Private LLM API for Developers: Keys, Quotas, and Architecture Patterns

Developer requirements differ from consumers

Developers need stable endpoints, key rotation, quotas, and SDK compatibility — not just a chat box. A private LLM API for developers must meter fairly and document retention honestly. Cipher delivers OpenAI-shaped chat completions with Secrypt privacy posture. Consumers may never see the API; engineers live in it.

Treat API traffic as production data even when chat feels casual. SLAs may be informal on early-stage products — document accepted downtime for your service catalog honestly. Version API behavior in changelog — developers build automation assuming stability. Publish changelog when Cipher behavior changes — developers build sleep-deprived automation assuming stability.

Semantic versioning promise in README — downstream agents depend on stable error codes. Status page RSS in ops channel — small diligence prevents big outages. Changelog semver promise — downstream agents depend on stable error codes.

Authentication with sk_sec_ keys

Create keys in Account → API keys. Prefix sk_sec_. Copy once; store in vaults. Never embed in mobile clients or public repos. Rotate on schedule and on incident.

Separate keys per environment and per service. Call https://secrypt.space/v1/chat/completions. Use separate keys per microservice — blast radius containment beats convenience. Automate quarterly key rotation ticket in Jira — recurring task beats heroic memory.

Break-glass key in sealed ops envelope — document rare procedure before crisis. Hash keys at rest in vault metadata — never store plaintext beside code. Quarterly key rotation ticket in Jira — recurring beats heroic memory.

• One key per service or developer
• Store in vault, not git
• Separate staging and production keys
• Revoke on offboarding

Quota and cost architecture

Daily allowances by chat tier: Free 50, Pro 2000, Unlimited 10000 requests. $0.01 per request from prepaid credits. Architect workers to batch prompts. Cache idempotent completions where safe.

Alert on anomaly spikes. Fund credits before launches — embarrassed demos run out of money mid-request. Cache completions only when business logic allows staleness — privacy and caching trade off. Per-tenant keys in multi-tenant SaaS map spend to customers — margin math needs it.

Per-tenant keys in SaaS map margin per customer — CFO asks eventually. Grafana dashboard per key — pretty graphs help executives understand spikes. Sleep between agent retries — politeness saves credits and vendor goodwill. Per-tenant keys map SaaS margin per customer — CFO asks eventually.

Privacy architecture patterns

Gateway service holds keys; browsers never do. Redact PII in the gateway. Log metadata only. No training on conversations reduces downstream model leakage risk; it does not remove your obligation to minimize payloads.

Map which microservices may call Cipher in a service catalog. Gateway pattern enables centralized redaction — invest once, benefit everywhere. Document data flow diagram on first page of internal API guide — not appendix. Gateway redaction unit tests should fail CI when PII regex misses new field types.

Document the Cipher endpoint https://secrypt.space/v1 — whiteboard photo in wiki. Architecture review template includes Cipher data-flow box — mandatory field. Gateway redaction unit tests fail CI when PII regex misses new fields.

When to choose hosted private API vs local

Choose Cipher for speed, IDE agents, and moderate sensitivity with redaction. Choose local for air-gapped or regulatory custody requirements. Hybrid: local embedding search, Cipher for generation on retrieved public snippets. Revisit quarterly as models and policies shift.

Latency-sensitive paths may still prefer local — measure p95 before deciding. Regulatory questionnaire may force local — keep Secrypt path for non-regulated microservices. Latency SLO may force local for user-facing paths — measure p95 before architecture review. Document exception process when team wants local — exceptions without process become policy.

Student project uses Secrypt; prod secret uses local — teach both. Latency SLO may force local for user-facing paths — measure p95 first.

Uncensored API use cases

Security research summaries, adult content tooling with lawful gates, and frank code review bots benefit from fewer soft refusals. You still enforce illegal-use blocks at application layer with age and jurisdiction checks. Document content policy for your users — API tone is not permission.

Document blocked categories in your app FAQ — users appreciate clarity. Moderation dashboards in your product still need human review for user-generated outputs. Age-gate UX belongs in your app even when Secrypt blocks illegal upstream requests.

Legal reviews app store description mentioning uncensored — store policy matters too. Document lawful-use examples in API docs — developers need guardrails. Age-gate your app even when Secrypt blocks illegal upstream requests.

Observability without leaking prompts

Trace latency and status codes. Sample redacted prompt lengths, not contents. Use secure enclaves for debug replays when necessary. SIEM rules on sk_sec_ patterns in logs catch common mistakes early.

Post-incident, assume logs lied — rotate keys anyway. Sampling 1% of redacted metadata beats logging 100% of content. OpenTelemetry spans name operation, not prompt — adopt early. OpenTelemetry attribute allowlist documented — junior devs otherwise log everything.

On-call runbook forbids tailing prod logs with grep on user email — operational discipline. Sampling rate documented in runbook — on-call consistency. OpenTelemetry attribute allowlist documented for on-call consistency.

Load testing responsibly

Load test against staging keys with synthetic prompts. Respect daily allowances or budget credits intentionally. Do not point load generators at production keys from CI without caps. Measure p95 latency under realistic message sizes, not one-token pings.

Notify Secrypt support before unusual load tests if policy asks — good citizenship. Synthetic prompts only in load tests — never snapshot prod DB into load generator. Notify finance before intentional credit burn tests — avoids panic at accounting. Load test budget line item in project plan — approved spend prevents blame.

Synthetic user personas in load scripts — never prod emails. Notify finance before intentional credit burn tests — avoids accounting panic.

Launch checklist

Vault keys. Redact gateway. Fund credits. Set alerts. Document allowed data classes.

Train team on paste rules. Ship. Add runbook entry for credit exhaustion and key compromise. Re-read secrypt.space policy updates on calendar reminders. Post-launch day-three review: spend, errors, redaction misses.

Launch retro includes privacy checklist sign-off — same meeting, not later. Launch retro documents one privacy near-miss — learning item for next service. Customer support macro explains AI feature uses Cipher — frontline needs words. Week-two review scheduled at launch — drift caught early. Launch retro documents one privacy near-miss — learning for next service.

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