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Base mainnet

Use these proxy addresses for the WETH-USDC integration: Use the read ABI with the curve book proxy and the swap ABI with the entrypoint proxy. Implementation contracts are not routing or approval targets.

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Discover and verify the contracts

Configure the proxy addresses above and check the following on Base: Discover pairs from the curve book’s PairListed(base, quote) event, emitted once per base by its first shape update. The listing-event upgrade at Base block 51696183 emitted it once for WETH; before that block, a base’s first CurveUpdated event is its listing. Listing is persistent, so a nonzero qUnit or a PairListed event alone is not evidence of a currently executable curve. Check freshness and quote the amount you intend to trade.

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Before enabling a route

Confirm the published chain and proxy addresses, read the linked contracts, and simulate a funded swap from the actual payer with the required approval. Check both trade directions, receipt decoding, stale-curve handling, and the maximum amounts your router will send. Measure gas on the target deployment; development measurements are not production gas limits. See Quoting and swapping for the exact ABI and transaction flow.