Deploy a verified API usage record per tenant that drives billing automatically, giving customers a transparent breakdown of their charges. The External Data Oracles, Invoices and Billing, and Audit Logs modules anchor verified usage as it is consumed, so customers see exactly what drove their bill and trust the calculation.
Turn disputed, platform-reported call volumes into a verified per-tenant record both sides can read.
01.
Anchor consumption as it happens. Each tenant's API calls are recorded on-chain as they are consumed, so billing rests on a tamper-evident record rather than an internal counter only the platform can see.
02.
Verify the numbers. External Data Oracles confirm usage before it is billed, so the volumes a tenant is charged for are independently established, not just asserted.
03.
Drive billing from usage. The Invoices and Billing module generates each invoice directly from the verified record, so charges follow consumption without manual reconciliation.
04.
Show tenants their bill's basis. Customers read the exact metered usage behind every charge, ending disputes that come from opaque, unverifiable totals.
05.
Keep a shared billing history. The Audit Logs module preserves usage and invoices together, giving platform and tenant one reconciled trail for any period.
06.
Resolve charges from evidence. Because usage is verified and visible, a contested invoice is settled against the shared record instead of conflicting internal reports.
Follow a tenant's API consumption from metered calls through verification to a transparent, automatically generated invoice.
08:20:05
[SYS] Initializing Tenant Usage Record...
08:20:05
[CMD] provisionTenant { id: "TEN_308", plan: "USAGE_TIER_2" }
08:20:06
[AUTH] Binding pricing terms and arming meter...
08:20:06
[OK] Tenant TEN_308 provisioned at block 17510233.
Cerulea decomposes multi-tenant billing into modular contracts. Each layer provisions tenants, meters usage, verifies totals, and invoices without the platform controlling an unauditable counter.
Verified usage billing is a horizontal capability. Here is how different platform actors put the settlement layer to work.
Bill usage-based plans from a per-tenant verified record, ending disputes over call volumes and letting customers see exactly what drove every charge.
Key Asset Types
Read the verified usage behind each invoice and reconcile charges against a shared ledger, replacing blind trust in a vendor's internal counter with direct evidence.
Key Asset Types
Recognize usage revenue from an immutable, auditable record and answer customer billing questions from one source, cutting reconciliation effort and revenue leakage.
Key Asset Types
Whether you are bridging existing API gateways and billing systems or metering usage directly at the edge, Cerulea routes both into one billing record.
For platforms on established API gateways and billing systems. Usage events are translated into on-chain verified records through the API gateway automatically.
API Gateway / Billing
Platform Systems
Cerulea API Gateway
Usage Verification
Cerulea Private Chain
Billing Ledger
For platforms metering at the edge. A signed collector reports verified per-tenant usage directly to the billing contract.
Edge Collector / Wallet
Metering Endpoints
Billing Validators
Usage Consensus
Cerulea Ledger
Usage & Invoice Record
Building a verified multi-tenant billing system with per-tenant metering, oracle verification, automatic invoicing, and a transparent audit window from scratch requires specialised engineers and careful billing integration. Calculate your exact deployment speed using Cerulea.
Traditional Deployment
Solidity Coding & Audits
~ 11 Months
Visual Compilation
WASM Logical Artifacts
~ 4 Weeks
The legacy timeline reflects API-gateway and billing integration benchmarks. Building per-tenant metering, oracle verification, automatic invoicing, and a customer-facing audit window for an average platform takes a baseline of 7 months. Building the same architecture on Cerulea takes a baseline of 2 weeks, because Cerulea Studio visually translates your metering and billing rules into pre-audited WebAssembly binaries and provisions the billing ledger and audit layer instantly.