@yodlpay/payment-router

Find the cheapest swap/bridge route across multiple protocols and encode Yodl payment calls.

Installation

npm install @yodlpay/payment-router

Peer dependencies: viem and typescript.

Usage

import { getTokenBySymbol } from "@yodlpay/tokenlists";
import { preparePayment } from "@yodlpay/payment-router";
import { base } from "viem/chains";

const payment = await preparePayment(
  {
    fromToken: getTokenBySymbol("USDC", base.id),
    toToken: getTokenBySymbol("USDT", base.id),
    amount: "10",
    receiver: "0x...",
  },
  "0x...", // sender address
);

// payment.calls    → BatchCall[] ready for UserOp
// payment.method   → "direct" | "swap" | "bridge"
// payment.protocol → "Relay" | "LI.FI" | "Across" | "Uniswap" | "direct"
// payment.fees     → FeeItem[] | undefined

Fee information

Every quote returns an itemized fee breakdown via fees?: FeeItem[] on both QuoteResult and PreparedPayment:

interface FeeItem {
  label: string;          // e.g. "Relayer gas", "LP fee", "Protocol fee"
  category: FeeCategory;  // "gas" | "relayer" | "lp" | "protocol" | "app"
  amount: string;         // raw token units
  token: Address;         // fee token address
  chainId: number;
  amountUsd?: string;     // USD equivalent (when available)
}

Protocols

| Protocol | Swap | Bridge | |----------|------|--------| | Relay | Yes | Yes | | LI.FI | Yes | Yes | | Across | No | Yes | | Uniswap | Yes | No |

Key concepts

• Stateless — no wallet, no signing, no tx submission. The SDK only does quoting + call encoding.
• BatchCall[] — the output format. Each call has { to, data, value } ready to batch into a UserOp.
• Protocol adapters — all implement the same ProtocolAdapter interface with getQuote() and buildCalls().

License

Business Source License 1.1