Block402

by block402.xyz · remote · no sign-in to list tools · v0.1.1 · published by xyz.block402

Bitcoin + Ethereum RPC for AI agents. 44 tools. x402 payments in USDC on Base mainnet.

Changes · 7

Compare Registry entry

7 tools: 7 change things.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things7Claude Code: ask: see these tools
Only reads0Claude Code: allow

7 checks matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http block402 https://api.block402.xyz/mcp

Findings

Matches of fixed checks, with the text they matched.

7 warn

Warnbitcoin_getblockcount
The server marks "bitcoin_getblockcount" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
What this check looks for
Warnbitcoin_getbestblockhash
The server marks "bitcoin_getbestblockhash" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
What this check looks for
Warnbitcoin_getblockhash
The server marks "bitcoin_getblockhash" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
What this check looks for
Warnbitcoin_getblockheader
The server marks "bitcoin_getblockheader" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
What this check looks for
Warnbitcoin_getblock
The server marks "bitcoin_getblock" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
What this check looks for
Warnbitcoin_getrawtransaction
The server marks "bitcoin_getrawtransaction" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
What this check looks for

Show 1 more finding

Warnbitcoin_gettxout
The server marks "bitcoin_gettxout" as not read-only (readOnlyHint: false), and its words say it reads.
Matched text
annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

7 tools

Changes things 7Creates or changes something that can be changed back.Claude Code: ask

bitcoin_getbestblockhashRead getbestblockhash from Bitcoin (bip122:000000000019d6689c085ae165831e93).1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
Findings
- Warn
  The server marks "bitcoin_getbestblockhash" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
  What this check looks for
Description, as the server wrote it
Read getbestblockhash from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
bitcoin_getblockRead getblock from Bitcoin (bip122:000000000019d6689c085ae165831e93).1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
Findings
- Warn
  The server marks "bitcoin_getblock" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
  What this check looks for
Description, as the server wrote it
Read getblock from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
bitcoin_getblockcountRead getblockcount from Bitcoin (bip122:000000000019d6689c085ae165831e93).1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
Findings
- Warn
  The server marks "bitcoin_getblockcount" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
  What this check looks for
Description, as the server wrote it
Read getblockcount from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
bitcoin_getblockhashRead getblockhash from Bitcoin (bip122:000000000019d6689c085ae165831e93).1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
Findings
- Warn
  The server marks "bitcoin_getblockhash" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
  What this check looks for
Description, as the server wrote it
Read getblockhash from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
bitcoin_getblockheaderRead getblockheader from Bitcoin (bip122:000000000019d6689c085ae165831e93).1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
Findings
- Warn
  The server marks "bitcoin_getblockheader" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
  What this check looks for
Description, as the server wrote it
Read getblockheader from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
bitcoin_getrawtransactionRead getrawtransaction from Bitcoin (bip122:000000000019d6689c085ae165831e93).1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
Findings
- Warn
  The server marks "bitcoin_getrawtransaction" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
  What this check looks for
Description, as the server wrote it
Read getrawtransaction from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
bitcoin_gettxoutRead gettxout from Bitcoin (bip122:000000000019d6689c085ae165831e93).1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
- The server marks it as not read-only (readOnlyHint: false).
Findings
- Warn
  The server marks "bitcoin_gettxout" as not read-only (readOnlyHint: false), and its words say it reads.
  Matched text
  annotations: {"readOnlyHint":false,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "read": a word for reading.
  What this check looks for
Description, as the server wrote it
Read gettxout from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.
Annotations the server declares
- readOnlyHint: false
- destructiveHint: false
- idempotentHint: 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.

Install

Pinned to version 0.1.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http block402 https://api.block402.xyz/mcp

Run in a terminal.

Claude Code permissions

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

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__block402__bitcoin_getblockcount",
      "mcp__block402__bitcoin_getbestblockhash",
      "mcp__block402__bitcoin_getblockhash",
      "mcp__block402__bitcoin_getblockheader",
      "mcp__block402__bitcoin_getblock",
      "mcp__block402__bitcoin_getrawtransaction",
      "mcp__block402__bitcoin_gettxout"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as block402. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/xyz.block402/block402/changes.xml

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

Anlyon alternative

7 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 other servers for the same product.

Source: MCP Registry. Synced Oct 21, 2026, 18:55 UTC.

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