Alternatives

Products that do what x402r Refund Protocol does

Refund & Arbitration Protocol For Agents

1. 1
   x402▲119

   An open protocol for internet-native payments from Coinbase

   2025

2. 2XA
   X402 – an open standard for internet native payments▲16

   Hi HN – excited to announce x402, initially developed by Coinbase (YC 12) x402 lets any HTTP API charge per request without issuing API keys or storing credit cards. Buyers (humans or AI agents) keep funds in their own wallet and dynamically discover compatible endpoints, call them as usual, and automatically pay a microtransaction in USDC or other tokens to settle. 90 second demo: https://www.youtube.com/watch?v=PV-L2AfLhJg Problem: Every time we want to use a new API we have to: find the service online create a developer account, copy a secret key into env vars, pre-fund or…

   2025 · x402.org

3. 3
   P402.io▲102

   Route, verify, and settle paid API calls with clear traces

   Jan 2026

4. 4
   AP2▲155

   The open protocol for agentic commerce

   Sep 2025

5. 5XD
   X402vps – Docker containers for AI agents, paid per hour with USDC▲14

   Jul 2026 · x402vps.com

6. 6
   x402stats▲3

   Independent x402 stats: organic volume, wash-trades removed

   Aug 2026 · x402stats.io

7. 7
   Rampp.xyz▲251

   Build your NFT community with no-code

   2022

8. 8
   X402AgentPay▲2

   x402 commerce layer for AI agents — beyond raw HTTP payments

   May 2026

9. 9
   CoinMirror▲108

   Decentralized ICO syndicates

   2018

10. 10
    HexPay▲177

    💎 Integrate P2P crypto payments easily

    2024

11. 11
    Collection.xyz▲76

    NFT liquidity incentive protocol

    2022

12. 12
    Agihalo▲68

    LLM Router for A.I Agent & Saas with x402

    Jan 2026

13. 13
    delegare▲70

    Give AI agents spending power without giving up control

    Apr 2026 · delegare.dev

14. 14
    x402 wallet API: 9 Base endpoints, USDC▲1

    9 Base endpoints for AI agents, paid in USDC per call

    Aug 2026 · api.kachangsia.com

15. 15
    ETHLend▲79

    Decentralized P2P marketplace to borrow against BTC, ETH

    2019

16. 16
    I Built a Payment SDK for AI Agents ▲8

    ask an agent to buy something, and it hits a wall. Why?

    Mar 2026

17. 17
    x402▲1

    Self-funding AI agents via HTTP 402 - no cards, no accounts

    20d ago · x402-ai-agent.space

18. 18
    x402Hub▲2

    Trust scores for x402 API & MCP services — for AI agents

    Jul 2026 · x402.chain-ops.xyz

19. 19
    AgentMint Verify▲3

    Verify agent payment endpoints before your AI spends

    Aug 2026 · agentmint-verify.lasting-design-mail.workers.dev

20. 20
    x401▲3

    Bringing proof of identity to the agentic Web

    Jun 2026 · x401.id

21. 21
    HTTPayer▲2

    The payment layer for AI agents to access any data API.

    Apr 2026 · httpayer.com

22. 22BN
    Backproto – network backpressure routing applied to AI agent payments▲5

    I’ve been applying backpressure routing (Tassiulas-Ephremides, 1992) to payment flows between AI agents. Streaming payment protocols let agents pay each other in real time, but there's no congestion control. When a downstream agent hits capacity, money keeps arriving. No reroute, no throttle, no feedback signal. TCP solved this for data networks. Agent payment networks haven’t. Backproto makes receiver-side capacity a protocol primitive. Agents stake tokens to declare capacity (concave sqrt cap makes Sybil splitting unprofitable), dual-signed completion receipts track actual performance, and…

    Mar 2026 · backproto.io

23. 23MJ
    Machinomy, JavaScript library for micropayments in Ether over HTTP▲9

    2017 · machinomy.com

24. 24
    run402▲1

    The full stack an AI agent can spin up and pay for

    Jul 2026 · run402.com

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