Arc X Agora

ArkAge is an agentic-commerce protocol: a trust layer where AI agents hire each other, pay in USDC, and judge each other's work autonomously on Arc, Circle's stablecoin L1, with no human in the loop.The full loop runs on-chain. One agent posts a job naming a provider and an evaluator and escrows USDC. The provider delivers, a third AI evaluates the result, and the chain settles payment while reputation accrues to each agent's on-chain identity. A keccak256 "reason thread" cryptographically links the evaluator's off-chain reasoning to both the on-chain settlement and the reputation record, so any verdict is verifiable end to end.Today, agent-to-agent transactions rely on brittle off-chain trust, with no shared reputation and no recourse. ArkAge is the missing layer: enforced economic rules and outcomes that are attributable on-chain.It is built on the full Circle Agent Stack: Modular Wallets for passkey-based builder identity, Agent Wallets (MPC) for agents, and Gateway for x402 nanopayments, with USDC as the single currency and gas token. The protocol weaves the ERC-8183 (agentic commerce) and ERC-8004 (identity and reputation) standards through one HookComposer.ArkAge is MCP-native: its primary consumer is an autonomous agent, not a human. 32 MCP tools let any AI runtime (Claude Code, Claude Desktop, Cursor) drive the protocol end to end, from registering an agent to posting, funding, and settling jobs.It ran autonomously for about three weeks in April and May 2026 and settled 487+ jobs on-chain, each with verifiable ERC-8004 reputation feedback, all viewable on Arcscan and the live demo.Stack: Solidity, Foundry, Next.js, TypeScript, Vercel Workflow, Circle Agent Stack, ERC-8183, ERC-8004, MCP. Built for the Agora Agents Hackathon 2026. Live: <a href="http://arkage-zeta.vercel.app" rel="noopener noreferrer nofollow" target="_blank">arkage-zeta.vercel.app</a>

Blockchain

Web3

Fullstack Development

ArkAge

ETHGlobal Cannes 2026

KronoScan is an AI-powered smart contract security auditor built on Circle Nanopayments and the x402 protocol on Arc, Circle's stablecoin L1. Autonomous agents scan Solidity contracts across 10 security categories, and each category is a separate sub-cent nanopayment, so you pay only for the checks you use. A full audit runs in under 60 seconds for a fraction of a cent.Smart contract audits are usually expensive, slow, and gatekept. KronoScan reframes them as on-demand, pay-per-use machine work. An agent deposits USDC into an on-chain escrow vault, runs the categories it needs (each an x402 micropayment), then closes the session, and unused budget is refunded automatically on-chain.The payment layer is real x402: the seller API returns 402 Payment Required with pricing terms, the buyer agent signs an EIP-3009 authorization via Circle's GatewayClient, and Circle batches the sub-cent settlements into a single on-chain transaction. On Arc, USDC is the native gas token, so agents hold one currency for both payments and gas.The on-chain side is StreamVault, a Solidity escrow contract with tiered pricing, identity-conditioned discounts, consumption tracking, top-ups, permissionless session timeout, and trustless auto-refund (28 Foundry tests). Service discovery runs through ENS: audit.kronoscan.eth resolves the seller and stores the API URL, pricing, categories, and payment protocol as text records (ENSIP-25 agent registry), so agents connect with zero hardcoded config and sellers update terms without redeploying.AI analysis uses category-specific DeepSeek prompts (reentrancy, access control, arithmetic, DeFi, and more), with a deterministic fallback.Stack: Solidity, Foundry, TypeScript, React, Vite, WebSocket, viem, Circle Nanopayments/x402, EIP-3009, ENS, DeepSeek. Built for ETHGlobal Cannes 2026.

KronoScan

ETHGlobal

StabL is a universal stablecoin payment gateway that lets merchants accept stablecoins from any chain and settle in the token and chain they prefer, built on Arc, Circle's stablecoin L1, for ETHGlobal HackMoney 2026.On-chain payments are usually too slow and too costly to feel like real checkout, and liquidity is fragmented across chains. StabL solves both with an intent-based design: a buyer expresses a payment intent, the merchant gets near-instant credit, and the actual on-chain settlement is decoupled and optimized in the background.The protocol is a three-contract architecture. PaymentPool holds funds and entry points, IntentVault captures and tracks payment intents, and BatchSettler groups settlements together to cut gas costs by 60 to 80% versus settling each payment individually. For the merchant experience, StabL integrates Yellow Network state channels so credit is confirmed off-chain in under a second, decoupled from on-chain finality, plus the <a href="http://Li.Fi" rel="noopener noreferrer nofollow" target="_blank">Li.Fi</a> SDK for real cross-chain routing quotes, so a payment made on one chain can settle to the merchant's preferred token on another. On Arc, USDC is the native gas token, which keeps settlement costs predictable and removes the second-token friction that breaks payment flows on other chains.Around the contracts sits a production-style TypeScript backend: Redis Streams for reliable event processing, PostgreSQL and Prisma for payment-lifecycle tracking, and WebSocket listeners for real-time on-chain events. The smart contracts are covered by a Foundry suite of 45+ unit tests and 10+ fuzz tests.Stack: Solidity, Foundry, TypeScript, Next.js, Redis, PostgreSQL, Prisma, Yellow Network, <a href="http://Li.Fi" rel="noopener noreferrer nofollow" target="_blank">Li.Fi</a> SDK, on Arc testnet. Built for ETHGlobal HackMoney 2026.

Martin BARRAL

Développeur Smart Contracts Solidity | Blockchain

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Expérience de travail

Développeur logiciels

Consultant service clients

Développeur logiciels

Mise en place d'un système de versioning

Formation

Cyfrin Updraft

EPSI - L'école d'ingénierie informatique

EPSI - L'école d'ingénierie informatique

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ArkAge

Arc X Agora

KronoScan

ETHGlobal Cannes 2026

StabL

ETHGlobal

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