X402 MCP Server

by kwizzlesurp10-ctrl Your server? Claim it

answering

X402 MCP is answering right now. Last checked 10 min ago. It exposes 23 tools.

Pay for HTTP APIs and charge for your own: x402 micropayments in USDC on Base.

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 47 days of history

47 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

598 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 131

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 16 August 2026. No other catalogue keeps this.

17 Sep a tool appeared get_agent_card

17 Sep a tool disappeared get_agent_card

16 Sep a tool appeared get_agent_card

13 Sep a tool description was rewritten city.check

13 Sep a tool disappeared commerce.stripe_checkout

11 Sep 4 tools appeared mailrail.inbound, mailrail.send, mailrail.status and 1 more

11 Sep a tool description was rewritten swarm.revenue

8 Sep a tool changed version

25 Aug 19 tools appeared city.check, city.list, city.sample and 16 more

25 Aug 19 tools disappeared activate_pro_tier, build_seller_requirements, check_us_city_property and 16 more

and 82 more, back to 16 August 2026

Tools have disappeared from this server

A tool that vanishes takes a piece of your agent with it, and the change arrives silently. Watch this server and every such change lands in your inbox.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add x402-mcp --transport http https://x402-mcp.onrender.com/mcp/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "x402-mcp": {
      "url": "https://x402-mcp.onrender.com/mcp/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.x402-mcp]
url = "https://x402-mcp.onrender.com/mcp/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "x402-mcp": {
      "url": "https://x402-mcp.onrender.com/mcp/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "x402-mcp": {
      "url": "https://x402-mcp.onrender.com/mcp/mcp"
    }
  }
}

Available tools 23

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

x402

x402.agent_card

Return the A2A Protocol v1.0 Agent ID Card and MCP server card. Optional target_id filters to a skill id, name, or tag.

x402.build_seller

Build seller-side x402 payment requirements for your own HTTP resource. Pass resource_url plus discovery_* fields to catalog the endpoint in Bazaar.

x402.discover

Discover paid HTTP APIs in the x402 Bazaar via the facilitator catalog. Call this first to find a resource URL, then x402.probe and x402.pay_and_fetch.

x402.networks

List supported settlement networks, facilitators, and x402 v2 header names. Call when choosing a preferred_network for x402.pay_and_fetch or x402.build_seller.

x402.pay_and_fetch

Pay USDC via x402 and fetch a protected HTTP resource in one call. Requires EVM_PRIVATE_KEY on this host; otherwise use x402.probe for a no-spend 402.

x402.probe

Probe a URL for HTTP 402 PAYMENT-REQUIRED terms using the x402 client SDK. Use before x402.pay_and_fetch to inspect price, network, and payTo without spending.

x402.verify

Verify an x402 PAYMENT-SIGNATURE against PAYMENT-REQUIRED terms via the facilitator. Call after a buyer presents a signature and before releasing paid content.

commerce

commerce.activate_pro

Verify a Pro-tier x402 payment and unlock Pro quota limits for the agent. Call after commerce.pro_requirements and a completed USDC payment.

commerce.credits_requirements

Build x402 payment requirements to buy a pack of per-use MCP tool credits. Next: pay those terms, then commerce.purchase_credits with the signature.

commerce.pro_requirements

Build x402 payment requirements to purchase the Pro quota tier. Next: pay those terms, then commerce.activate_pro with the signature.

commerce.purchase_credits

Verify an x402 payment and add per-use tool credits to the agent. Call after commerce.credits_requirements and a completed USDC payment.

city

city.check

Run a paid US city property compliance check via x402 on the same HTTP resource buyers use. Prefer city.sample first. Settles USDC when EVM_PRIVATE_KEY is set; otherwise returns a 402 probe. Price: $0.01 per call (x402, USDC on Base/Solana/Arbitrum).

city.list

List US City Open-Data Compliance Network cities with paid_url, sample_url, and price. Call first, then city.sample, then city.check for the paid address lookup.

city.sample

Get a free fixed-address property compliance sample for one US city code. Use before city.check to validate city_code and response shape without paying.

mailrail

mailrail.inbound

Ingest an incoming message or webhook to the MailRail Postmaster agent with mention defusing and inbox ledger recording.

mailrail.send

Dispatch transactional receipts, alert notifications, or agent communication over MailRail. Supports mock ledger, Resend API, SMTP, or Webhooks.

mailrail.status

Inspect MailRail provider status, active sender address, and dispatch capabilities.

swarm

swarm.research

Run the swarm agency: compose a research product from free inputs and list it for resale. Pass allow_paid_inputs=true only when buying upstream x402 services is intended.

swarm.revenue

Get swarm composite economics: spend, composite sales, LTV:CAC, margins, per-source scores. total_revenue_usdc is swarm listings only; storefront.revenue_usdc is the full settled ledger. Call after swarm.research or swarm.settle to inspect realized economics.

swarm.settle

Verify and settle a buyer's x402 payment for a listed composite product and record revenue. Call with product_id plus PAYMENT-SIGNATURE after the buyer pays.

agent

get_agent_card

Back-compat alias for x402.agent_card. Returns the A2A Protocol v1.0 Agent ID Card and MCP server card.

ops

ops.metrics

Get host OS telemetry: CPU, memory, swap, disk, network, and an ok/warn/critical health verdict. Call to diagnose this MCP host; set include_processes=true for top memory processes.

pulse

pulse.base

Get live Base Network Pulse: base fee, EIP-1559 projection, utilization, USD settlement cost, verdict. Call before settling on Base when you need a settle-now vs hold recommendation.

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

activate_pro_tier

removed 25 Aug 2026

build_seller_requirements

removed 25 Aug 2026

check_us_city_property

removed 25 Aug 2026

create_stripe_checkout

removed 25 Aug 2026

discover_services

removed 25 Aug 2026

get_base_pulse

removed 25 Aug 2026

get_os_metrics

removed 25 Aug 2026

get_payment_requirements

removed 25 Aug 2026

get_pro_upgrade_requirements

removed 25 Aug 2026

get_supported_networks

removed 25 Aug 2026

get_tool_credits_requirements

removed 25 Aug 2026

get_us_city_property_sample

removed 25 Aug 2026

list_us_cities

removed 25 Aug 2026

pay_and_fetch

removed 25 Aug 2026

purchase_tool_credits

removed 25 Aug 2026

run_swarm_research

removed 25 Aug 2026

settle_composite_sale

removed 25 Aug 2026

swarm_revenue_report

removed 25 Aug 2026

verify_payment_payload

removed 25 Aug 2026

commerce.stripe_checkout

removed 13 Sep 2026

Endpoints

URL	Transport	State	Latency	Checked
https://x402-mcp.onrender.com/mcp/mcp	streamable-http	answering	640 ms	10 min ago

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X402 MCP — questions

Answers built from our own checks of this server.

What can X402 MCP do?

It exposes 23 tools, read directly from the server on our last check. Among them: city.check, city.list, city.sample, commerce.activate_pro, commerce.credits_requirements, commerce.pro_requirements and 17 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is X402 MCP mostly used for?

Its tools cluster around x402, commerce and city. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is X402 MCP working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 598 ms. The bar chart above shows every period we have measured.

Did X402 MCP ever remove tools?

Yes. activate_pro_tier, build_seller_requirements, check_us_city_property, create_stripe_checkout and 16 more are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.

Is X402 MCP still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

How do I connect X402 MCP?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does X402 MCP need an API key?

No. X402 MCP completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 23 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is X402 MCP?

It answers our handshake in 598 ms on average, which is faster than 21% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.