Verified Agents.Settled Trust.One Registry on Arc.
ArcID is the identity and reputation layer for the agentic economy on Arc: every AI agent anchored to an ERC-8004 identity, every score earned from USDC that actually settled.
Why AI Agents Need Verified Identity
Agents already move money. What they can't do yet is prove who they are and how they've behaved.
Agents Can Transact, but Counterparties Need Proof
The gap isn't capability, it's assurance: a permanent, public identity that every counterparty can check before value moves.
Reputation Nobody Can Self-Issue
Feedback only counts from wallets that actually worked with the agent. Owners can't rate themselves, and nothing is ever edited away.
Scores Backed by Real Settlement
Trust is weighted by USDC that settled on Arc, in dollars, with sub-second finality. Claims don't count. Receipts do.
Agent Verification Built on an Open Standard
ArcID reads and writes the canonical ERC-8004 registries on Arc. No proprietary silo, no migration: any app that speaks the standard can verify your agent.
Identity Registry
"Who is this agent?" A permanent ERC-8004 identity owned by a real Arc wallet.
0x8004A8…94BD9eReputation Registry
"How has it performed?" Feedback from counterparties that transacted with it, public and permanent.
0x8004B6…388713Validation Registry
"Who vouches for its work?" Independent validators attest to results, on-chain.
0x8004Cb…EB4272How ArcID Works:
Identity, Reputation and Settlement
Three steps take an AI agent from anonymous to accountable.
Verified Identity
Register once and your agent gets a permanent ERC-8004 ID on Arc, owned by your wallet and readable by anyone.
Earned Reputation
Every completed job and settled payment adds evidence. Scores rise, decay and recover with real behaviour.
Screened Settlement
Before USDC moves, counterparties screen the agent over x402 for 0.001 USDC and get a clear answer.
Who ArcID Is For
Verify which agent you're dealing with and whether it has earned your trust.
AI Agent Developers
Give your agent a verifiable identity and a public track record without changing how it runs.
Register an agent →Marketplaces and Platforms
List only agents with a real on-chain history, and show buyers the evidence behind every score.
Browse the directory →Payment and Treasury Teams
Screen counterparties before releasing USDC, with one machine-payable call per check.
Read the trust screen docs →Protocols Adding Agent Trust
Read the same ERC-8004 registries from your own contracts. No SDK lock-in, no chain migration.
Explore the standard →Performance Built for the Agentic Age
Deterministic settlement, dollar-denominated fees and an identity registry that's already live.
Learn MoreDeveloper On-Ramp
Pick the tool that fits the job.
Identity Registry: register agents with a verifiable ERC-8004 identity, so verification is on-chain from day one.
MCP Server: give your agent ArcID lookups over MCP with the packages on npm (~arcusid), and declare MCP/A2A endpoints so others can call yours.
x402: charge per call over HTTP and settle in USDC, with the payer's identity checked first.
Reputation Registry: read feedback summaries straight from Arc to gate access, pricing or limits.
Trust Screen: one API call returns an agent's standing, machine-payable at 0.001 USDC per query.
FAQs About ArcID and AI Agents
ArcID is an identity and reputation layer for AI agents on Arc. It gives every agent a permanent ERC-8004 identity and a reputation built from settled USDC and counterparty feedback.
ERC-8004 is an open Ethereum standard for trustless agents. It defines three on-chain registries: Identity (who the agent is), Reputation (how it performed) and Validation (who attests to its work).
Arc is Circle's Layer-1 where USDC is the native gas token. Fees are predictable in dollars and finality is sub-second, which suits agents that pay each other constantly.
Only Arc gas, paid in USDC. On testnet a registration currently costs about 0.014 USDC. There is no ArcID token and no lock-up.
ArcID writes the registration file on-chain as a data URI together with the identity, so there's nothing to host and nothing that can disappear.
No. ERC-8004 blocks owners from leaving feedback on their own agents, and summaries are computed from specific client addresses to resist sybil attacks.
A single API call that returns an agent's standing before you transact. It's paid per query over x402 in USDC, so agents can screen other agents without accounts or API keys.