From an agent (MCP)

Every published processor is a connectable MCP server. No SDK, no integration code, an agent gets the URL, sees the tool and its schema, and can pay for a call on its own.

The endpoint

POST https://processors.x402compute.cc/processors/<slug>/mcp

Stateless, per the 2026-07-28 MCP revision: no handshake, no session id, no long-lived stream. initialize is still answered for 2025-era clients, so both generations work. GET on the same path returns a human-readable descriptor instead.

Adding it to a client

{
  "mcpServers": {
    "deep-research": {
      "type": "http",
      "url": "https://processors.x402compute.cc/processors/deep-research/mcp"
    }
  }
}

from langchain_mcp_adapters.client import MultiServerMCPClient

client = MultiServerMCPClient({
    "deep_research": {
        "transport": "streamable_http",
        "url": "https://processors.x402compute.cc/processors/deep-research/mcp",
    }
})
tools = await client.get_tools()

What the agent sees

tools/list returns one tool. One processor is one job, carrying its input schema and its price:

{
  "name": "deep_research",
  "description": "Researches a topic. $0.25 per run via x402, paid DIRECTLY to the publisher's wallet. The platform takes no share. A run that fails after starting is still billed; a run that never starts is not.",
  "inputSchema": { "type": "object", "properties": { "input": { … } }, "required": ["input"] }
}

The cost is in the description on purpose: an agent deciding whether to call a tool should see the price where it sees the purpose.

Paying for a call

Discovery is free. tools/call is the only method that costs anything. With no payment, the call comes back as a tool-level error carrying the HTTP status, not a protocol failure, because “you need to pay” is a normal answer the agent should act on:

{ "result": { "isError": true, "_meta": { "cc.x402compute/status": 402 } } }

Send an X-Payment header and it runs. Any x402 client can produce one; MCP clients that support custom headers pass it straight through.

const res = await fetch(MCP_URL, {
  method: 'POST',
  headers: { 'content-type': 'application/json', 'X-Payment': paymentHeader },
  body: JSON.stringify({
    jsonrpc: '2.0', id: 1, method: 'tools/call',
    params: { name: 'deep_research', arguments: { input: { topic: 'solana' } } },
  }),
});

One payment buys exactly one run, enforced across transports. The same X-Payment submitted over MCP and plain HTTP simultaneously results in a single execution; the loser gets 409.

As a LangGraph node, without MCP

A processor is just an HTTP call, so it drops into a graph directly:

import requests

def research_node(state):
    r = requests.post(
        "https://processors.x402compute.cc/processors/deep-research/run",
        headers={"Authorization": f"Bearer {TOKEN}"},   # your own processor
        json={"input": {"topic": state["topic"]}},
        timeout=60,
    )
    return {"research": r.json()["output"]}

graph.add_node("research", research_node)

State lives in your graph. The MCP CALL is stateless: one input, one output, no session, though the processor on the other side may keep its own state between runs. What it does not do is remember anything about your graph.

Long-running calls

If a run outlives the sync window you get 202 with a poll_url and a run token. Send Prefer: respond-async to get that immediately rather than waiting.

Supported methods

Method	Cost
`server/discover`	free
`initialize`, `notifications/initialized`, `ping`	free
`tools/list`	free
`tools/call`	charged

Anything else returns -32601. Mcp-Method and Mcp-Name headers are honoured, and a header that contradicts the body is rejected. So a gateway metering your traffic can never disagree with what actually ran.

Overview

User Guide

Slayer Agent

Core flows

Staking Engine

Singularity Cloud Network

Contract Addresses

ERC8004

Skills

Singularity Payments

Agentic Fundraisers

Enterprise

The endpoint

Adding it to a client

What the agent sees

Paying for a call

As a LangGraph node, without MCP

Long-running calls

Supported methods

​The endpoint

​Adding it to a client

​What the agent sees

​Paying for a call

​As a LangGraph node, without MCP

​Long-running calls

​Supported methods

The endpoint

Adding it to a client

What the agent sees

Paying for a call

As a LangGraph node, without MCP

Long-running calls

Supported methods