KnoxCall vs Zuplo
Zuplo is a genuinely excellent developer-first, edge-deployed API gateway — OpenAPI-driven, config in git, a first-class dev portal, and API monetization across 300+ edge locations. But it’s an ingress gateway: it secures the traffic coming into your API and stores the upstream keys you paste. KnoxCall points the other way — the egress credential gateway, where the provider key is injected at the wire and never enters your workload at all. These solve different halves of the problem; most teams want both.
KnoxCall Advantages
- Provider key never enters your workload — injected at the egress wire, with no value-GET path on the hot path (not pasted into a gateway policy or vault)
- Custodial rotation mints/verifies/deletes the provider’s own child keys — rotates the underlying vendor secret, not just a lease TTL
- Covers static bearer keys (Stripe, OpenAI, Twilio) that expose no token-exchange endpoint — the un-federatable case
- DPoP-bound short-lived tokens + RFC 8693 workload identity federation
- Format-preserving tokenization for PAN / SSN / email + one-shot Ephemeral Proxy
- Encryption-as-a-Service: encrypt / decrypt / rewrap + JWT/RSA/ECDSA/Ed25519 signing with alg-confusion defence + BYOK
- AI Gateway: capability keys, streaming PII redaction, prompt firewall + canary leak, per-agent budgets
- All-in-one managed SaaS, one bill, minutes to set up
Zuplo Advantages (Honest)
- Best-in-class developer portal — API catalogs, self-serve key management, docs generated from your OpenAPI spec
- Built-in API monetization: pricing plans, phases, rate cards, metered billing
- 300+ edge locations for genuinely low global ingress latency
- Git-native, OpenAPI-driven config — policies live in your repo and ship through CI/CD
- Generous free tier and a cheaper $25/mo paid tier for pure ingress gateway needs
- Mature inbound concerns: request auth, JWT validation, upstream routing, rate limiting at the edge
Feature Comparison
Credential Exposure & Direction of Travel
| Feature | KnoxCall | Zuplo |
|---|---|---|
Upstream/provider key never enters the workload (egress wire injection) Does the real vendor key ever land where your code can read it? | ✓
Injected at egress; no value-GET on the hot path | ✗
You paste the upstream key into Zuplo; it’s stored and replayed by the gateway |
Primary direction of traffic secured Ingress (into your API) vs egress (out to third parties) | Egress | Ingress |
Custodial rotation of the underlying VENDOR key Mint / verify / delete the provider’s own child keys (Cloudflare, SendGrid, AWS IAM…) | ✓
Rotates the real vendor key itself | ✗
Stores the key you paste; no provider-side rotation |
Works for static keys with no token-exchange endpoint Stripe / OpenAI / Twilio bearer tokens that cannot be federated away | ✓
Egress injection needs no vendor STS | ✗
Not the product’s job — it fronts your inbound API |
Ingress Gateway Capabilities
| Feature | KnoxCall | Zuplo |
|---|---|---|
OpenAPI-driven, git-native config Policies and routes defined in code, shipped through CI/CD | ~
API + UI config; not OpenAPI-source-of-truth in git | ✓
Git-native, OpenAPI-first — a core strength |
Global edge deployment (300+ locations) Run gateway logic close to inbound callers | ✗
Regional egress hops, not an edge CDN | ✓
300+ edge data centers |
Inbound request auth & JWT validation Authenticate callers hitting your API | ~
API keys + inbound webhook auth; not a full front-door gateway | ✓
Purpose-built for this |
Rate limiting Throttle request volume | ✓
On proxied routes | ✓
At the edge, per key/plan |
Developer Portal & Monetization
| Feature | KnoxCall | Zuplo |
|---|---|---|
Self-serve developer portal & API catalog Docs, key issuance, and catalogs for your API consumers | ✗
No consumer-facing dev portal | ✓
Best-in-class, OpenAPI-generated |
API monetization (plans, rate cards, metered billing) Charge consumers for access to your API | ✗
Not a monetization platform | ✓
Pricing plans, phases, rate cards |
Consumer API key management (issue keys to your users) Let external developers self-manage their keys | ~
Your own tenant keys, not a consumer portal | ✓
Full consumer key lifecycle |
Data Protection & Crypto
| Feature | KnoxCall | Zuplo |
|---|---|---|
Format-preserving tokenization (PAN / SSN / email) Shape-mimicking tokens so downstream systems stay untouched | ✓
Tokenization vaults (Pro+) | ✗
Not a tokenization / vault product |
Encryption-as-a-Service (encrypt / decrypt / rewrap) Crypto operations without exposing key material | ✓ | ✗ |
JWT + asymmetric signing (RSA / ECDSA / Ed25519) with BYOK Sign & verify with algorithm-confusion defence | ✓
Alg-confusion defence built in (Pro+); BYOK Enterprise | ~
Validates inbound JWTs; not a signing/crypto service |
AI / Agent Security
| Feature | KnoxCall | Zuplo |
|---|---|---|
AI egress gateway with provider key off-workload Capability keys; LLM provider key never enters the agent’s process | ✓
Capability keys, egress injection | ~
Has an AI Gateway, but you still paste the provider key into it |
Streaming PII redaction (FF3-1 + hold-back FSM) Redact sensitive tokens mid-stream on the AI egress path | ✓
Streaming redaction (Pro+) | ✗ |
Prompt firewall + canary leak + per-agent budgets Guardrails and spend controls for agent traffic | ✓
Budgets recorded, not hard-enforced (Pro+) | ~
Guardrails/policies on Enterprise; no canary-leak |
Operations & Setup
| Feature | KnoxCall | Zuplo |
|---|---|---|
Managed SaaS No infrastructure to deploy or manage | ✓ | ✓
Also managed; self-host portal available |
Setup Time Time from sign-up to production | Minutes | Minutes |
Built-in analytics, geo & alerting Usage metrics, world-map geo, Email/SMS/Slack alerts | ✓
Geo map + alerts (alerts Pro+) | ~
Analytics yes; observability add-on on Enterprise |
Compliance posture Security certifications and attestations | ~
SOC 2 Type II in progress; aligned; BAA available | ✓
SOC 2 controls on Enterprise |
In Depth
Zuplo and KnoxCall get compared because both call themselves an “API gateway” — but they point in opposite directions. Zuplo is an ingress gateway: it sits at the front door of an API you publish, authenticates inbound callers, routes and rate-limits at the edge, and gives your consumers a portal to grab keys and read docs. It is one of the best developer experiences in that category. KnoxCall is an egress credential gateway: it sits on the path out to the third-party APIs your code calls, and its whole reason to exist is that the provider’s key never enters your workload.
The distinction matters most for the keys themselves. To secure an upstream call, Zuplo — like every ingress gateway — needs the upstream credential, so you paste your Stripe or OpenAI key into a policy and the gateway replays it. That is fine and normal for an ingress product; it is simply the opposite of what KnoxCall does. KnoxCall injects the provider key at the egress wire so it never lands in a policy, a file, or the running process. And where Zuplo stores whatever key you paste, KnoxCall’s custodial rotation mints and deletes the provider’s own child keys — rotating the underlying vendor secret on a schedule, not just cycling a lease around a static key.
When to Choose KnoxCall
Choose KnoxCall when the risk you care about is the outbound credential: a Stripe, OpenAI, Twilio, or SendGrid key that would otherwise sit in an env var where an RCE, a poisoned dependency, or a prompt-injected agent could read it. KnoxCall takes that plaintext handoff off your machine, rotates the real vendor key, tokenizes PAN/SSN/email, offers encryption and asymmetric JWT signing as a service, and adds an AI egress gateway with streaming PII redaction and a prompt firewall — all as one managed SaaS on a single bill.
When to Choose Zuplo
Be honest: if the job is “stand up a great front door for an API we publish,” Zuplo is likely the better tool, and KnoxCall does not try to replace it. Choose Zuplo when you want your gateway config to live in git as OpenAPI, shipped through your existing CI/CD; when you need a polished, self-serve developer portal with API catalogs and consumer key management; when you want to monetize your API with pricing plans, phases, and rate cards; or when global inbound latency across 300+ edge locations is a hard requirement. Its free tier is generous and its paid tier starts cheaper than ours. None of that is a KnoxCall feature, and for pure ingress-gateway teams that combination is hard to beat.
The honest residual
KnoxCall’s egress model is not zero-residual, and we won’t claim it is. Taking the provider key off your machine does not leave nothing behind: a short-lived, scoped, revocable KnoxCall token still lives in your workload and can route requests through the proxy until it is revoked. The difference is what that token is — scoped to specific routes, DPoP-bindable, audited on every call, and expiring in minutes — versus a static vendor key that is valid for years. This is a trust dependency and an extra network hop, the same tradeoff you accept with any federation layer.
The scope is deliberately narrow, too. Egress wire injection applies to third-party outbound bearer keys on the hot path. It does not front the inbound traffic to your own API — that is Zuplo’s job, and it does it well. Per-agent budgets are recorded and reported, not hard-enforced at the packet level. And to be clear about what KnoxCall is not: it is not open source, there is no drop-in Vault shim or Kubernetes sidecar injector, our six SDKs live in the monorepo rather than on pip or npm yet, and migration from other stores is import-only — not a two-way sync. The right mental model is complementary: Zuplo at the front door, KnoxCall on the way out.
Pricing Comparison
KnoxCall
- 1 Route
- 100 API calls/month
- 1 Secret · 1 Vault (1k tokens)
- 2 Crypto Keys (AES)
- 1 Inbound Webhook
- Basic Analytics · 7-day retention
- 2 Routes
- 10K API calls/month
- 5 Vaults (50K tokens)
- Ephemeral Proxy (100K ops/mo)
- Basic Analytics
- No Alerts / FPE / crypto+JWT / PII-redaction (Pro+)
- 25 Routes
- 1M API calls/month
- Email Alerts
- Format-Preserving Tokens + JWT/Asymmetric Crypto
- Streaming PII Redaction (FF3-1 + hold-back FSM)
- Prompt Firewall + Canary Leak · 100K AI calls/mo
- OIDC workload federation · Advanced Analytics
- Unlimited Routes
- Unlimited API calls
- Unlimited Team · Unlimited Vaults / tokens / Crypto Keys
- All Pro Features
- BYOK via tenant master key
- Dedicated Fixed Outbound IP · Priority Support
Zuplo
- 100K requests/month · 1 GB egress
- Up to 2 gateway developers
- Unlimited environments, API keys, dev portals
- No custom domains · no SLA · community support
- 100K requests included; +$100 per extra 100K (to 1M)
- 2 custom domains
- Unlimited environments, API keys, dev portals
- Community support · no SLA
- Custom / unlimited requests & domains
- Up to 99.999% SLA
- Git integrations, SSO + RBAC, SOC 2 controls, audit logs
- Min $1,000/mo on annual contract
Separate line items exist for Zuplo’s AI Gateway (Builder free at 1K requests/mo; Enterprise contact-priced) and Developer Portals (open-source self-host free; managed hosting + monetization on Enterprise). Pricing verified from zuplo.com/pricing (July 2026).
Frequently asked questions
Is KnoxCall a replacement for Zuplo?
No, they are complementary. Zuplo is an ingress gateway that secures the traffic coming into an API you publish, with inbound routing, a developer portal, and monetization. KnoxCall is an egress credential gateway that sits on the path out to the third-party APIs your code calls, so the provider key never enters your workload. They solve different halves of the problem, and most teams want both.
Can I run KnoxCall alongside Zuplo?
Yes, that is the model this page recommends. Zuplo stays at the front door for inbound routing, portals, and monetization, while KnoxCall sits on the way out and injects provider keys at the egress wire. The two products point in opposite directions, so there is no overlap to reconcile.
When is Zuplo the better choice?
Zuplo is likely the better tool when the job is standing up a front door for an API you publish. Choose it when you want gateway config to live in git as OpenAPI and ship through CI/CD, when you need a self-serve developer portal with API catalogs and consumer key management, when you want to monetize your API with pricing plans and rate cards, or when inbound latency across 300+ edge locations is a hard requirement. Its free tier is generous and its paid tier starts cheaper than KnoxCall's.
How does KnoxCall's pricing compare with Zuplo's?
Both are managed SaaS products with free tiers. KnoxCall's paid plans are Starter at $19/month, Pro at $99/month, and a custom-priced Enterprise tier. Zuplo's Builder plan is $25/month with 100K requests included, plus $100 per extra 100K requests, and its Enterprise plan starts at $1,000/month on an annual contract. Zuplo also prices its AI Gateway and developer portal hosting as separate line items.
Keep Zuplo at the front door. Take the provider key out of the pod.
Ingress and egress are two different jobs. Run Zuplo for inbound routing, portals, and monetization — and put KnoxCall on the way out, so your Stripe and OpenAI keys never render into a container again.