The moment AI spend gets questioned, "here's the dashboard" isn't enough — someone has to show the request was allowed, attributed to a budget, and provable after the fact. Helicone is a proxy-based observability layer: request logging, cost dashboards, prompt analytics, and cost-based rate limits that can 429-block a request inside a rolling window. It answers "what happened?" well, and its AI Gateway now routes and fails over between providers, while its LLM Security feature can block a detected prompt threat in-path. What it doesn't do is govern the spend before it happens or produce evidence an auditor would take: no cumulative monthly budget ledger, no org-role-scoped model allowlist, no approval workflow, no signed audit. Wardin is built from the request path out. The same in-path check that stops a spend over the cumulative monthly cap, or blocks a request off the model allowlist, is the check that gets written into an ED25519-signed, hash-chained receipt for every gateway-routed call. Enforcement and evidence aren't two tools stapled together — they're the same event.
✓ YES · ~ PARTIAL · ○ ROADMAP · ✕ NO
For the team whose job is understanding traffic it already trusts, Helicone's observability is ahead of ours: broader SDK and language coverage, session replay, and a longer track record of prompt-level analytics at scale. It is also no longer fair to call it logging-only — its AI Gateway does real routing and failover, it is Apache-2.0 and self-hostable, and its LLM Security can block a detected prompt threat in-path. Our tracing is opt-in and PII-redacted but younger, and our durable cold-tier retention is built and MinIO-tested but not yet running on a compliance backend — in development, not shipped. Where that stops is the decision itself: Helicone can show you the request that blew the budget, but it was never in a position to refuse it.
Wardin sits in front of the provider, so it can act, not just report: a request over the cumulative monthly budget is stopped before it bills, a call off the model allowlist gets a structured 403, and both outcomes — plus every allowed call — are written to a signed, tamper-evident receipt scoped to gateway-routed traffic. Helicone's window-based rate limits can throttle bursts, but there's no persistent budget ledger, no approval workflow, and nothing an auditor would accept as proof. That governance-and-evidence layer is the product for us and an add-on gap for them.
Choose Helicone if you only need visibility into traffic you already trust and want the deepest prompt-search and session-replay tooling. Choose Wardin when the spend has to be stopped and answered for: a cumulative monthly budget with approval workflow, model-allowlist and injection policy enforced in-path, and a signed receipt for every gateway-routed call. A dashboard reports the overspend after it clears. Wardin refuses it — and can prove it did.