Chainlink

AsiliChain uses Chainlink AggregatorV3 price feeds on Mantle for two purposes: coffee commodity price for BatchToken collateral valuation, and drought/weather risk signals for LendingVault risk parameters.

Price Feed: Coffee/USD

LendingVault reads the Chainlink coffee price feed when calculating loan amounts against BatchToken collateral.

// In LendingVault.sol
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

AggregatorV3Interface internal coffeePriceFeed;

constructor(address _coffeePriceFeedAddress) {
    coffeePriceFeed = AggregatorV3Interface(_coffeePriceFeedAddress);
}

function getCoffeePriceUsdc() public view returns (uint256) {
    (, int256 price, , uint256 updatedAt, ) = coffeePriceFeed.latestRoundData();
    require(block.timestamp - updatedAt < 3600, "Stale price feed");
    require(price > 0, "Invalid price");
    return uint256(price); // 8 decimals
}

Feed address on Mantle mainnet: Confirm at https://docs.chain.link/data-feeds/price-feeds/addresses?network=mantle before deployment. If Coffee/USD is not yet live on Mantle, use Alchemy price API as fallback with TWAP smoothing.

Fallback: If Chainlink feed is unavailable or stale (> 1 hour), LendingVault pauses new loan origination. Existing loans are unaffected. Alert fires to cooperative dashboard.

Collateral Valuation Formula

// Simplified TypeScript representation (matches on-chain logic)
function calculateLoanAmount(batch: BatchData, stage: TraceStage): bigint {
  const coffeePriceUsdc = getCoffeePriceUsdc(); // from Chainlink, 8 decimals
  const gradeMultiplier = GRADE_MULTIPLIERS[batch.grade]; // 85–115 BPS
  const stageMultiplier = STAGE_LTV[stage]; // 60–80 BPS

  const batchValueUsdc = (
    BigInt(batch.weightKg) * coffeePriceUsdc * BigInt(gradeMultiplier)
  ) / BigInt(100);

  const maxLoan = (batchValueUsdc * BigInt(stageMultiplier)) / BigInt(100);
  return maxLoan;
}

Drought / Weather Risk Feed

For pre-harvest GrowingCropToken loans, LendingVault reads a weather risk signal. This is used to:

• Adjust LTV dynamically during drought conditions (reduces from 65% → 40%)
• Trigger cooperative notifications when drought risk exceeds threshold
• Activate LendingVault forbearance pre-emptively for at-risk batches

Implementation: Chainlink Any API (if suitable feed exists) or Alchemy Notify + OpenWeatherMap API with on-chain relay. Exact feed configuration to be determined during Phase 1 development based on available Mantle data feeds at launch.

Eliminating CCIP

An earlier AsiliChain architecture used Chainlink CCIP to bridge tokens between Celo and Mantle. This is no longer part of the architecture.

The single-chain Mantle design eliminates all cross-chain complexity:

• No CCIP fee overhead (~$0.50 per bridge transaction)
• No 20-minute CCIP settlement delay
• No bridge failure modes
• BatchToken and LendingVault are on the same chain — direct reads, no bridging

CCIP documentation from earlier iterations should be disregarded. All contracts are deployed on Mantle only.