feat: add erc20-balance-of-pcape

src/strategies/erc20-balance-of-pcape/README.md

@@ -0,0 +1,13 @@
+# erc20-balance-of-pcape
+
+This is the most common strategy, it returns the balances of the voters for a specific ERC20 token.
+
+Here is an example of parameters:
+
+```json
+{
+  "address": "0x8383B691ffE89BA6915d2458648BDD515DE7202D",
+  "symbol": "pcAPE",
+  "decimals": 18
+}
+```

src/strategies/erc20-balance-of-pcape/examples.json

@@ -0,0 +1,48 @@
+[
+  {
+    "name": "pcAPE query",
+    "strategy": {
+      "name": "erc20-balance-of-pcape",
+      "params": {
+        "address": "0x8383B691ffE89BA6915d2458648BDD515DE7202D",
+        "symbol": "pcAPE",
+        "decimals": 18
+      }
+    },
+    "network": "1",
+    "addresses": [
+      "0xfec29ac8a954317e4c27449506db469e20119d24",
+      "0xcc026bd03311c37f11900ca4f552e7f733a5e022",
+      "0x8f26d3c449e4685c9b472a80514f12e8bb497837",
+      "0xf4a89c75ee829926c492fee034a5a8236a757598",
+      "0x50c0946a0562d3f9dd63d34199889d7fc2ef4974",
+      "0x3538480926dc87947756091fa9d5d550f3bcda7b",
+      "0xb5a07049e03e7a2f016f52e146fc6beea7e321f5",
+      "0xc7a26ca791d2b9448ed33889f861eb849cea0c8c",
+      "0xf7598c34cd39a2bfea3865d711d9301450113bc3",
+      "0x66a2fdc7b9a0d16913dfb1d779bc61ea4d39e60a",
+      "0x4f690b3b2c9316be7bb0355045819809764178e4",
+      "0x83ede5881f280aacb5c863cefb53771fd7e4f4d9",
+      "0x4496678922007c367504d50b16d6a7cdf303c7d1",
+      "0xb913251da5371b8d641e7ad084777aaf737a4170",
+      "0xbdea17fef43b51df3f62bfb968ad350a35cf041a",
+      "0xfd9f0bf2a0236e998ab2524a19ab34b64ea52eab",
+      "0x8b1f70a60f402652d857abec7f86ee510a5472df",
+      "0xdc2b2ce1396a32acca5886f1cbce04556176b01b",
+      "0xc776a6ae36f5db33ee47923ff6c0949938903e4d",
+      "0x3dc57748b1375907cbb7a8cf9210cd2a4a577b7b",
+      "0x5c1ca6ac33800f6f88e3c46099271b304ca6f366",
+      "0x350eb0576d8d1fece46259fb2ca91a99853ad15e",
+      "0xd0d4f4faa1404a7604aa0a34bfb27f5bc8ee4a38",
+      "0xd74170150175fae8161140f1f16cf3099899e0e5",
+      "0x243f07a74efe77bec4f1a5eb3e542d2783755b8d",
+      "0x9327f858ee0f65f275d46794152e5d8d1ea8bbee",
+      "0xa33f323009d006b2d2edd55e773ae1125dfa32fd",
+      "0x42b823865349e67a145037f904057c0c3bfa07ff",
+      "0x499822a60f18cf1692fb328907ed0b7d46c48d0f",
+      "0x8b3b2f3e62268c6d2226fbee94adb36e056a9e62",
+      "0x260643d41d1dffebfc8c79a28c79e1c22d913c4c"
+    ],
+    "snapshot": 18174560
+  }
+]

src/strategies/erc20-balance-of-pcape/index.ts

@@ -0,0 +1,34 @@
+import { BigNumberish } from '@ethersproject/bignumber';
+import { formatUnits } from '@ethersproject/units';
+import { Multicaller } from '../../utils';
+
+export const author = 'gopherj';
+export const version = '0.1.1';
+
+const abi = [
+  'function balanceOf(address account) external view returns (uint256)'
+];
+
+export async function strategy(
+  space,
+  network,
+  provider,
+  addresses,
+  options,
+  snapshot
+): Promise<Record<string, number>> {
+  const blockTag = typeof snapshot === 'number' ? snapshot : 'latest';
+
+  const multi = new Multicaller(network, provider, abi, { blockTag });
+  addresses.forEach((address) =>
+    multi.call(address, options.address, 'balanceOf', [address])
+  );
+  const result: Record<string, BigNumberish> = await multi.execute();
+
+  return Object.fromEntries(
+    Object.entries(result).map(([address, balance]) => [
+      address,
+      parseFloat(formatUnits(balance, options.decimals))
+    ])
+  );
+}

src/strategies/erc20-balance-of-pcape/schema.json

@@ -0,0 +1,33 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$ref": "#/definitions/Strategy",
+  "definitions": {
+    "Strategy": {
+      "title": "Strategy",
+      "type": "object",
+      "properties": {
+        "symbol": {
+          "type": "string",
+          "title": "Symbol",
+          "examples": ["e.g. pcAPE"],
+          "maxLength": 16
+        },
+        "address": {
+          "type": "string",
+          "title": "Contract address",
+          "examples": ["e.g. 0x8383B691ffE89BA6915d2458648BDD515DE7202D"],
+          "pattern": "^0x[a-fA-F0-9]{40}$",
+          "minLength": 42,
+          "maxLength": 42
+        },
+        "decimals": {
+          "type": "number",
+          "title": "Decimals",
+          "examples": ["e.g. 18"]
+        }
+      },
+      "required": ["address", "decimals"],
+      "additionalProperties": false
+    }
+  }
+}