Crate fynd_client 

Rust client for the Fynd DEX router.

fynd-client lets you request swap quotes, build signable transaction payloads, and broadcast signed orders through the Fynd RPC API — all from a single typed interface.

Constructing a client

Use FyndClientBuilder to configure and build a FyndClient:

let client = FyndClientBuilder::new(
    "https://rpc.fynd.exchange",
    "https://mainnet.infura.io/v3/YOUR_KEY",
)
.build()
.await?;

Minimal quote example

let weth: Bytes = Bytes::copy_from_slice(&[0xC0; 20]); // placeholder
let usdc: Bytes = Bytes::copy_from_slice(&[0xA0; 20]); // placeholder
let sender: Bytes = Bytes::copy_from_slice(&[0xd8; 20]); // placeholder

let order = Order::new(
    weth,
    usdc,
    BigUint::from(1_000_000_000_000_000_000u64), // 1 WETH (18 decimals)
    OrderSide::Sell,
    sender,
    None,
);

let quote = client
    .quote(QuoteParams::new(order, QuoteOptions::default()))
    .await?;

println!("amount out: {}", quote.amount_out());

Structs

ApprovalParams

Parameters for FyndClient::approval.

ApprovalPayload

An unsigned EIP-1559 approve(spender, amount) transaction.

BlockInfo

Ethereum block at which a quote was computed.

ClientFeeParams

Client fee configuration for the Tycho Router.

EncodingOptions

Options that instruct the server to return ABI-encoded calldata in the quote response.

ExecutionOptions

Options controlling the behaviour of FyndClient::execute_swap.

FeeBreakdown

Breakdown of fees applied to the swap output by the on-chain FeeCalculator.

FyndClient

The main entry point for interacting with the Fynd DEX router.

FyndClientBuilder

Builder for FyndClient.

FyndPayload

A ready-to-sign EIP-1559 transaction produced by the Fynd execution path.

HealthStatus

Health information from the Fynd RPC server’s /v1/health endpoint.

InstanceInfo

Static metadata about this Fynd instance, returned by GET /v1/info.

MinedTx

The result of a successfully mined transaction (non-swap).

Order

A single swap intent submitted to the Fynd solver.

PermitDetails

Per-token details for a Permit2 single-token authorization.

PermitSingle

A single Permit2 authorization, covering one token for one spender.

Quote

The solver’s response for a single order.

QuoteOptions

Optional parameters that tune solving behaviour for a QuoteParams request.

QuoteParams

All inputs needed to call FyndClient::quote.

RetryConfig

Controls how FyndClient::quote retries transient failures.

Route

An ordered sequence of swaps that together execute a complete token swap.

SettledOrder

The result of a successfully mined or simulated swap transaction.

SignedApproval

An ApprovalPayload paired with its cryptographic signature.

SignedSwap

A SwapPayload paired with its cryptographic signature.

SigningHints

Optional hints to override auto-resolved transaction parameters.

StorageOverrides

Per-account EVM storage slot overrides for dry-run simulations.

Swap

A single atomic swap on one liquidity pool within a Route.

Transaction

An encoded EVM transaction returned by the server when EncodingOptions was set.

Enums

BackendKind

Which backend solver produced a given order quote.

ErrorCode

A structured error code returned by the Fynd RPC API.

ExecutionReceipt

A future that resolves once the swap transaction is mined and settled.

FyndError

Errors that can be returned by FyndClient methods.

OrderSide

The direction of a swap order.

QuoteStatus

High-level status of a single-order quote returned by the solver.

SwapPayload

A payload that needs to be signed before a swap can be executed.

TxReceipt

A future that resolves once a submitted transaction is mined.

UserTransferType

Token transfer method used when building an on-chain swap transaction.