Slayer on the Marketplace

The Singularity MCP server exposes 35 tools that let any MCP-compatible AI client (Claude Desktop, Cursor, Windsurf, Claude Code, etc.) interact with the x402Studio marketplace. Browse listings, manage endpoints, process payments, and register agents — all through natural language.

Quick Setup

Claude Desktop
Cursor
Claude Code

Add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "singularity": {
      "url": "https://mcp.x402layer.cc/mcp"
    }
  }
}

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "singularity": {
      "url": "https://mcp.x402layer.cc/mcp"
    }
  }
}

Add to your project’s .mcp.json or global ~/.claude/mcp.json:

{
  "mcpServers": {
    "singularity": {
      "url": "https://mcp.x402layer.cc/mcp"
    }
  }
}

Authentication

Method	Format	Scope
Personal Access Token (PAT)	`sgl_pat_{48hex}`	Owner-wide (all endpoints + products)
Endpoint API Key	`x402_{32hex}`	Single endpoint only

Create PATs at Dashboard > Settings > PAT with granular scopes:

mcp:read — List inventory, fetch details and stats
mcp:endpoints:write — Update endpoints, manage webhooks
mcp:campaigns:write — Create and update fundraiser campaigns
mcp:products:write — Update product metadata and pricing
mcp:* — Full access

Discovery Tools

Browse and discover marketplace listings without any authentication.

Tool	Description
`browse_marketplace`	Search and filter listings by type, category, chain, rating, with pagination
`get_listing`	Full details for a specific listing by slug
`get_featured`	Featured marketplace items
`get_top_rated`	Top-rated listings
`get_agent`	ERC-8004 agent info by network and ID
`list_categories`	All available marketplace categories
`list_networks`	Supported blockchain networks
`list_agents`	All registered ERC-8004 agents with pagination

Management Tools

Manage your x402Studio resources programmatically. Requires a PAT.

Tool	Description	Scope
`list_my_endpoints`	List all your endpoints	`mcp:read`
`list_my_campaigns`	List all your fundraiser campaigns	`mcp:read`
`create_campaign`	Create a fundraiser campaign with internal endpoint provisioning	`mcp:campaigns:write`
`update_campaign`	Update allowlisted fundraiser campaign fields	`mcp:campaigns:write`
`get_endpoint_details`	Full endpoint info including credit balance	`mcp:read`
`get_endpoint_stats`	Usage analytics (requests, revenue, success rate)	`mcp:read`
`update_endpoint`	Update pricing, listing flags, webhook settings	`mcp:endpoints:write`
`delete_endpoint`	Permanently delete an endpoint	`mcp:endpoints:write`
`list_my_products`	List all your products	`mcp:read`
`update_product`	Update metadata, pricing, branding, listing state	`mcp:products:write`
`set_webhook`	Set or update webhook URL (returns signing secret)	`mcp:endpoints:write`
`remove_webhook`	Remove webhook from an endpoint	`mcp:endpoints:write`

Payment Tools

Complete payment-backed operations through MCP. These tools handle the x402 challenge-response flow.

Tool	Description
`request_endpoint_creation_payment`	Get the x402 challenge to create a new endpoint
`create_endpoint_with_payment`	Finalize endpoint creation after payment
`request_endpoint_topup_payment`	Get the x402 challenge to add credits
`topup_endpoint_with_payment`	Complete a credit top-up after payment
`request_product_purchase_payment`	Get the x402 challenge for a product purchase
`purchase_product_with_payment`	Complete a product purchase after payment
`request_endpoint_credit_purchase_payment`	Get the x402 challenge for credit pack purchase
`purchase_endpoint_credits_with_payment`	Complete a credit pack purchase after payment

How Payment Flows Work

Request — Call the request_* tool to get an x402 payment challenge
Sign — The AI client’s wallet signs the USDC payment on-chain
Complete — Call the corresponding completion tool with the X-Payment payload
Done — The resource is created, topped up, or purchased

Agent Registry Tools

Wallet-session tools for ERC-8004 and Solana-8004 agent management.

Tool	Description
`get_agent_registry_info`	Public registry info and supported networks
`request_agent_wallet_challenge`	Request wallet-auth challenge for registration
`verify_agent_wallet_challenge`	Verify signature, get session token
`list_my_agent_bindable_endpoints`	List endpoints available for agent binding
`list_my_registered_agents`	List agents owned by authenticated wallet
`prepare_agent_registration`	Prepare wallet-first registration flow
`finalize_agent_registration`	Finalize after on-chain transaction
`prepare_agent_update`	Prepare agent metadata update
`finalize_agent_update`	Finalize update after any on-chain tx
`submit_agent_feedback`	Submit reputation feedback for an agent

MCP never holds wallet private keys. The wallet signs locally, and MCP exchanges the signature for a short-lived session token.

MCP Resources

Static resources available via the MCP resource protocol:

URI	Description
`singularity://featured`	Featured marketplace listings
`singularity://top-rated`	Top rated listings
`singularity://categories`	Available categories
`singularity://networks`	Supported blockchain networks
`singularity://agents`	All registered ERC-8004 agents
`singularity://listing/{slug}`	Individual listing details
`singularity://agent/{network}/{id}`	Agent details by network and ID

Security

Secrets never touch the AI model — PATs and API keys are passed per-request to the MCP server and never stored. They are used only for authentication and immediately discarded after the request completes.
No secret logging — Token values are never written to logs, analytics, or any persistent storage on the MCP server.
Prompt injection safe — Because secrets are handled at the transport layer (HTTP headers), they cannot be extracted through prompt injection attacks against the AI client.
Scoped access — Read-only PATs (mcp:read) cannot perform writes. Endpoint-write PATs cannot mutate products (and vice versa).
Instant revocation — Revoked or expired PATs are rejected immediately. Revoke from Dashboard > Settings > PAT at any time.
Owner isolation — All tool calls are scoped to the authenticated owner’s resources. You cannot access another user’s data.

Server Info

Property	Value
Endpoint	`https://mcp.x402layer.cc/mcp`
Protocol	MCP `2024-11-05`
Transport	HTTP (stateless)
Total Tools	35

Full MCP Documentation

See the complete MCP server reference for advanced usage, direct API testing, and detailed parameter schemas.

Overview

User Guide

Slayer Agent

Core flows

Staking Engine

Singularity Cloud Network

Contract Addresses

ERC8004

Skills

Singularity Payments

Agentic Fundraisers

Enterprise

Slayer on the Marketplace

Slayer on the Marketplace

Quick Setup

Authentication

Discovery Tools

Management Tools

Payment Tools

How Payment Flows Work

Agent Registry Tools

MCP Resources

Security

Server Info

Full MCP Documentation

​Slayer on the Marketplace

​Quick Setup

​Authentication

​Discovery Tools

​Management Tools

​Payment Tools

​How Payment Flows Work

​Agent Registry Tools

​MCP Resources

​Security

​Server Info

Full MCP Documentation

Slayer on the Marketplace

Quick Setup

Authentication

Discovery Tools

Management Tools

Payment Tools

How Payment Flows Work

Agent Registry Tools

MCP Resources

Security

Server Info