> ## Documentation Index
> Fetch the complete documentation index at: https://www.agentcommercekit.com/llms.txt
> Use this file to discover all available pages before exploring further.

# References

> External specifications, protocols, and related work referenced in the ACK documentation.

## Light Paper Overview

<Card title="ACK Overview" icon="file-pdf" iconType="solid" href="https://catenalabs.com/assets/pdfs/ACKOverview.pdf">
  Download a light paper overview of ACK.
</Card>

## External References

* [Announcing the Agent2Agent Protocol (A2A)](https://developers.googleblog.com/en/a2a-a-new-era-of-agent-interoperability/)
  *Source: Google for Developers Blog*

* [Coinbase x402 Protocol Repository](https://github.com/coinbase/x402)
  *Source: Coinbase GitHub*

* [Decentralized Identifiers (DIDs) v1.0](https://www.w3.org/TR/did-core/)
  *Source: W3C Recommendation*

* [Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content (Section 6.5.2: 402 Payment Required)](https://datatracker.ietf.org/doc/html/rfc7231#section-6.5.2)
  *Source: IETF RFC 7231*

* [JSON Web Token (JWT)](https://datatracker.ietf.org/doc/html/rfc7519)
  *Source: IETF RFC 7519*

* [L402 Protocol](https://github.com/l402-protocol/l402)
  *Source: l402 GitHub*

* [LangChain Documentation (Python)](https://python.langchain.com/docs/introduction/)
  *Source: LangChain Project*

* [LOKA Protocol: A Decentralized Framework for Trustworthy and Ethical Al Agent Ecosystems](https://arxiv.org/abs/2504.10915)
  *Source: Ranjan, R., Gupta, S., & Singh, S. N. (arXiv preprint)*

* [Model Context Protocol (MCP) Specification](https://modelcontextprotocol.io/specification/)
  *Source: Model Context Protocol Project*

* [Verifiable Credentials Data Model v1.1](https://www.w3.org/TR/vc-data-model/)
  *Source: W3C Recommendation*