new payload.
Distinguish OKX DEX quote and swap responses
Parse OKX DEX quote data separately from the swap endpoint’s executable EVM transaction object.
Do not freeze a 0x Settler address in application code
Validate 0x execution destinations against documented deployments while keeping token allowance targets separate.
Give PancakeSwap Smart Router reliable pool inputs
Supply PancakeSwap local routing with coherent candidate pools, on-chain quoting and gas context before building calldata.
Handle liquidityAvailable false in 0x responses
Branch on liquidityAvailable before reading transaction fields and prevent an older quote from surviving an unavailable response.
Implement the 0x AllowanceHolder swap path
Implement the 0x AllowanceHolder sequence with validated v2 requests, spender resolution and transaction receipt tracking.
Keep KyberSwap route discovery and building separate
Pass a KyberSwap route summary intact from discovery to building and keep quote refreshes separate from executable payloads.
Keep KyberSwap route gas context consistent
Keep route-ranking gas assumptions separate from execution gas limits in a KyberSwap adapter.
Map native assets explicitly in an OKX DEX adapter
Translate native-asset identity at the OKX adapter boundary and validate native value independently from token approvals.
Match PancakeSwap router calldata to its deployment
Pair PancakeSwap calldata encoders with the correct router family, deployment and permission mechanism.
PancakeSwap API or SDK: choose where routing runs
Choose between PancakeSwap’s hosted quote interface and local SDK routing according to data ownership, operations and execution needs.