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feat: Arc infrastructure tools — USDC indexer, CCTP analytics, linter, subgraph, APS SDK#8

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feat/arc-infrastructure-tools
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feat: Arc infrastructure tools — USDC indexer, CCTP analytics, linter, subgraph, APS SDK#8
osr21 wants to merge 141 commits into
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feat/arc-infrastructure-tools

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@osr21 osr21 commented Jul 15, 2026 •
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Summary

Implements six Arc infrastructure tools documented in issue #7, plus a comprehensive audit and bug-fix pass across the bridge frontend and analytics dashboard.

Tools implemented

Tool A — USDC Transfer Indexer + REST API

A background worker inside the API server indexes all native USDC transfer events on Arc Testnet in real time via EIP-7708 logs from the native USDC emitter (0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE).

  • Indexes only native emitter logs (not the ERC-20 mirror) to avoid double-counting
  • Resumes from DB on restart; caps startup catch-up at 500 blocks; polls every 2 s (~4 Arc blocks per cycle)
  • REST: GET /api/indexer/transfers, GET /api/indexer/stats

Tool B — Transaction Memo Indexer

Indexes Memo events from Arc's on-chain memo contract (0x5294E9927c3306DcBaDb03fe70b92e01cCede505). Attempts UTF-8 decoding of memo payloads; stores decoded text alongside raw hex.

  • REST: GET /api/indexer/memos

Tool C — The Graph Subgraph

Graph Protocol subgraph (scripts/src/graph/) indexing the same events via decentralised infrastructure — alternative / complement to the centralised indexer.

Tool D — Contract Compatibility Linter

CLI linter (scripts/src/lint-arc-contract.ts) running 9 static checks against deployed bytecode for Arc Testnet compatibility issues (PUSH0, 2-immutable revert, ERC-7562 nonReentrant, CCTP V1 selector, etc.).

pnpm --filter @workspace/scripts run lint-contract <address>

Tool E — CCTP Bridge Analytics (indexer + dashboard)

Indexer: same worker indexes CCTP V2 DepositForBurn and MintAndWithdraw events with attestation status tracking (PENDING → COMPLETE).

Key CCTP V2 ABI facts confirmed from on-chain decoding:

  • DepositForBurn topic: 0x0c8c1cbdc5190613ebd485511d4e2812cfa45eecb79d845893331fedad5130a5
  • burnToken is the 1st indexed param on Arc (not nonce as in the Circle standard)
  • Arc adds uint32 minFinalityThreshold and bytes hookData params
  • MintAndWithdraw (not MessageReceived) is the correct event for indexing mints
  • minFinalityThreshold per chain: Arc=2000 (finalized), Sepolia/Base/Fuji=0 (fast testnet)

Dashboard (artifacts/arc-analytics/): React 19 + Vite + Recharts + shadcn/ui served at /arc-analytics/.

Route Purpose
/ Overview — last indexed block, event totals, CCTP domain breakdown bar charts (auto-refresh every 10 s)
/transfers Searchable/filterable USDC transfer explorer with pagination
/memos Memo event explorer — decoded text + raw hex tooltip
/bridge CCTP Burns tab (attestation status badges) + Mints tab

Tool G — APS SDK

TypeScript stubs for the Arc Privacy Sector (lib/arc-privacy-sdk/) — typed interfaces ready for integration when APS goes live.

Bug fixes and audit findings

Bridge frontend (artifacts/arc-bridge/)

  • CCTP V2 ABI corrected: switched from V1 4-param depositForBurn to V2 7-param — the V1 selector silently reverts on these contracts
  • Sepolia RPC: replaced unreliable rpc.sepolia.org with https://ethereum-sepolia-rpc.publicnode.com
  • Arc explorer URL: fixed dead URLs to https://testnet.arcscan.app
  • Attestation polling: extended timeout to 20 min; polling interval 5 s

Indexer RPC reliability

  • Replaced primary Arc RPC (rpc.testnet.arc.network) with https://arc-testnet.drpc.org — primary rate-limits both eth_getLogs (−32011) and basic requests
  • Set batchMaxCount: 1 on ethers.js provider — drpc.org free tier rejects JSON-RPC batches of >3 requests (error 31)
  • Capped getLogs history window at 9,000 blocks — drpc.org free tier rejects ranges >10,000 blocks (error 35)
  • Added isTicking guard + MAX_BLOCKS_PER_TICK = 100 cap to prevent overlapping poll ticks

Infrastructure

  • Database tables: usdc_transfers, memo_events, cctp_burns, cctp_mints, indexer_state
  • BigInt serialisation: drizzle mode:"bigint" columns serialised as strings via app.set("json replacer", ...)
  • Rate limiting: 60 req/min on /api/indexer/*; 10 req/min on heavy aggregate queries
  • OpenAPI / Orval codegen: spec updated for all 5 indexer endpoints; React Query hooks regenerated

Closes #7

metalimran added 30 commits May 23, 2026 15:29
Improve security and fix critical bugs in the bridge application
f9e18fa 
Fix SSRF vulnerabilities in the API, enhance wallet connection handling, update explorer links, and resolve precision issues with balance calculations.

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Add ability to resume interrupted cross-chain transfers and improve r…
ffc092a 
…eliability

Implement session persistence for interrupted bridge transfers, add RPC failover, and rate limiting to the API.

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Enhance contract security by implementing crucial fixes and upgrades
38bbcf1 
Implement security hardening for the FeeRouter contract, including immutable address configurations, reentrancy protection, and improved error handling, along with updated deployment scripts and ABIs.

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Update FeeRouter contract with enhanced security and functionality
277a833 
Upgrades FeeRouter to v3, introducing a slippage guard, two-step ownership transfer, emergency pause functionality, and residual approval reset. Deploys new contract addresses and updates ABIs and documentation.

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Make cross-chain transfers more reliable by handling contract errors
13e9dac 
Update FeeRouter contract to wrap the USDC approval reset in a try/catch block, ensuring transactions do not fail on networks with non-standard ERC-20 implementations like Arc Testnet. Addresses for all deployed networks have been updated.

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Revert FeeRouter to v2 contract and remove v3 features
b325e86 
Reverts FeeRouter contract to v2, removes v3-specific code from FeeRouterABI.ts and bridge.ts, and updates addresses in replit.md.

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Add workarounds for unreliable gas estimation on specific networks
6fba8bd 
Introduce gasLimitOverride to ChainConfig and apply it to Arc Testnet to bypass unreliable eth_estimateGas calls, ensuring successful transaction submissions.

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Adjust bridge contract to improve transaction reliability
7330a47 
Remove Arc Testnet from FeeRouter contract addresses and add gas overrides for certain write operations on Arc Testnet to bypass unreliable gas estimations.

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Remove fee router for direct cross-chain transfers
4809ddc 
Remove FeeRouterABI.ts and update bridge.ts to always use the direct CCTP path for cross-chain transfers, eliminating contract-to-contract USDC calls.

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Improve bridge functionality and error handling across chains
774220b 
Add gas overrides for minting on destination chains, enhance error messages for on-chain reverts and gas estimation failures, return a sentinel value for failed balance lookups, and make the Explorer link dynamic.

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Improve balance handling and error display for user transfers
e60b78d 
Update the UI to disable the MAX button when the balance is zero, display an insufficient balance warning, and prevent bridging with insufficient funds.

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Update screenshots related to cross-chain transfer functionality
78cd3cc 
Update screenshot of transaction details for cross-chain transfer testing.

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Fix critical bugs and improve user experience in the bridge
44f4f88 
Correctly handles CCTP V2 message nonces for replay protection, refactors attestation polling logic, validates fee recipient and burn transaction hash formats, and enhances custom recipient input validation.

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Update Arc Network documentation links and explorer URL
c663c7f 
Update Arc Testnet explorer URL in chains.ts to "https://testnet.arcscan.app", update the Arc Docs link in BridgePage.tsx to "https://docs.arc.network", and add a new GitHub link pill for the Arc Network repository.

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Improve transaction confirmation reliability during cross-chain trans…
405c18c 
…fers

Implement a robust transaction waiting mechanism that retries on network errors and falls back to direct RPC calls to ensure reliable confirmation of cross-chain mint transactions.

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Add FeeRouter v2 contract and verification screenshots
6f222cd 
Add FeeRouter v2 Solidity contract and screenshots related to contract verification attempts on ArcScan.

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Replit-Helium-Checkpoint-Created: true
Fix wallet chain switching and configure Arc native currency
ab54d9b 
Fixes bug where wallet chain switching fails on Arc Testnet by always using `wallet_addEthereumChain`. Configures Arc's native currency to ETH and adds a 30% gas price premium to all write transactions to prevent underpricing errors. Extends `waitWithRetry` to approve and fee transactions.

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Published your App
b2da847 
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Improve network switching by trying to switch first then adding
ef78284 
Refactor the `switchToChain` function to prioritize `wallet_switchEthereumChain` for existing networks and fall back to `wallet_addEthereumChain` for adding new ones, ensuring compatibility and reliability across different wallet behaviors.

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Published your App
3e4ee2f 
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@replit-agent
Published your App
002a81f 
Replit-Commit-Author: Deployment
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@replit-agent
Add security improvements and input validation to the bridge and refu…
583d7b3 
…el services

Implement rate limiting for gas refuel endpoints, validate JSON-RPC structure for bundler requests, add recipient validation in session loading, and validate addresses before encoding in gasless bridging.

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@replit-agent
Published your App
98b979d 
Replit-Commit-Author: Deployment
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@replit-agent
Improve bridge transaction reliability and user experience
a720c55 
Add a delay to chain switching to prevent MetaMask race conditions and introduce a recovery UI for minting failures.

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@replit-agent
Published your App
def3626 
Replit-Commit-Author: Deployment
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@replit-agent
Enhance security and error handling across the application
46d3499 
Implement security hardening measures, refine error handling for user-friendly messages, and improve relay protection against replay attacks.

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@replit-agent
Add API endpoint to provide contract details and ABIs
f1193f8 
Creates a new API route `/api/contracts` that serves contract ABIs, addresses, chain metadata, and compiler settings.

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@replit-agent
Update native currency symbol for Arc Testnet to USDC
238175b 
Correct the `nativeCurrency.symbol` in `artifacts/arc-bridge/src/lib/chains.ts` from "ETH" to "USDC" for the Arc Testnet configuration.

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@replit-agent
Improve smart contract security and update related configurations
8898e89 
This commit addresses security vulnerabilities in multiple smart contracts, including `FeeRouter`, `YieldVault`, `GasRelayer`, and `Paymaster`, by implementing fixes for reentrancy, ownership transfer, and token rescue mechanisms. It also regenerates the `contractData.ts` file with updated ABIs and pushes all changes to GitHub.

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@replit-agent
Update contract addresses and deployment scripts
08848bc 
Update contract addresses across multiple networks and chains, including Arc Testnet, Ethereum Sepolia, Base Sepolia, and Avalanche Fuji. This involves modifying deployment JSON files, chain configuration, contract data files, and documentation. Additionally, a new `deployAll.ts` script has been introduced to streamline the deployment process for all hardened contracts across all specified chains.

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@replit-agent
Published your App
2442db2 
Replit-Commit-Author: Deployment
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@replit-agent
Update contract addresses and improve transaction handling for security
98912fa 
Update GasRelayer and Paymaster addresses across multiple chains, fix replay key hashing, and add transaction status checks to prevent relaying reverted transactions.

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@replit-agent
Add new pages for ecosystem, developers, and portfolio tracking
537b005 
Adds new routes and components for the Ecosystem, Developers, and Portfolio pages, and updates navigation links in BridgePage. Also refactors README.md for clarity and adds Ethereum provider error handling for window.ethereum.

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@replit-agent
Published your App
30d2f48 
Replit-Commit-Author: Deployment
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@replit-agent
Add contribution guidelines for the relay bridge project
a797b15 
Add a CONTRIBUTING.md file detailing how to contribute, set up the project, add new chains, and notes on smart contract specifics.

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@replit-agent
Add screenshots of the Arc ecosystem directory and crosschain develop…
a8ffeb0 
…er tools

Add screenshots of the arc.io/ecosystem page, specifically highlighting the developer tools and crosschain categories.

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Replit-Helium-Checkpoint-Created: true
@replit-agent
Improve security and fix validation issues across the application
ee0545d 
Address front-running vulnerability in gas refuel, validate input lengths and formats for relay and session data, and correct scientific notation handling in the bridge page.

Replit-Commit-Author: Agent
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Replit-Helium-Checkpoint-Created: true
@replit-agent
Published your App
59ad65c 
Replit-Commit-Author: Deployment
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Replit-Helium-Checkpoint-Created: true
@replit-agent
Update screenshot showing transaction details
89ced34 
Add a new screenshot to the attached assets directory.

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Replit-Helium-Checkpoint-Created: true
@replit-agent
Update contract addresses and improve error handling for cross-chain …
8e06b7a 
…transfers

Updates stale contract addresses in the API and bridge libraries, enhances gas refuel liquidity checks, and adds validation for transaction hashes in session and history logs.

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@replit-agent
Published your App
dc577ca 
Replit-Commit-Author: Deployment
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@replit-agent
Improve gasless bridging by handling paymaster paused states and UI u…
f79edc3 
…pdates

Update `paymaster.ts` to return `paused` and `gasRate`, modify `gaslessBridge.ts` to fail fast if the paymaster is paused, enhance `bridge.ts` `friendlyError` to better surface rejection reasons (including paused state), and update `BridgePage.tsx` to track and display the `paused` state, block the bridge button when paused, and correctly hide the fee step in gasless mode.

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@replit-agent
Published your App
beb58bc 
Replit-Commit-Author: Deployment
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@replit-agent
Improve gasless bridging by ensuring adequate paymaster ETH deposits
704c044 
Add checks and UI elements to manage the Paymaster's ETH deposit in the EntryPoint for gasless bridging.

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@replit-agent
Update paymaster addresses for cross-chain gasless transactions
25cc9bd 
Corrected stale paymaster addresses in the fundPaymaster script for Arc Testnet, Sepolia, Base Sepolia, and Avalanche Fuji networks.

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@replit-agent
Improve error message for stuck cross-chain transfers
78c9459 
Update the attestation timeout error message to provide clearer user guidance, warn against retrying burns, and reference known Circle IRIS service issues.

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@replit-agent
Add Arc event indexer and analytics dashboard
a5ce01a 
Integrate an event indexer for USDC transfers and memo events, alongside the Arc Analytics dashboard.

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@replit-agent
Published your App
f751f5f 
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@replit-agent
Improve bridge reliability and fix analytics display bugs
f5ba966 
Enhance API input validation, increase attestation length limit, and refine pagination display logic in the bridge and analytics sections.

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@replit-agent
Update CCTP indexing to use drpc.org and respect rate limits
6047134 
Adjusted RPC endpoints to drpc.org, modified CCTP event indexing, and implemented rate limit handling for the Arc indexer.

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Arc Infrastructure Tools — Documentation Report (July 2026)

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@osr21 @replit-agent