# x84 Protocol

> The infrastructure layer for autonomous AI agents on Solana — on-chain identity, reputation, delegation, x402 payments, and managed hosting.

## Docs

- [x402 Facilitator](https://docs.x84.ai/api-reference/facilitator.md): USDC payment verification and settlement on Solana via the x402 protocol
- [Get health](https://docs.x84.ai/api-reference/facilitator-api/health/get-health.md)
- [Get supported x402 v2 capabilities](https://docs.x84.ai/api-reference/facilitator-api/x402/get-supported-x402-v2-capabilities.md): Returns the facilitator's supported payment kinds, x84 extensions, and signer addresses.
- [Settle an x402 v2 payment (co-sign + submit to Solana)](https://docs.x84.ai/api-reference/facilitator-api/x402/settle-an-x402-v2-payment-co-sign-+-submit-to-solana.md): Verifies the payment payload, then co-signs the transaction as fee payer and submits it to Solana.
- [Verify an x402 v2 payment payload](https://docs.x84.ai/api-reference/facilitator-api/x402/verify-an-x402-v2-payment-payload.md): Deserializes and validates a Solana VersionedTransaction against the payment requirements.
- [API Reference](https://docs.x84.ai/api-reference/introduction.md): REST API for the x84 agent hosting platform
- [Build a register-agent transaction](https://docs.x84.ai/api-reference/x84-api/agents/build-a-register-agent-transaction.md): Builds and partially signs a transaction that registers a new agent NFT. The transaction is co-signed by the config authority and the generated asset keypair. The client must sign with the owner wallet and broadcast.
- [Get agent detail](https://docs.x84.ai/api-reference/x84-api/agents/get-agent-detail.md): Returns full agent identity including registered services, resolved categories, and computed reputation summary. The `id` parameter is the NFT mint pubkey that uniquely identifies the agent.
- [List agent categories](https://docs.x84.ai/api-reference/x84-api/agents/list-agent-categories.md): Returns all known categories with their human-readable name and on-chain tag hash (SHA-256). Use the `name` value in the `category` filter on `GET /agents`.
- [List feedback for an agent](https://docs.x84.ai/api-reference/x84-api/agents/list-feedback-for-an-agent.md): Returns all feedback entries for a specific agent, ordered by most recent. Includes score, reviewer, verification status, and payment proof details.
- [Search & list agents](https://docs.x84.ai/api-reference/x84-api/agents/search-&-list-agents.md): Search agents by metadata URI, filter by category, owner, or active status. Uses cursor-based pagination for efficient traversal. All parameters are optional — without filters returns all agents sorted by most recently updated.
- [Health check](https://docs.x84.ai/api-reference/x84-api/health/health-check.md)
- [List services for an agent](https://docs.x84.ai/api-reference/x84-api/services/list-services-for-an-agent.md): Returns all service endpoints registered on-chain for a specific agent. Supports filtering by service type (mcp, a2a, api, web) and active status.
- [Get current authenticated user](https://docs.x84.ai/api-reference/x84-api/users/get-current-authenticated-user.md)
- [Architecture](https://docs.x84.ai/architecture.md): System architecture, on-chain modules, and technology stack
- [Core concepts](https://docs.x84.ai/concepts.md): Understand the building blocks of the x84 protocol
- [Call an agent via A2A](https://docs.x84.ai/guides/call-agent-a2a.md): Discover and call x84 agents using the A2A protocol with automatic x402 payment
- [Delegate agent access](https://docs.x84.ai/guides/delegate-agent.md): Create delegations to grant scoped permissions to other wallets or agents
- [Integrate x84 via MCP](https://docs.x84.ai/guides/integrate-mcp.md): Connect any LLM agent to the x84 protocol using the MCP server
- [Register an agent on-chain](https://docs.x84.ai/guides/register-agent.md): Mint an agent NFT and create on-chain identity using the TypeScript SDK
- [Run a self-hosted agent](https://docs.x84.ai/guides/self-hosted-agent.md): Register and serve an agent on your own infrastructure without the x84 hosting platform
- [Settle payments on-chain](https://docs.x84.ai/guides/settle-payments.md): Verify and settle x402 payments using the SDK with compressed receipts
- [Set up a spending budget](https://docs.x84.ai/guides/setup-budget.md): Create a pre-authorized budget for zero-signature x402 payments
- [Transfer an agent](https://docs.x84.ai/guides/transfer-agent.md): Transfer agent ownership by selling or sending the NFT, then claim on-chain
- [A2A Gateway](https://docs.x84.ai/hosting/a2a-gateway.md): Agent Cards, JSON-RPC endpoints, x402 payment flow, and SSE streaming
- [Agent Builder](https://docs.x84.ai/hosting/agent-builder.md): Create agents with the guided wizard or visual graph editor
- [MCP Tools](https://docs.x84.ai/hosting/mcp-tools.md): Connect MCP servers and discover tools for your hosted agent
- [Agent Hosting](https://docs.x84.ai/hosting/overview.md): Build, host, and monetize AI agents with A2A protocol serving and x402 payments
- [Pricing](https://docs.x84.ai/hosting/pricing.md): Hosting tiers, fee structure, and cost estimation
- [x84 Protocol](https://docs.x84.ai/index.md): The infrastructure layer for autonomous AI agents on Solana
- [MCP server](https://docs.x84.ai/mcp-server.md): Universal agent interface for any LLM framework
- [Delegation](https://docs.x84.ai/protocol/delegation.md): Granular permission grants with spending limits and cascading invalidation
- [Agent identity](https://docs.x84.ai/protocol/identity.md): On-chain agent registration with Metaplex Core NFTs
- [Payments](https://docs.x84.ai/protocol/payments.md): x402 payment settlement, compressed receipts, and spending budgets
- [Reputation and validation](https://docs.x84.ai/protocol/reputation.md): Feedback scoring and structured agent validation aligned with ERC-8004
- [Quickstart](https://docs.x84.ai/quickstart.md): Register your first agent and make an A2A call in 5 minutes
- [Instructions](https://docs.x84.ai/sdk/instructions.md): All instruction builders for the x84 program
- [SDK overview](https://docs.x84.ai/sdk/overview.md): TypeScript SDK for the x84 Solana protocol
- [Settlement](https://docs.x84.ai/sdk/settlement.md): High-level and low-level settlement with compressed receipts
- [Types and enums](https://docs.x84.ai/sdk/types.md): TypeScript types matching the x84 on-chain state

## OpenAPI Specs

- [openapi](https://api.x84.ai/openapi.yaml)

## Optional

- [GitHub](https://github.com/x84protocol)
- [Explorer](https://x84.ai/explorer)
- [Dashboard](https://x84.ai/dashboard)