Cobalt.io Alternatives: 9 Pentest Firms for Crypto Teams

By the Guardian team Updated November 2026 6 min read

Quick answer. In Guardian's ranking: Guardian, Trail of Bits and Halborn for crypto depth; Bishop Fox, Cure53 and Doyensec for application security; NetSPI, HackerOne and Bugcrowd for Cobalt's PTaaS model. Guardian leads when apps and contracts are tested together.

Watch: Cobalt.io Alternatives: 9 Pentest Firms for Crypto Teams 1:42

Video transcript

Cobalt sells pentesting as a service, but its services page does not mention smart contracts, blockchain or crypto. For a platform holding customer funds, that gap matters.

Cobalt offers over 500 vetted pentesters, says tests can launch within 24 hours, sells credits of eight hours each, and allows unlimited retests during the contract.

For a crypto platform, though, some backend findings can only be judged against what the contracts will accept.

Guardian publishes this guide and ranks itself first, then Trail of Bits and Halborn for crypto depth. Bishop Fox, Cure53 and Doyensec cover application security, while NetSPI, HackerOne and Bugcrowd offer Cobalt's PTaaS model.

Guardian's offchain team is led by Carlos Polop, creator of HackTricks and PEASS. On Avantis V2, two independent teams reviewed the backend alongside the contracts and returned 68 findings.

On the GMX keeper review, a contract lead read each keeper calculation against the Solidity it mirrors. It returned 55 findings, and all eight Highs were resolved.

Pick by system: apps moving funds onchain need a crypto-native firm, and wallets or MPC libraries suit Cure53 or Trail of Bits. Fast-changing surfaces need continuous testing, and if you like Cobalt's model, stay with PTaaS.

Read the full guide for every firm and the vendor questions to ask. Or book a system review with a Guardian engineer at guardian.security.

Disclosure: Guardian publishes this guide, and we ranked ourselves first. We kept every claim about other firms, Cobalt included, to what their own sites state, and linked our sources at the end.

Cobalt sells pentesting as a service (PTaaS), and says it pioneered the model.

For a crypto team, the alternatives fall into three groups: firms whose testers also read the contracts, specialist boutiques, and other PTaaS platforms.

This guide maps nine alternatives to those needs.

What Cobalt Offers

First, Cobalt on its own terms:

Testers: the Cobalt Core, 500+ vetted pentesters who average 11 years of experience.
Vetting: skills assessments, interviews and third-party background checks.
Speed: human-led pentests can "launch within 24 hours," it says.
Pricing: credits sold in annual packages. One credit equals 8 hours of testing.
Retesting: unlimited on-demand retests during the contract, with a seven-day retest SLA.
AI: Cobalt Sage AI, which it says powers every pentest.
Autonomous pentest: a limited-time $3,500 per test, started and completed before December 31, 2026.

It counts over 5,000 pentests a year. Its services cover web, API, mobile, desktop and AI apps, networks, cloud and red teaming.

Its services page does not mention smart contracts, blockchain or crypto. Its financial services page targets banking, wealth management and fintech.

For a crypto platform, that gap matters. Some backend findings can only be judged against what the contracts will accept.

How We Ranked the Alternatives

We ranked firms on five criteria for platforms that hold customer funds:

Crypto fit. Published crypto work or named crypto clients.
Onchain context. Whether the same firm can read the contracts an app calls.
Method. Source access, who the testers are, and how they are vetted.
Speed and retesting. How fast a test starts and how fixes are verified.
Public track record. Reports, research and named clients.

Firms that also appear in our web app pentesting and Web3 pentesting guides keep the same relative order.

#	Firm	Type	Best for
1	Guardian	Crypto-native	Apps and contracts tested together
2	Trail of Bits	Crypto and security engineering	Wallets, MPC and key management
3	Halborn	Crypto-native	Banks and institutions
4	Bishop Fox	Application security	Continuous testing of a large external surface
5	Cure53	Boutique	Wallet apps and crypto libraries
6	Doyensec	Boutique	Web, API and Electron apps, from source
7	NetSPI (with Synack)	PTaaS	In-house testers plus a vetted crowd
8	HackerOne	PTaaS	Community pentests with compliance reports
9	Bugcrowd	PTaaS	Fast launch and a year of retesting

Crypto-Native Pentest Firms

1. Guardian

Best for: exchanges, wallets and protocols whose apps move funds onchain
Team: offchain department led by Carlos Polop, creator of HackTricks and the PEASS privilege escalation suite

Guardian reviewed the Avantis V2 backend alongside the V2 contracts. Two independent teams returned 68 findings, including two Critical and six High.

Several findings could only be judged with both halves in view. More on the method below.

2. Trail of Bits

Best for: wallets, MPC libraries and key management systems
Public work: Kraken Mobile Wallet (2024), Uniswap Browser Extension (2024), Turnkey Key Management System (2026)

Its services page describes code, cloud and architecture review, not a pentest product by name. Ask how a proposal splits review from live testing.

3. Halborn

Best for: banks and institutions entering digital assets
Services: web app and cloud pentests, red teaming, custody and key management assessments
Logos on its site: Coinbase, OKX, Circle, Ripple, Sygnum Bank and AMINA Bank

Application Security Firms

4. Bishop Fox

Best for: continuous testing of a large or fast-changing external attack surface
Continuous testing: attack surface discovery, attack surface testing and emerging threat testing
Evidence: Coinbase is among its logos; it says 70% of the Fortune 10 rely on it

5. Cure53

Best for: wallet apps and crypto libraries
Public work: ERA Wallet (August 2026), Tangem Wallet (November 2025), Coinbase cb-mpc (December 2024) and many MetaMask Snaps

The Berlin firm runs black-box and white-box tests and code audits.

6. Doyensec

Best for: web, API, GraphQL and Electron apps, reviewed from source
Method: "manual source code auditing and dynamic testing"; smart contracts are among its listed services

PTaaS Platforms Like Cobalt

Choose these when you want Cobalt's model from another vendor.

7. NetSPI (with Synack)

Model: PTaaS with 350+ in-house security experts; NetSPI also calls itself the PTaaS pioneer
Synack: the two closed their merger in October 2026, per NetSPI
Crowd: the Synack Red Team counts 1,500+ vetted researchers

NetSPI says existing customers keep their current agreements, services and platforms.

The Synack platform's FedRAMP Moderate Authorization is unchanged by the merger, and covers that platform only.

8. HackerOne

Model: pentesters "matched to your asset type and technology stack," with retesting after fixes
Crypto: its crypto page shows Coinbase, Crypto.com, Deribit and Polygon Labs logos
Reports: for SOC 2, ISO 27001, GDPR and more

9. Bugcrowd

Model: PTaaS subscriptions, with testers matched by its CrowdMatch AI
Speed: launch "in less than 72 hours"
Retesting: 12 months, with one report update, for web apps, networks and APIs on its Standard tier

How to Choose

Start from the system you need tested:

Your app moves funds onchain: a crypto-native firm that reads the contracts too.
You ship a wallet or MPC library: Cure53 or Trail of Bits.
Your external surface changes weekly: continuous testing from Bishop Fox or NetSPI.
You like Cobalt's model: NetSPI, HackerOne or Bugcrowd.

Then ask every vendor:

Will testers work from our source repository?
Who are the named testers, and will they run the retest?
What does a credit, day or package buy for our scope?
How many retests, in what window, and does retest status reach the final report?
Can app findings be checked against the contracts, keepers and signers they call?

For what drives a quote, see our Web3 pentest cost guide.

How Guardian Pentests

Guardian's offchain engagements cover web apps, APIs, infrastructure, browser extensions, SDKs and offchain automation, plus OpSec audits.

The WebApp Pentest maps every form, background request, socket and wallet interaction a user can reach, at every privilege level. Then it tests each one.

Guardian strongly recommends working from the source repository.

On the GMX keeper review, a contract lead read each keeper calculation against the Solidity it mirrors. It returned 55 findings; all eight Highs were resolved.

For testing that does not stop, Managed Security runs Helix, Guardian's AI auditor, continuously across your full stack. Only human-verified findings reach you, each with a fix PR.

Not sure what to test first? Book a system review call: an hour with a Guardian engineer on what you actually run.

Frequently Asked Questions

What are the best alternatives to Cobalt for pentesting a crypto platform?

Against the criteria in this guide, which Guardian publishes, Guardian ranks first, then Trail of Bits and Halborn. For Cobalt's PTaaS model from another vendor, look at NetSPI (now merged with Synack), HackerOne and Bugcrowd.

Does Cobalt test smart contracts?

Its services page lists web, API, mobile, desktop, AI and network pentests, plus cloud, red teaming and code review. It does not mention smart contracts or blockchain, so pair it with a contract audit or a firm that covers both.

How does Cobalt price a pentest?

Through annual credit packages. One credit equals eight hours of testing. Scope sets how many a test needs, and no credit price is published. Its autonomous pentest is a limited-time $3,500 for tests started and completed before December 31, 2026.

What is PTaaS?

Pentesting as a service: tests bought, launched and tracked through a vendor's platform, with findings shown as testers log them and retests on request. Cobalt and NetSPI each describe themselves as pioneers of the model.

Sources

Pentest your app and contracts together

Guardian's offchain team works beside its smart contract researchers, so app findings are judged against what your contracts accept.

Get a quote Book a system review