Contracts

On-chain contracts and addresses used by Parley Protocol.

ERC-8004 AgentRegistry

The AgentRegistry contract stores agent identities and reputation scores on Base Sepolia. Parley Protocol reads reputation scores before each negotiation to apply price adjustments.

Field	Value
Address	0xb0088D1300E10CF5AAC0d21c9d434885dCE2D305
Network	Base Sepolia (chain ID 84532)
Explorer	sepolia.basescan.org/address/0xb0088D1300E10CF5AAC0d21c9d434885dCE2D305

ABI

// Register your agent
function register(string agentName) external returns (uint256 agentId)

// Read reputation score (view — no gas)
function getReputation(address agent)
  external view
  returns (uint256 score, uint256 totalDeals, bool exists)

// Update reputation after a deal (called by protocol)
function updateReputation(address agent, bool dealSuccess) external

Reading Reputation with viem

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

const client = createPublicClient({ chain: baseSepolia, transport: http() });

const [score, totalDeals, exists] = await client.readContract({
  address: '0xb0088D1300E10CF5AAC0d21c9d434885dCE2D305',
  abi: parseAbi([
    'function getReputation(address agent) external view returns (uint256 score, uint256 totalDeals, bool exists)',
  ]),
  functionName: 'getReputation',
  args: ['0xYourAgentWallet'],
});

console.log(`Score: ${score}/100, Deals: ${totalDeals}, Registered: ${exists}`);

Reputation Score Effects

Score	Price Adjustment	Description
≥ 80	−20%	Trusted agent, significant discount
≥ 60	−10%	Good reputation, moderate discount
40 – 59	0%	Neutral — base price applies
< 40	+10%	Low reputation — premium charged
Not registered	0%	Treated as neutral

USDC on Base Sepolia

All payments are settled in USDC on Base Sepolia via EIP-3009 TransferWithAuthorization.

Field	Value
Address	0x036CbD53842c5426634e7929541eC2318f3dCF7e
Name	USDC
Symbol	USDC
Decimals	6 (1 USDC = 1,000,000 units)
EIP-712 domain name	"USDC"
EIP-712 domain version	"2"
Explorer	sepolia.basescan.org/token/0x036CbD...

Warning

The EIP-712 domain name must be exactly "USDC" (not "USD Coin") and version must be "2". Using wrong values causes invalid_exact_evm_token_name_mismatch.

x402 Facilitator

Field	Value
URL	https://x402.org/facilitator
Version	x402 v1
Scheme	exact
Supported networks	base-sepolia, base

// Server-side verify + settle
import { useFacilitator } from 'x402/verify';

const { verify, settle } = useFacilitator({ url: 'https://x402.org/facilitator' });

const { isValid } = await verify(paymentPayload, paymentRequirements);
const { success, transaction } = await settle(paymentPayload, paymentRequirements);
// transaction = on-chain tx hash

On-chain Proof

Event	Transaction
Example x402 USDC settlement	0xde3dbeefa8b0caed96d39327ec8479051a258b63168a0d9986ebedcf8af8bde6
Agent self-custody transfer	0x0e0957843d83b929cc6cebd2d1205a05e9dd865479d79026458a726c5c1a732e

AgentRegistry on Basescan: sepolia.basescan.org/address/0xb0088D1300E10CF5AAC0d21c9d434885dCE2D305
USDC on Basescan: sepolia.basescan.org/token/0x036CbD53842c5426634e7929541eC2318f3dCF7e
Example payment tx: sepolia.basescan.org/tx/0xde3dbeef...