In some verifications, we use api third-party api to verify the user's address. (Ex. Etherscan API, graph protocol API, Opensea.)
- Swap Count on Uniswap (Etherscan API)
We set up a simple verification system in the form of AWS CDK. If you are interested, please check it out.
In the case of Uniswap V2, we use graph protocol API and check whether user swap befero 1380481 or not.
import axios from "axios";
import { getProviderForNetwork } from "../../helpers/phiUtils";
/* -------------------------------- NETWORK -------------------------------- */
// number of the block you want to get timestamp of
const NETWORK = "homestead";
const blockNumber = 13804681;
/* ------------------------------------------------------------------------- */
type Swap = {
id: number;
timestamp: number;
sender: string;
};
type APIResponse = {
data: {
swaps: Swap[];
};
};
/* ------------------------------------------------------------------------- */
const endpoint = "https://api.thegraph.com/subgraphs/name/uniswap/uniswap-v2";
/* ------------------------------------------------------------------------- */
let provider: any;
// value is condition of count
export async function verify(address: string, value: number): Promise<[boolean, number]> {
if (!provider) {
provider = await getProviderForNetwork(NETWORK);
}
const timestamp = (await provider.getBlock(blockNumber)).timestamp;
const query = `
query {
swaps (
where: {
timestamp_lte: "${timestamp}", to: "${address}"
}
) {
id
timestamp
to
}
}
`;
const result = await axios.post<APIResponse>(endpoint, { query });
const swapsLength = result.data.data.swaps.length;
//if true, user get coupon
if (swapsLength >= value) {
return [true, swapsLength];
} else {
return [false, swapsLength];
}
}
In the case of Snaphot, we use snapshot graph api and check count of votes.
const endpoint = "https://hub.snapshot.org/graphql";
const query = `
query Votes {
votes (
first: ${value}
skip: 0
where: {
voter: "${address}"
}
) {
id
voter
}
}
`;
const result = await retryableApiPost<APIResponse>(endpoint, { query });
counter = result.data.votes.length;
// if true, user get coupon
if (counter >= value) {
return [true, counter];
} else {
return [false, counter];
}
