Skip to content
anlyon.devby Anlyon

Northline ChainKit

dev.workers.northline-c86.northline-chainkit/chainkitnorthline-chainkit.northline-c86.workers.devstreamable-httpv1.1.0Scanned

Pay-per-call Base & Arc onchain facts for agents: address risk, USDC payment check, tx explain.

6 tools: 1 do something that can't be undone, 3 change things and 2 only read.

Tools: 0 delete, 1 irreversible, 3 write, 2 read.
  • Reads private data · 0
  • Reads text others write · 5
  • Can send data out · 1
  • 1 finding

Anlyon alternative

4 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →
Compare with similar serversMarkdownJSONReport this listing

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

6 tools

Can't be undone 1Claude Code: ask
  • verify_usdc_paymentVerify that a transaction paid at least N USDC to an address on Base or Arc (handles Arc native-USDC logs).Reads text others writeCan send data out1 finding

    Why it is in this group

    • The name "verify_usdc_payment" says "payment": a word that usually means money moves, which cannot be taken back.
    • The input addresses people (input.to): what it sends cannot be taken back.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • outboundThe input takes a destination (input.to): what the tool writes goes there.

    Findings

    • Warn

      The server marks "verify_usdc_payment" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

      Matched text

      annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "verify_usdc_payment" says "payment": a word that usually means money moves, which cannot be taken back.

      What this check looks for
    Description, as the server wrote it
    Verify that a transaction paid at least N USDC to an address on Base or Arc (handles Arc native-USDC logs). Returns verified true/false, confirmations, matching transfers and reasons. Use it to confirm a customer paid before delivering. Costs $0.003 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
Changes things 3Claude Code: ask
  • address_profilePreflight any address on Base or Arc before paying or approving it: EOA vs contract vs EIP-7702-delegated wallet, EIP-1967 proxy implementation/admin, owner(), Safe multisig thresh…Reads text others writeNo findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Preflight any address on Base or Arc before paying or approving it: EOA vs contract vs EIP-7702-delegated wallet, EIP-1967 proxy implementation/admin, owner(), Safe multisig threshold, ERC-20 metadata, USDC + native balance, Sourcify verification, and risk flags. Costs $0.005 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • chainkit_catalogFree.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
    Description, as the server wrote it
    Free. Lists every ChainKit tool with its price, required inputs and an example, plus how x402 payment works. Call this first.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • usdc_balancesUSDC and native balance of one address on both Base and Arc in a single call.Reads text others writeNo findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    USDC and native balance of one address on both Base and Arc in a single call. Costs $0.002 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
Only reads 2Show 2 read-only tools
  • explain_transactionExplain a Base or Arc transaction in plain JSON: status, confirmations, fee, method selector, created contract, and every ERC-20 transfer decoded with symbol and decimals.Reads text others writeNo findings

    Why it is in this group

    • The name "explain_transaction" says "explain": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Explain a Base or Arc transaction in plain JSON: status, confirmations, fee, method selector, created contract, and every ERC-20 transfer decoded with symbol and decimals. Costs $0.004 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true
  • network_statusLive block height, gas price and fee estimates (transfer, ERC-20 transfer, contract call) for Base or Arc.Reads text others writeNo findings

    Why it is in this group

    • The name "network_status" says "status": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Live block height, gas price and fee estimates (transfer, ERC-20 transfer, contract call) for Base or Arc. On Arc fees are quoted directly in USDC. Costs $0.001 USDC on Base per call via x402 (unpaid calls return the x402 PaymentRequired; any x402 MCP client pays automatically).

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write5
Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
Can send data out1
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnverify_usdc_payment

    The server marks "verify_usdc_payment" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".

    Matched text

    annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "verify_usdc_payment" says "payment": a word that usually means money moves, which cannot be taken back.

    What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 1.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http chainkit https://northline-chainkit.northline-c86.workers.dev/mcp
claude mcp add --transport http chainkit https://northline-chainkit.northline-c86.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__chainkit__explain_transaction",
      "mcp__chainkit__network_status"
    ],
    "ask": [
      "mcp__chainkit__chainkit_catalog",
      "mcp__chainkit__address_profile",
      "mcp__chainkit__verify_usdc_payment",
      "mcp__chainkit__usdc_balances"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as chainkit. Review it before you use it.

Capability tags behind 5 rules
  • mcp__chainkit__address_profile untrusted-input
  • mcp__chainkit__verify_usdc_payment untrusted-input, outbound
  • mcp__chainkit__explain_transaction untrusted-input
  • mcp__chainkit__network_status untrusted-input
  • mcp__chainkit__usdc_balances untrusted-input

Pin

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/dev.workers.northline-c86.northline-chainkit/chainkit/verify?hash=90050de743bd5e9e996af66f7427d088793677e46ae4579d3595ee8d017402a9" | jq -e '.changed == false'

Pinned hash 90050de743bd, from Oct 27, 2026, 01:17 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/dev.workers.northline-c86.northline-chainkit/chainkit/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

anlyon.dev badge for dev.workers.northline-c86.northline-chainkit/chainkit
[![anlyon.dev](https://anlyon.dev/badge/dev.workers.northline-c86.northline-chainkit/chainkit.svg)](https://anlyon.dev/servers/dev.workers.northline-c86.northline-chainkit/chainkit)

Source: MCP Registry. Synced Oct 27, 2026, 01:17 UTC.