A chain your finance team can actually close the month with
Writing a transaction is the small part. Keeping an ERP, a payments processor, and an accounting ledger in agreement with a chain that finalizes on its own schedule is the part that takes engineering.
Chain projects rarely stall on chain: they stall at the seam
A chain is a database with unusual manners. It confirms in blocks rather than rows, it can rewrite the last few of them before they finalize, it charges for every write, and it has no idea your finance team closes the month on the fifth. None of that matters on its own. It matters the moment on-chain state has to agree with an ERP, a payments processor, and a ledger somebody signs off on. That seam is the work.
Villaex builds the layer between them: listeners that wait for finality rather than a block count, writes keyed on chain id, transaction hash, and log index, backfill by block range when a provider drops, and reconciliation against your ledger of record. Node providers rate limit, drop websockets, and time out on archive queries, so the recovery path is designed before the happy path is. The chain becomes one more system that behaves.
Finance won't accept a number that only exists in a block explorer, and support won't work from a wallet address with no customer attached. So we wire the chain into the systems those teams already live in, and keep the chain-specific detail out of their way. On-chain activity arrives as an order, an invoice, a payout, or a balance, with the hash attached for anyone who wants to check. Nobody learns a block explorer to do their job.
From input to outcome
What a chain project moves through before it holds value, and what has to be true at each boundary before the next stage can run.
Scope & chain
What the chain is actually for, then the chain, the standards and the custody model.
- In
- The problem
- Out
- An architecture
Contracts & tests
Contracts written against a specification, with invariants, fuzzing and gas profiling.
- In
- An architecture
- Out
- Tested contracts
Review & audit
Internal review and static analysis, then an external audit, with findings fixed and retested.
- In
- Tested contracts
- Out
- Audited contracts
Mainnet & monitoring
Testnet rehearsal, verified deploy, then alerting on balances, privileged calls and indexer lag.
- In
- Audited contracts
- Out
- A system you can operate
Feedback edge
What monitoring catches on chain, and what support hears off it, feeds the next change and the next audit scope.
What we build and deliver
The plumbing that makes on-chain data usable.
Event Listeners & Indexing
Subscriptions, block-range backfill, and subgraphs that survive a reorg.
Idempotent Sync
Writes keyed on chain, transaction hash, and log index, so replays never double-post.
ERP & CRM Connectors
On-chain activity landing in the systems your teams already use.
Reconciliation & Alerting
Scheduled comparison of chain state against your ledger of record.
Custody & Signing
Hardware-backed signers, multisig, and approvals on anything that moves value.
Nodes & Providers
Redundant providers with a self-hosted fallback for when the primary drops.
Rate Limits & Cost
Rate limit budgeting and cost control across provider spend, archive queries, and gas on writes.
Where it creates value
Integration wherever on-chain activity has to reach an off-chain system.
Accounting sync
On-chain settlements posted as journal entries with the hash attached.
Stablecoin settlement
Incoming transfers are matched to open invoices as they land. Goods release once the transfer is confirmed.
Escrow and payouts
Contract state drives order status and refunds off chain. Seller payouts run from the same escrow state.
Wallet state in your own tools
Multisig balances and pending approvals surface in internal dashboards. On the support side, wallet addresses resolve to customer accounts. Agents answer questions without anyone opening a block explorer.
Custody handoffs
Chain events mirrored into the warehouse system as ordinary stock movements.
The return on the work
What a properly wired chain returns.
- 1
- Ledger of recordOne reconciled view instead of a block explorer and a spreadsheet, compared against the chain on a schedule so a discrepancy surfaces the day it appears.
- 0
- Double-posted eventsIdempotent writes make replays and restarts harmless by design.
- Continuous
- Chain monitoringAlerts on stalled listeners, reorgs, provider failures, and indexer lag.
Questions we get before we start
Still unresolved? A 30-minute conversation with an engineer usually settles it faster than another page of copy.
Often not, and we'll say so. A chain earns its place when more than one party has to verify the same record without trusting each other, or when the asset itself has to be transferable. If what you want is an audit trail your own team controls, a database with append-only history is cheaper and easier to run.
Yes. On-chain events become the same kind of input your ERP already accepts: an API call, a queued message, a webhook, or a file. The chain-specific work stays on our side of the boundary, and the ERP sees ordinary records with a transaction hash attached for anyone who wants to verify.
Yes, and that's the common case. We read the deployed ABI, index history from the deployment block forward, and build the off-chain side around what the contract actually emits. If the events you need were never emitted, we'll say so early, because that's a contract change and it belongs in a different conversation.
Upgrades break listeners quietly. A proxy points at new logic, an event signature changes, and the indexer keeps running while it stops seeing half of what it used to. We version the ABI alongside the deployment, alert on unknown event topics, and re-backfill the affected block range after a redeploy so history stays complete.
EVM chains are the default: Ethereum, Base, Arbitrum, Optimism, and Polygon, where finality tags and log indexes work the same way. Solana needs a different design, since it has commitment levels and slots rather than confirmations and logs. Recurring cost is node provider spend, archive queries, and gas on writes, and we budget all three up front.
You do, and we build so it stays true. Signing sits behind a hardware-backed signer or a managed custody service, and anything that moves value requires multisig approval. A production key pasted into an environment variable on a shared host isn't a custody model. It's an incident waiting for a date. We're not a custodian and don't want to be.
Adjacent capabilities
Wire the chain in properly.
Tell us which systems have to agree with the chain. We'll build the listeners, the reconciliation, and the monitoring that keep them agreeing.