Skip to main content
A feed manifest is the blueprint Atria uses to understand a feed. It names the feed, points to the chain data you care about, and tells the runtime which files to execute. Here is an example manifest from the public Atria library: EVM ERC-20 Transfers. The manifest definition includes manifest.json, a filter template filter.js.hbs, and a filter-config.json that defines filter parameters. 
{
  "name": "EVM ERC-20 Transfers",
  "version": "1.0.1",
  "description": "Filter token transactions - configure minimum/maximum values & track specific ERC-20 transfers",
  "author": "Pulsy Atria Team",
  "config": {
    "source": {
      "networkId": "ethereum-mainnet",
      "networkFamily": "EVM",
      "dataType": "BlockWithLogs",
      "startBlock": null,
      "endBlock": null
    },
    "runtime": {
      "errorHandling": "ContinueOnError",
      "filter": {
        "path": "filter.js.hbs",
        "config": "filter-config.json",
        "engine": "javascript"
      }
    },
    "destination": {
      "errorHandling": "ContinueOnError"
    }
  }
}
The companion files keep code and configuration together: filter.js.hbs: a Handlebars template for the JavaScript filter. Placeholders such as token address, sender/receiver, min/max amount, and decimals are filled before deployment. 
function main(stream) {
    const TOKEN_ADDRESS = {{#if TOKEN_ADDRESS}}"{{TOKEN_ADDRESS}}"{{else}}null{{/if}};
    const MIN_VALUE = {{#if MIN_VALUE}}{{MIN_VALUE}}{{else}}null{{/if}};
    const MAX_VALUE = {{#if MAX_VALUE}}{{MAX_VALUE}}{{else}}null{{/if}};
    const FROM_ADDRESS = {{#if FROM_ADDRESS}}"{{FROM_ADDRESS}}"{{else}}null{{/if}};
    const TO_ADDRESS = {{#if TO_ADDRESS}}"{{TO_ADDRESS}}"{{else}}null{{/if}};
    const DECIMALS = {{#if DECIMALS}}{{DECIMALS}}{{else}}null{{/if}};

    const iface = new ethers.Interface([{ name: 'Transfer', type: 'event', inputs: [
        { indexed: true, name: 'from', type: 'address' },
        { indexed: true, name: 'to', type: 'address' },
        { indexed: false, name: 'value', type: 'uint256' }
    ] }]);

    const topic = iface.getEvent('Transfer').topicHash;

    const erc20Transfers = (stream.logs || [])
        .filter(l => l.topics?.[0]?.toLowerCase() === topic)
        .map(log => {
            try {
                const { args } = iface.parseLog(log);
                return { hash: log.transactionHash, from: args.from, to: args.to, value: args.value.toString(), address: log.address };
            } catch { return null; }
        })
        .filter(t => {
            if (!t) return false;
            const value = BigInt(t.value);
            if (DECIMALS != null) {
                if (MIN_VALUE != null && value < ethers.parseUnits(MIN_VALUE.toString(), DECIMALS)) return false;
                if (MAX_VALUE != null && value > ethers.parseUnits(MAX_VALUE.toString(), DECIMALS)) return false;
            } else {
                if (MIN_VALUE != null && value < BigInt(MIN_VALUE)) return false;
                if (MAX_VALUE != null && value > BigInt(MAX_VALUE)) return false;
            }
            if (TOKEN_ADDRESS && t.address.toLowerCase() !== TOKEN_ADDRESS.toLowerCase()) return false;
            if (FROM_ADDRESS && t.from.toLowerCase() !== FROM_ADDRESS.toLowerCase()) return false;
            if (TO_ADDRESS && t.to.toLowerCase() !== TO_ADDRESS.toLowerCase()) return false;
            return true;
        });

    if (erc20Transfers.length === 0) return null;

    return { metadata: stream.metadata, count: erc20Transfers.length, transfers: erc20Transfers };
}
filter-config.json: the schema for those placeholders. It describes each setting, notes whether it is optional, and provides default values. 
{
  "FROM_ADDRESS": {
    "description": "If not specified, this filter is ignored",
    "optional": true,
    "value": null
  },
  "TO_ADDRESS": {
    "description": "If not specified, this filter is ignored",
    "optional": true,
    "value": null
  },
  "TOKEN_ADDRESS": {
    "description": "If not specified, this filter is ignored",
    "optional": true,
    "value": null
  },
  "MIN_VALUE": {
    "description": "Minimum transfer amount (ignored if not specified)",
    "optional": true,
    "value": null
  },
  "MAX_VALUE": {
    "description": "Maximum transfer amount (ignored if not specified)",
    "optional": true,
    "value": null
  },
  "DECIMALS": {
    "description": "Token decimals for auto-converting wei to human-readable format (Not specified = raw wei)",
    "optional": true,
    "value": null
  }
}