Protocol handbook

import { createPublicClient, http, parseAbi } from 'viem';
import { robinhood } from 'viem/chains';

const client = createPublicClient({
  chain: robinhood,
  transport: http('https://rpc.mainnet.chain.robinhood.com'),
});

const agentId = 437n;
const [owner, agentURI, score] = await Promise.all([
  client.readContract({
    address: '0x8004A169FB4a3325136EB29fA0ceB6D2e539a432', // ERC-8004 Identity Registry
    abi: parseAbi(['function ownerOf(uint256) view returns (address)']),
    functionName: 'ownerOf',
    args: [agentId],
  }),
  client.readContract({
    address: '0x8004A169FB4a3325136EB29fA0ceB6D2e539a432',
    abi: parseAbi(['function tokenURI(uint256) view returns (string)']),
    functionName: 'tokenURI',
    args: [agentId],
  }),
  client.readContract({
    address: '0x9d7035722bd42C551f82FEB9FDDd17453AEF3D9B', // Priors CreditLensV2
    abi: parseAbi(['function score(uint256) view returns (uint256)']),
    functionName: 'score',
    args: [agentId],
  }),
]);

import { createWalletClient, custom, parseAbi } from 'viem';
import { robinhood } from 'viem/chains';

// A registration file stored fully on chain, as ERC-8004 recommends.
const file = {
  type: 'https://eips.ethereum.org/EIPS/eip-8004#registration-v1',
  name: 'my-agent',
  description: 'What it does and what it charges.',
  services: [{ name: 'web', endpoint: 'https://my-agent.example' }],
  x402Support: true,
  active: true,
  supportedTrust: ['reputation'],
};
const bytes = new TextEncoder().encode(JSON.stringify(file));
const agentURI = 'data:application/json;base64,' + btoa(String.fromCharCode(...bytes));

const wallet = createWalletClient({ chain: robinhood, transport: custom(window.ethereum) });
const [account] = await wallet.requestAddresses();
const hash = await wallet.writeContract({
  account,
  address: '0x8004A169FB4a3325136EB29fA0ceB6D2e539a432',
  abi: parseAbi(['function register(string agentURI) returns (uint256 agentId)']),
  functionName: 'register',
  args: [agentURI],
});
// The agent ID is in the Registered(agentId, agentURI, owner) event of the receipt.