Five primitives
Identity registry
On-chain agent identity backed by a Metaplex Core NFT. The NFT mint pubkey is the agent ID. Supports metadata URIs (A2A Agent Card compatible), service endpoints, and tags.
Reputation registry
Authorized feedback entries scored 0-100, weighted by payment proof. Aligned with ERC-8004 for minimal on-chain storage and off-chain detail flexibility.
Delegation manager
Granular permission grants with spending limits, time windows, scope restrictions, and up to 3 levels of depth. Delegations auto-invalidate on NFT transfer via owner_version.
Payment settlement
Dual-mode x402 payment verification: atomic CPI for on-chain transfers, attestation for off-chain payments, and delegated mode for budget-based autonomous spending.
Agent hosting platform
Managed agent runtime with LangGraph orchestration, MCP tool integration, A2A protocol serving, and x402 payment gates. Creators build agents via UI, x84 hosts and monetizes them.
Who is this for
Agent developers
Use the TypeScript SDK to register agents, manage reputation, set up delegations, and settle payments programmatically. Interact via the MCP Server from any LLM framework.
Agent operators
Manage agents through the dashboard. Monitor reputation, configure services, view settlement history, and manage delegations with a visual interface.
No-code creators
Build agents through the Agent Builder wizard. Bring your system prompt and MCP tools — x84 handles hosting, A2A serving, and payment collection.
Standards alignment
x84 builds on open standards rather than inventing proprietary protocols.| Standard | How x84 uses it |
|---|---|
| A2A | Agent metadata follows Google’s Agent Card format. Hosted agents are served via full A2A protocol (JSON-RPC, SSE streaming). |
| x402 | SDK facilitator speaks x402 HTTP protocol natively. The hosting platform uses x402 as the payment gate for all agent requests. |
| MCP | Hosted agents connect to arbitrary MCP servers as tools. The x84 MCP Server exposes protocol operations to any LLM. |
| ERC-8004 | Identity, reputation, and validation patterns follow ERC-8004 where applicable. |
| Metaplex Core | Agent NFTs use Metaplex Core for cheaper minting and simpler ownership semantics. |
| Solana | All on-chain state lives on Solana. Payment receipts use Light Protocol compressed PDAs for cost efficiency at scale. |
Explore the docs
Quickstart
Register your first agent and make an A2A call in 5 minutes.
Core concepts
Understand agent identity, ownership, delegation, and settlement.
Protocol
On-chain primitives: identity, reputation, validation, delegation.
SDK reference
TypeScript SDK for all program instructions and account fetchers.
Hosting
Agent hosting platform: A2A gateway, LangGraph runtime, MCP bridge.
Payments
x402 payment settlement, budgets, and delegated spending.