How Government Agencies Can Run APIs On-Prem or Air-Gapped Without Compromise

Government agencies live in a different threat and compliance landscape than commercial enterprises.

The data they handle — citizen records, law enforcement databases, intelligence assets, national infrastructure systems — is subject to data sovereignty laws, security classifications, and audit requirements that most commercial API gateways are not designed to meet.

The default answer from most API gateway vendors is a cloud-hosted control plane with a self-hosted data plane. That architecture, regardless of how it is marketed, puts policy management and configuration outside the agency's boundary. For many government use cases — and for any classified or CUI environment — that is not a compliant architecture.

This is what a government-grade API gateway deployment actually requires, and how agencies can achieve it without accepting a second-rate product in exchange for sovereignty.

The three non-negotiables for government API infrastructure

1. Full on-premises or private cloud deployment — no vendor cloud required.

"Self-hosted" means different things to different vendors. For some, it means the data plane runs on your hardware but the control plane — where you configure policies, manage credentials, and view analytics — runs on the vendor's SaaS service. That is not genuinely self-hosted for a government agency.

A government-grade deployment requires that every component runs within the agency boundary:

The gateway runtime that processes API traffic
The admin interface where policies are defined and credentials are managed
The configuration store (policy definitions, credentials, access controls)
The audit log store
The developer portal where internal and partner API consumers access documentation and credentials

No component should make outbound calls to vendor infrastructure at runtime. Not for licence validation. Not for policy updates. Not for telemetry. Not for any reason.

2. Authentication against your own identity infrastructure.

Government agencies operate their own identity providers — Active Directory, LDAP, PIV/CAC card systems, or agency-specific OIDC infrastructure. The API gateway must authenticate requests against those systems, not against a vendor-hosted identity service.

For internal API consumers (agency staff, internal systems), this means validating JWT tokens or API keys against the agency's identity provider. For external consumers (partners, contractors, other agencies), it means supporting certificate-based mutual TLS authentication using government-issued PKI.

3. Audit logs that stay inside the boundary and meet your SIEM requirements.

Government audit requirements — FedRAMP, FISMA, DISA STIGs, and agency-specific requirements — mandate structured logging of all access events, stored in a tamper-evident format, retained for a defined period, and ingested by the agency's SIEM infrastructure.

Your gateway's audit logs must be in a format your existing SIEM can consume (structured JSON, CEF, or a configurable format), pushed to a log aggregator inside the boundary (Splunk, Elastic, or equivalent), and not dependent on a vendor cloud for log storage or retrieval.

The procurement and deployment reality

Government procurement processes have distinct requirements that affect how API gateway products are evaluated and deployed:

FedRAMP authorization status. For federal civilian agencies, FedRAMP authorization is often a procurement requirement. Understand whether a vendor's FedRAMP authorization covers the specific deployment model you need — some vendors have authorization only for their SaaS offering, which is not relevant if you need an on-premises deployment.

FIPS 140-2 cryptographic compliance. Government systems handling sensitive data often require FIPS 140-2 validated cryptographic modules for encryption and key management. Verify that the gateway's TLS stack and key management use FIPS-validated implementations.

DISA STIG hardening. Defence and intelligence environments often require that all deployed software comply with DISA Security Technical Implementation Guides. This affects the gateway's default configuration, the operating system it runs on, and the hardening steps required during deployment.

Air gap delivery. In classified environments, software cannot be pulled from the internet at deployment time. Container images must be deliverable via signed artifacts to an internal container registry. Updates must be verifiable and deliverable offline. Ask vendors explicitly: can you deploy and update this software in a network environment with zero outbound internet connectivity?

Multi-agency API sharing: the interoperability challenge

A pattern emerging across government is multi-agency API sharing — where one agency exposes data or services that other agencies consume, through a defined API contract. Think of national identity verification services, benefits eligibility APIs, or shared infrastructure registries.

This pattern introduces distinct API governance requirements:

Consumer identity at the agency level. When Agency B calls Agency A's API, the audit log needs to capture not just the technical client ID but the agency identity — the organisation, the programme, the authorised system. Agency-level identity is typically established through certificates issued by a government PKI (in the US context, Federal PKI or DoD PKI).

Per-agency rate limits and access tiers. Different consuming agencies have different authorised access levels and usage expectations. A national registry API consumed by 50 state agencies needs per-consumer rate limits, not a global shared limit that lets one state's bulk batch job crowd out real-time queries from all others.

Versioned API lifecycle with managed deprecation. Government systems have long upgrade cycles. An API exposed by a federal data repository may be consumed by state systems that cannot be updated quickly. The gateway needs to support running multiple API versions simultaneously, with a managed deprecation timeline communicated through the developer portal.

Cross-domain solutions for classified/unclassified bridging. In environments where APIs span different classification levels, data diodes and cross-domain solutions (CDS) are required at the network boundary. The API gateway sits on one side of that boundary — it does not replace the CDS, but it must be deployable in a topology where a CDS controls the data path between domains.

What a compliant government API estate looks like in practice

An agency running a compliant API estate on Zerq or an equivalent self-hosted platform looks like this:

Gateway runtime deployed on the agency's Kubernetes cluster or as Docker Compose on bare-metal infrastructure inside the boundary
Admin interface accessible only on the internal network, authenticated against the agency's OIDC or LDAP identity provider
API credentials (API keys, OAuth clients) stored in the gateway's local credential store, never sent to an external service
Audit logs shipped in structured JSON to Splunk or Elastic, retained per the agency's records management policy
Developer portal served from internal infrastructure, with sign-in via the agency's identity provider, presenting only the API products a given consumer is authorised to access
Updates delivered as signed container images to the agency's internal registry, verified before deployment

This is not a degraded mode. It is the full product, running entirely within the agency's control.

The vendor question to ask first

Before evaluating any API gateway product for a government deployment, ask this: "Can you provide a demo of your full product — admin UI, developer portal, policy management, observability — running with zero outbound internet connectivity on infrastructure we control?"

Vendors that cannot answer yes to that question are building for commercial cloud first. What they offer for on-premises is a second-tier experience. For government, that is not acceptable.

Zerq is built for full on-premises and air-gapped deployment — every component, zero outbound runtime dependencies, no vendor callbacks. See how it applies to government and public sector or request a demo to walk through your specific deployment requirements and data sovereignty constraints.