FAQ

In tutorial: <https://docs.alchemy.com/docs/how-to-build-a-token-swap-dapp-with-0x-api> I have not found how to add a commission on each transaction. It is possible to do this with using the 0x swap API endpoint?

Hi, is it possible to get the transactions for an individual NFT rather than a contract using getAssetTransfers. It does not seem to return a value for tokenId or erc721TokenId. This function seems to only return all transactions for a collection (contract).

Hi there, I've been using Alchemy to listen to events on a specific contract but after a couple of hours it dies and I don't see a way to at least be some kind of error or warning so I can reconnect. The code I'm using is the following: alchemy.ws.on( { method: AlchemySubscription.PENDING_TRANSACTIONS, // "alchemy_pendingTransactions", toAddress: contractAddress }, (res) => { }); Is there any way to do this? For instance, something like when we connect to the mempool through a node: const customWsProvider = new ethers.providers.WebSocketProvider(nodeUrl); customWsProvider._websocket.on("close", async (code) => { }); Thanks. Best regards, Hugo

Hi guys, I'm trying to listening to a contract event, but, when the event occurs, the e parameter result as undefined and I don't know how to get the parameters of the emitted event. Do you know how to handle it? Thanks :)

Hello, I recently tried to use the Alchemy GraphQL Webhooks service to listen to contract events. However, when attempting to create a webhook following the provided documentation, I encountered an error message stating that "GraphQL webhooks are currently in beta". I am very interested in using this service to achieve my desired functionality, but I am unsure about the beta status of the service. Can the Alchemy team provide more information about the beta status of this service, such as when it will be released as a stable version? Additionally, are there any workarounds or temporary solutions that would allow me to use the service in the meantime? If anyone else has encountered a similar issue or has any solutions, please leave a comment in the section below so we can discuss and help each other out. Thank you!