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B11 - Cost Reconciliation

GroupTechnologyStatusServiceRoadmap phaseContracts
B - LLM management and Model GatewayDevelopedto developfinops6usage-event

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Role and responsibilities​

Reconciles estimated, measured and billed costs from provider invoices and exports.

Data model​

Tables (schema eai, every tenant table carries tenant_id uuid NOT NULL with an RLS policy on current_setting('app.tenant_id', true)::uuid): eai.usage_events, eai.price_cards, eai.fx_rates, eai.recon_imports, eai.audit_events.

API endpoints​

  • POST /v1/finops/reconciliation/imports
  • GET /v1/finops/reconciliation/imports
  • POST /v1/finops/reconciliation/run
  • GET /v1/finops/reconciliation/report
POST /v1/finops/reconciliation/imports HTTP/1.1
Host: <control-plane-host>
X-API-Key: eai_xxx_secret
Accept-Language: en
Content-Type: application/json

{"source": "generic_csv", "filename": "invoice-2025-05.csv", "mapping": {"date": "date", "amount": "cost", "provider": "provider", "model": "model", "currency": "currency"}, "content": "date,provider,model,cost,currency\n2025-05-01,openai,gpt-4o,12.50,USD\n2025-05-02,openai,gpt-4o,8.10,USD\n"}
{"id": "3a5d36bc-b8c9-491e-a829-c340e4ae749f", "source": "generic_csv", "provider": null, "filename": "invoice-2025-05.csv", "line_count": 2, "total": {"amount": "20.6", "currency": "USD"}, "period_start": "2025-05-01", "period_end": "2025-05-02", "created_at": "2026-10-30T02:38:04.108259+01:00"}

Errors use the common envelope {"error": {"code", "message", "message_i18n", "details", "request_id"}}; lists are paginated with limit and cursor.

SDK usage​

Python (enterprise_ai):

from enterprise_ai import EnterpriseAI

client = EnterpriseAI(base_url="<control-plane-url>", api_key="eai_xxx_secret")
items = client.finops.list_price_cards()

TypeScript (@enterprise-ai/sdk):

import { EnterpriseAI } from "@enterprise-ai/sdk";

const eai = new EnterpriseAI({ baseUrl: "<control-plane-url>", apiKey: process.env.EAI_API_KEY });
const items = await eai.finops.priceCards.list();

Java (enterprise-ai-java):

EnterpriseAIClient client = EnterpriseAIClient.builder()
    .baseUrl("<control-plane-url>")
    .apiKey(System.getenv("EAI_API_KEY"))
    .build();
var items = client.finops().listPriceCards();

Go (enterprise-ai-go):

client, _ := eai.NewClient(eai.WithBaseURL("<control-plane-url>"), eai.WithAPIKey(os.Getenv("EAI_API_KEY")))
items, err := client.FinOps.ListPriceCards(ctx)

Configuration​

  • Environment: EAI_DATABASE_URL, EAI_OTEL_EXPORTER_OTLP_ENDPOINT.
  • Helm values: controlPlane.enabled, controlPlane.replicas, controlPlane.resources, controlPlane.config.

Security controls​

  • Authentication by OIDC JWT, tenant API key with scopes, or SPIFFE mTLS; tenant resolved from the credential, never from the body.
  • Authorization through OpenFGA and OPA decisions; every mutation and decision writes a hash-chained eai.audit_events row.
  • Secrets never returned by the API; TLS everywhere; Cilium network policies restrict who can reach the service.

Observability​

  • Metrics: eai_cost_reconciliation_requests_total, eai_cost_reconciliation_errors_total, eai_cost_reconciliation_latency_seconds (Prometheus).
  • Traces: OpenTelemetry spans eai.finops.* with W3C traceparent propagation, AI spans forwarded to Opik.
  • Audit actions: finops.price_card.create, finops.price_card.retire, finops.reconciliation.run, policy.evaluate.

FinOps aspects​

Lifecycle: estimated (before call) -> measured (Usage Event) -> billed (provider invoice import: openai, anthropic, aws_cur, azure, gcp, generic_csv). The report shows variance and raises alerts above threshold.

Failure modes and resilience​

  • Stateless replicas behind the API Gateway, PostgreSQL HA for state; readiness probe GET /readyz removes unhealthy pods.
  • External system unavailable: fail closed for security decisions, explicit error code, no silent bypass.

Standalone adoption (client of a client)​

A client of a client can adopt this brick alone with the Python SDK sub-client client.finops (TS eai.finops, Java client.finops(), Go client.FinOps). Minimal deployment: Control Plane API + PostgreSQL + Keycloak (or API keys), the Control Plane loads every domain of services/control-plane/src/eai/domains; the optional chart components are switched off in deploy/helm/enterprise-ai/values.yaml (vllm.enabled, qdrant.enabled, nats.enabled, workers.enabled).

Acceptance tests​

  1. A tenant cannot read or modify another tenant's resources (RLS test).
  2. Every mutation produces an audit event verifiable by GET /v1/audit/verify.
  3. Errors are returned in English and French according to Accept-Language.

Unavailable costs (LLM_-011)​

A media cost without a known price stays unavailable: the estimate total is then null and complete: false, so the reconciliation never compares an invented zero with an invoice.