Spend sets behavior
Treasury sees every USDC an agent spends. TradeBot-Alpha burned through 95% of its monthly budget and triggered 3 critical alerts.
Agentic economy
USDC · x402
Next.js 16
TypeScript
Arc Suite for AI agents
Four production apps for the agentic economy on the USDC stablecoin: Treasury — agent treasury and budgets, Reputation — trust scoring, Marketplace — a storefront for paid APIs on the x402 protocol, and a shared landing page. I own product and UX/UI design: information architecture, the dark-theme design system, live dashboards, and the entire user journey — from the landing page to the settlement audit.
01 / product scale
Not a landing page about an idea, but a working economic operating system for agents
4
production apps on one domain: Treasury, Reputation, Marketplace, Landing.
15+
connected modules: Treasury, Reputation, Marketplace, Billing, Escrow, Shield, Gas, Wallet OS, Interop, Radar, and more.
1000
maximum agent trust score: a 0–1000 scale across 5 dimensions.
19.8M
API requests passed through the marketplace at an average uptime of 99.62%.
02 / concept
Three apps — one closed loop: spend → reputation → access
The agentic economy is software paying software with no human in the loop. An AI agent calls a paid API on its own, pays for it in USDC on its own, and is on its own accountable for the outcome. For that to be safe, three things are needed: spend control, measurable trust, and access gated by that trust. Arc Suite ties them together into a single enforcement loop.
Behavior sets trust
Reputation recalculates the score from transaction history. The same agent's trust score drops: −23 points over 30 days, tier Gold.
Trust unlocks access
Marketplace checks the score in real time. A premium API rejects the agent: score 812 below the required threshold of 850.
03 / agentic workflow
One autonomous API purchase — from policy to settlement proof
01 · identityAgent identity and intent
Every call starts with who the agent actually is and what it wants to buy. The agent's identity and its passport score are tied to its wallet.
- Three persistent agents live across all apps: DataHarvester-Pro, TradeBot-Alpha, IoT-Gateway-01.
- Each has a Circle wallet and a 0–1000 trust score.
02 · x402An x402 protocol offer
The API provider responds with an x402-style offer: price per request in USDC, the required minimum trust score, SLA terms.
- Pay-per-call pricing: from $0.0020 per request to $0.080 per minute of compute.
- No subscriptions or accounts — payment for exactly the call made.
03 · policyPolicy and compliance
Before payment, checks run: agent budget, limits, policy compliance, and the trust threshold required for this API.
- Auto-pause on overrun: monthly limit and daily cap.
- payment_denied when the score is below the threshold — with a clear explanation why.
04 · settleExecution and settlement on Arc
The Circle Wallet prepares execution, the payment goes out in USDC, settlement is recorded on Arc Testnet, and the provider signs a receipt.
- Arc Testnet network, Chain ID 5042002, USDC as gas.
- Signed provider receipt + settlement proof.
05 · proofProof and reputation update
The result comes together into a single audit view: policy, receipt, settlement evidence, and the score update — all on one page.
- Proof page: proof, receipt, and the policy chain in one window.
- A proof-archive registry and a reviewer mode for grant juries.
04 / platform
A single production surface: landing page, workflow, and settlement proof
05 / product 01
Arc Treasury — a treasury for teams deploying agents
💰 Treasury
Agent Budget Manager · B2B dashboard
A B2B dashboard for AI agent operators. Treasury gives full visibility and control over every USDC each agent spends: limits, daily caps, auto-pause on overrun, and a live transaction ticker. A product for finance and ops teams that need to manage a fleet of agents as a line-item expense.
$2.7KUSDC under management across all wallets, +12.4% for the week.
3 / 6active agents, the rest paused or idle.
$1.5Kspent this month out of a $4.4K budget — 35% used.
3active alerts: 2 critical, 1 warning.
- Real-time dashboard: a 7-day spend chart, breakdown by category, and a live transaction ticker.
- Per-agent budgets: monthly limits, daily caps, auto-pause on overrun.
- Critical alert system with Slack and webhook notifications.
- Transaction history fully categorized: API calls, swaps, compute, storage, bridge.
- Spend reports with CSV export.
- Agent onboarding with wallet creation via Circle Developer Controlled Wallets.
7 product sections
DashboardAgentsTransactionsBudgets & AlertsReportsSettingsMulti-network
Multi-network out of the box: Arc Testnet and Ethereum Sepolia switch in one interface.
06 / product 02
Arc Reputation — the trust oracle APIs use to decide whether to let an agent in
🛡️ Reputation
Agent Trust Layer · trust oracle
A trust oracle for AI agents. Every on-chain transaction, dispute, and response-time measurement rolls up into a 0–1000 score across five dimensions. APIs and services query this score in real time to gate access — no subscriptions, no manual verification. A product for anyone handing resources to agents who wants an objective "can this be trusted" metric.
720average trust score across the ecosystem, rising across every tier.
0–1000agent scoring scale across 5 dimensions.
5dimensions: payments, volume, response time, disputes, age.
991best score on the leaderboard (DataHarvester-Pro, Platinum).
- Live leaderboard with 7-day sparklines, tier badges, and search/filter.
- Score breakdown across 5 dimensions: Payment History, Volume Consistency, Response Time, Dispute Record, Account Age.
- payment_denied events — visible whenever an agent is blocked for low trust.
- Compare page: two agents side by side — metrics, sparklines, score breakdown.
- Tier system: Platinum → Gold → Silver → Bronze → New.
- Docs for developers: 5 API endpoints, 3 integration patterns, and a webhook reference.
# Full reputation profile GET /v1/agents/:id # Query up to 100 agents in a batch POST /v1/agents/batch # Score history over N days GET /v1/agents/:id/history # Top 100 on the leaderboard GET /v1/leaderboard # Subscribe to score events POST /v1/webhooks
LeaderboardAgentsAgent DetailCompareEventsTiersReportsDocsSettings
07 / product 03
Arc Marketplace — a storefront for APIs that get paid per call
🛒 Marketplace
x402 API Discovery
A storefront for APIs that accept payment via the x402 protocol — pay-per-request in USDC, no subscriptions or accounts. Built for the agentic economy, where software pays software autonomously. A product for providers who want to sell access per call, and for agents that need to find the right API and call it right away.
16+live APIs across 8 categories: Finance, AI/LLM, Data, Identity, and more.
8categories: from oracles and compute to storage and messaging.
99.62%average uptime across the storefront.
19.8Mtotal requests tracked on the cards.
- A catalog of 16+ APIs with full-text search and sorting by rating, volume, uptime, and price.
- 7-day sparklines of request volume on every card.
- A Featured section with editorially curated APIs.
- Detailed API pages: TypeScript snippets, reviews, SLA stats, and a pricing panel.
- Provider profiles with a trust score and portfolio.
- Analytics: volume by category, uptime comparison, top by rating; a page explaining the x402 protocol and a form for submitting your own API.
8 product sections
BrowseAPI DetailCategoriesProvidersProvider DetailAnalyticsx402Submit
Price range across the storefront: from $0.0020 per request to $0.080 per minute of compute; ratings from 4.5 to 4.9.
08 / technology
One shared design system and one technology layer across all four apps
Each app is a standalone Next.js 16 project, but all of them share a common design system: the Space Grotesk typeface, the Arc dark theme, the ArcButton, ArcProgress, StatCard, and PageHeader components, an EcosystemNav top navigation between apps, and a LiveTicker live ticker in every header.
| Layer | Technology |
|---|---|
| Framework | Next.js 16 — App Router, static export |
| Language | TypeScript 5 |
| Styling | Tailwind CSS v4 + shadcn/ui v4 |
| UI primitives | @base-ui/react |
| Charts | Recharts 3 |
| Icons | Lucide React |
| Fonts | Space Grotesk + Space Mono |
| Blockchain | Arc Testnet — Chain ID 5042002, USDC as gas |
| Payments | x402 protocol + Circle USDC |
| Wallets | @circle-fin/developer-controlled-wallets |
| Deploy | Vercel |
09 / release reliability
The final release v2026.07.19 — built, verified, and locked for grant review
0vulnerabilities: npm audit at moderate-and-above level.
31production monitor checks passed, 0 failures and 0 warnings.
19production smoke checks passed (+6 local API smoke tests).
4 / 4apps passed ESLint and a production Next.js build.
- A clean npm ci --install-strategy=hoisted install.
- The ArcEscrow Solidity contract compiled, 14 ABI entries.
- 4 unit regression tests passed.
- Baseline CSP on all four apps, including frame-ancestors 'none'; HSTS, clickjacking protection, MIME sniffing, and referrer policy all verified.
- The production monitor runs every 30 minutes via GitHub Actions, logs latency for every check, and can send alerts to Slack and Sentry.
10 / reviewer links
Live surfaces and source
11 / who it's for
Four audiences — from agent operators to grant juries
Arc Suite is designed around specific roles, each with its own entry point and its own scenario. The design task: make complex on-chain mechanics clear to each of them from the very first screen.
AI agent fleet operators
Paid API providers
x402 integration developers
Investors and Circle grant juries
Teams treating agents as a line-item expense
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