> For the complete documentation index, see [llms.txt](https://docs.grandprotocol.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.grandprotocol.org/readme.md).

# Introduction

**The payment rail for autonomous AI agents.**

Grand Protocol is the unified payment layer for AI agents. It routes payments across the x402 and MPP protocols, settles every transaction on Robinhood Chain, and gives every agent a non-custodial wallet. One API call handles the rest.

***

## What is Grand Protocol?

AI agents are spending money. They rent compute, call APIs, browse the web, and pay other agents for services. The infrastructure to support this is fragmented: two major protocols are competing for the standard, settlement happens across multiple chains, and developers are rebuilding payment logic from scratch for every project.

Grand Protocol solves this at the infrastructure level. It provides:

* **A universal payment router** that detects whether a service requires x402 or MPP and handles the full payment handshake automatically
* **Non-custodial agent wallets** on Robinhood Chain, provisioned in one line of code
* **Spend policies** enforced at the gateway before any funds leave the wallet
* **On-chain settlement** for every payment, regardless of protocol, with a public Robinhood Chain transaction hash
* **Multi-agent payment chains** where every sub-agent payment is linked to the parent transaction on-chain

Grand Protocol does not build agents, choose AI models, or lock you into proprietary formats. It is payment infrastructure. Fast, transparent, and out of the way.

***

## Documentation

[Quickstart](/getting-started/quickstart.md)

[Installation](/getting-started/installation.md)

[Your First Payment](/getting-started/your-first-payment.md)

[x402 Protocol](/protocols/x402.md)

[MPP Protocol](/protocols/mpp.md)

[Payment Router](/features/payment-router.md)

[Agent Wallets](/features/agent-wallets.md)

[Spend Policies](/features/spend-policies.md)

[Multi-Agent Payments](/features/multi-agent-payments.md)

[Observability](/features/observability.md)

[Architecture](/platform/architecture.md)

[Security](/platform/security.md)


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