Fibrous DEX Aggregator

Overview

Fibrous is a DEX aggregator on Starknet that finds optimal swap routes across multiple liquidity sources. StarkFi uses Fibrous for all swap operations — single trades, multi-swaps, and batch operations.

How StarkFi Uses Fibrous

Feature	Fibrous API	StarkFi Command
Single Swap	`getRoute()` → `getCalldata()`	`trade`
Multi-Swap	`getRouteBatch()` → `getCalldataBatch()`	`multi-swap`
Batch Swap	`getRoute()` per pair	`batch --swap`
USD Pricing	`getRoute()` price field	`balance`, `portfolio`
Health Check	`checkFibrousHealth()`	`status`

API Endpoints

Endpoint	Function	Purpose
`GET /route`	`getRoute()`	Get swap route + expected output for a single pair
`GET /calldata`	`getCalldata()`	Get executable calldata with slippage protection
`GET /routeBatch`	`getRouteBatch()`	Batch routing for up to 3 pairs (same destination token)
`GET /healthCheck`	`checkFibrousHealth()`	API health and availability status

Base URL: https://api.fibrous.finance/starknet

Configuration

Setting	Value
Base URL	`https://api.fibrous.finance/starknet`
Router Contract	`0x00f6f4CF62E...FDf5a`
Default Slippage	1%
Max Batch Pairs	3

How Routing Works

Single Swap

1. getRoute(tokenIn, tokenOut, amount)    →  Find optimal route + expected output
2. getCalldata(tokenIn, tokenOut, amount) →  Generate executable calldata with slippage
3. Execute via TxBuilder:  approve → swap

Multi-Swap (Batch)

When all pairs share the same output token, Fibrous uses the native routeBatch endpoint for more efficient routing. Otherwise, StarkFi falls back to parallel individual getRoute() calls:

1. getRouteBatch(pairs)       →  Get routes for 2-3 pairs simultaneously
2. getCalldataBatch(pairs)    →  Generate calldata for each pair
3. Execute via TxBuilder:  approve₁ → swap₁ → approve₂ → swap₂ → ...

USD Pricing

StarkFi uses Fibrous route data for real-time USD price estimation. This powers the balance, portfolio, and lend-status commands:

Route 1 unit of the target token → USDC
Read the inputToken.price from the route response
USDC and USDT short-circuit to $1.00 (no API call needed)

Error Handling

Error	Cause	Resolution
`NO_ROUTE_FOUND`	No liquidity path exists	Try a different token pair or smaller amount
`BATCH_LIMIT_EXCEEDED`	More than 3 pairs in multi-swap	Split into multiple transactions
`NETWORK_ERROR`	Fibrous API unreachable	Check status with `starkfi status`, retry later

All requests use automatic retry with exponential backoff for transient network errors.

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