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24 alternatives to Open-source SDK to prevent duplicate payments and card

Developer friendly code and API security solution, AI-Powered real-time SAST | Sixth Learn more about Sixth

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Open-source SDK to prevent duplicate payments and card launched in 2024; newer entries below may have overtaken it.

  1. 1

    AI that spots real risks and keeps your code safe.

    2023 · codethreat.com · its alternatives →

  2. 2
    Prava▲343

    Are you a startup/builder who's using Agentic workflows? How about Agentic payments? At Prava we're building Payments stack which allows your AI Agents to have a wallet independent of the CC/bank acc. Thus, allowing them to make payments like us humans in a secure way.

    Mar 2026 · prava.space · its alternatives →

  3. 3

    Open-source, secure environment with real-world tools for enterprise-grade agents. - e2b-dev/E2B

    2023 · github.com · its alternatives →

  4. 4
    pay.sh▲346

    Discover, access, and pay for any API autonomously

    May 2026 · pay.sh · its alternatives →

  5. 5
    PayHere▲253

    Recurring payments with two lines of code

    2019 · payhere.co · its alternatives →

  6. 6
    SSOReady▲144

    Open source developer tools for enterprise single sign-on

    2024 · github.com · its alternatives →

  7. 7

    Hi everyone, We’re building an open-source identity and risk management platform and we’ve just released the first chunk of code, a fully customizable KYC flow & UI, to the public. We’ve chosen to use Svelte so our flows would be lightweight (it is ~50kb gzipped). Next up: - Adding forms and components for it to be used as a full onboarding flow. - Releasing an open-source case management dashboard, for manual approval of users. - Releasing an open-source rule engine, to help automate decisions. We’d love to hear your feedback, suggestions, or any question you’ve got. And if the rest of the…

    2022 · github.com · its alternatives →

  8. 8BO

    Hi HN, we’re the co-founders of Bearer, and today we launch an open-source alternative to code security solutions such as Snyk Code, SonarQube, or Checkmarx. Essentially, we help security & engineering teams to discover, filter and prioritize security risks and vulnerabilities in their codebase, with a unique approach through sensitive data (PII, PD, PHI). Our website is at https://www.bearer.com and our GitHub is here: https://github.com/bearer/bearer We are not originally Security experts but have been software developers and engineering leaders for over 15…

    2023 · its alternatives →

  9. 9

    OpenAgents - The collaboration OS for AI agents. Contribute to openagents-org/openagents development by creating an account on GitHub.

    Apr 2026 · open-agents.dev · its alternatives →

  10. 10

    Hi guys, am building SecureLend.ai and when working on our underwriting agents (free trial, paid after) I had issues with seamless payment options. Of course I looked at x402 which I believe is a great protocol but not a fan of a) sharing private keys with the agent b) having a human in the loop or c) similar workaround e.g. pre-funded wallets So I started building out a solution. For my use case it was important to not only have stablecoins but also a fiat rail which is now implemented using Stripe. Initially I build a mandate system internally but am very glad and big shoutout to the guys…

    Apr 2026 · delegare.dev · its alternatives →

  11. 11

    Smart contract development accessible to everyone

    2022 · lokicode.io · its alternatives →

  12. 12

    Hey HN, We’re two developers (co-founders) with a team of 20 who got tired of spending hours reviewing PRs, so we built Infinitcode.ai, an AI-powered code reviewer that: - *Summarizes PRs in plain English*: No more deciphering 1,000-line diff jungles - *Catches more than bugs*: Security holes, performance pitfalls, code smells, even typos (yes, we’ll flag “vurnerabilities” and vulnerabilities) - *Zero onboarding*: Works instantly—no “let me learn your codebase for weeks” nonsense. Why we’re posting: We’re in alpha and need brutal honesty. Roast our tool, mock our UI, or tell us why AI will…

    2025 · infinitcode.ai · its alternatives →

  13. 13

    AI-powered SAST Security That Actually Understands Your Code

    2025 · enforster.ai · its alternatives →

  14. 14

    A modern foundation for accepting payments

    2014 · paypal.com · its alternatives →

  15. 15

    An open-source platform for banks

    2014 · openbankproject.com · its alternatives →

  16. 16

    Secure Your Application with Artificial Intelligence

    2025 · cybedefend.com · its alternatives →

  17. 17

    AI without the billing headache. For developers — zero token costs. For users — one credit wallet across every app.

    Jul 2026 · rnetai.org · its alternatives →

  18. 18
    Recall▲16

    One developer solves it. Every developer knows it.

    Feb 2026 · recall.team · its alternatives →

  19. 19

    Hey Everyone! Avi and I (in the current YC S25 Batch) noticed how fragmented crypto compliance is with rules changing constantly, vary by region, and force developers and legal teams into a scramble. So we hacked together a prototype framework that generates a “guardrail” smart contract which: - Hooks into your KYC provider - Enforces rules defined a simple compliance.yaml file - Automatically blocks users you can't legally serve When regulations shift (new blocked country, updated KYC threshold, etc.), just update your YAML and redeploy with no smart contract rewrites. Audit prep also…

    2025 · github.com · its alternatives →

  20. 20

    Code quality & security platform

    Oct 2025 · its alternatives →

  21. 21

    GitHub: https://github.com/ClioAI/kw-sdk Most AI agent frameworks target code. Write code, run tests, fix errors, repeat. That works because code has a natural verification signal. It works or it doesn't. This SDK treats knowledge work like an engineering problem: Task → Brief → Rubric (hidden from executor) → Work → Verify → Fail? → Retry → Pass → Submit The orchestrator coordinates subagents, web search, code execution, and file I/O. then checks its own work against criteria it can't game (the rubric is generated in a separate call and the executor never sees it…

    Feb 2026 · github.com · its alternatives →

  22. 22
    Sixth▲2

    SDK to prevents duplicate payments and card payments.

    2024 · trysixth.com · its alternatives →

  23. 23OS

    tl;dr we released openapi.security, an online tool that performs a dozen of security tests on any given openapi/swagger-based API, with no signup or email required. You can try it here: https://openapi.security My team at Escape (YC W23) is mainly focused on securing GraphQL APIs. For this, we developed a new approach called Feedback driven API Exploration. Basically, we infer the right security tests cases to run using the specification and a carefully crafted in house graph traversal algorithm. (It's a bit long to describe here but we published a more in depth explanation of…

    2023 · openapi.security · its alternatives →

  24. 24

    Secure in-app payments for iOS and Android.

    2019 · developer.squareup.com · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →