Drop-in SDK that wraps your existing OpenAI / Anthropic / DeepSeek client. Set hard spend caps, get automatic failover when a provider 429s or bans you, and kill any customer's access in one API call.
One line. Zero proxy. No latency tax.
Three weeks in April 2026 that changed how we think about LLM provider risk.
"Anthropic disabled 60 employees' accounts in 15 hours — no warning, no SLA, contact via Google Form."
"Claude Code removed from $20 Pro plan — reversed only after 579-upvote HN thread and public revolt."
"DeepSeek v4 launched at ~5× cheaper than Opus 4.6. OpenAI raised GPT-5.5 to 2× the price. Same day."
Per API key, per customer, per model, per time window. Cap math is bit-exact deterministic — no surprises on your bill.
When OpenAI 429s, you hit a cap, or a provider bans your key — instantly route to DeepSeek, Anthropic, or OpenRouter.
Cut off any customer's LLM access in one API call. Essential for fraud prevention and metered SaaS products.
Route to the cheapest capable model for each call. Pricing catalog synced daily. 10× spread between providers means routing pays for itself.
Pre-call evaluation runs on Cloudflare Workers + Durable Objects. Strong consistency per customer with no latency tax on your requests.
Telemetry exportable to LLMeter via API key. One dashboard for observability (what you spent) and enforcement (what you're allowed to spend).
wrapOpenAI(client) — same interface, no proxy rewrite, no base URL change. Works with your existing SDK calls.
Define hard limits in cents per day / per customer / per model. Add fallback providers in priority order. Ship in the same PR.
Next time a provider bans accounts or triples prices overnight, your product keeps running. Budget Guard routes around the problem automatically.
| Capability | LLMeter / Helicone | OpenRouter / Portkey | Budget Guard |
|---|---|---|---|
| Cost observability | ✓ | partial | ✓ |
| Hard spend caps (runtime enforcement) | — | — | ✓ |
| Multi-provider failover | — | ✓ | ✓ |
| Per-customer kill-switches | — | — | ✓ |
| No proxy / no base URL change | ✓ | — | ✓ |
| Access-ban risk mitigation | — | partial | ✓ |
Early access list — get notified when the SDK drops, plus priority onboarding.
No spam. Unsubscribe any time.