Skip to content
Block402 logo

Block402 MCP server

Which MCP servers are Block402's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-26

← Back to Block402

Whose server it is
  • Registry namexyz.block402/block402verified in the MCP registry

The registry name sits under block402.xyz. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-26
  • Stateanswerschecked 2026-10-26
  • Tools7
  • Server calls itselfblock402
  • Server version0.1.0
  • Protocol version2025-06-18

On 2026-10-26 the server answered initialize and tools/list without a sign-in. First answer in 279 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 1 of the 7 days it takes to judge reliability.

Once connected

  • Parameters are untyped or undescribed in 7 of 7 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 1, the first on 2026-10-27
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 1 so far
  • Answeredmeasuring1 of the 7 daily checks it takes to print a share
  • Median first answer310 ms
  • Space in an agent's context≈ 1,306 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 7 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 7 of 7

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers7 tools · read 2026-10-26
  • bitcoin_getblockcount

    Read getblockcount from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

  • bitcoin_getbestblockhash

    Read getbestblockhash from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

  • bitcoin_getblockhash

    Read getblockhash from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

  • bitcoin_getblockheader

    Read getblockheader from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

  • bitcoin_getblock

    Read getblock from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

  • bitcoin_getrawtransaction

    Read getrawtransaction from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

  • bitcoin_gettxout

    Read gettxout from Bitcoin (bip122:000000000019d6689c085ae165831e93). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "block402": {
      "type": "http",
      "url": "https://api.block402.xyz/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

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

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://api.block402.xyz/mcp as a custom connector in the settings.

OpenAPI spec

1 paths, read 2026-10-26. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.