# Block402 (remote · api.block402.xyz)

Bitcoin + Ethereum RPC for AI agents. 44 tools. x402 required; Base Sepolia test USDC.

- Trust score: 68/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-07

## Components

- remote · `api.block402.xyz`: 68/100 (this document), [markdown](https://verifymcp.io/servers/xyz-block402-block402/api.md), [page](https://verifymcp.io/servers/xyz-block402-block402/api)

## Channel facts

- Endpoint: `https://api.block402.xyz/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-07.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 80/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 4673 tokens (~99/item across 47 items; 44 tools + 3 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 10/100
  - Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 83/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 50% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 44 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 46 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Block402 MCP server?

Block402 is a hosted endpoint at https://api.block402.xyz/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

```json
{
  "mcpServers": {
    "xyz-block402-block402": {
      "url": "https://api.block402.xyz/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "xyz-block402-block402": {
      "type": "http",
      "url": "https://api.block402.xyz/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.xyz-block402-block402]
url = "https://api.block402.xyz/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "xyz-block402-block402": {
      "type": "remote",
      "url": "https://api.block402.xyz/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add xyz-block402-block402 --url 'https://api.block402.xyz/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  xyz-block402-block402:
    url: "https://api.block402.xyz/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "xyz-block402-block402": {
      "Transport": "http",
      "Url": "https://api.block402.xyz/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add xyz-block402-block402 -t streamable-http -u 'https://api.block402.xyz/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-07 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-06 (score 67, +2)

- [security improvement] Judged manipulation: unverified → pass
- [security] The server rewrote its instructions, which are the text every model session reads
- [security] Tool “bitcoin_getbestblockhash” rewrote its description, which is the text the model reads
- [security] Tool “bitcoin_getblock” rewrote its description, which is the text the model reads
- [security] Tool “bitcoin_getblockcount” rewrote its description, which is the text the model reads
- [security] Tool “bitcoin_getblockhash” rewrote its description, which is the text the model reads
- [security] Tool “bitcoin_getblockheader” rewrote its description, which is the text the model reads
- [security] Tool “bitcoin_getrawtransaction” rewrote its description, which is the text the model reads
- [security] Tool “bitcoin_gettxout” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_blobBaseFee” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_blockNumber” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_call” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_chainId” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_createAccessList” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_estimateGas” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_feeHistory” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_gasPrice” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getBalance” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getBlockByHash” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getBlockByNumber” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getBlockReceipts” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getBlockTransactionCountByHash” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getBlockTransactionCountByNumber” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getCode” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getLogs” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getProof” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getRawTransactionByBlockHashAndIndex” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getRawTransactionByBlockNumberAndIndex” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getRawTransactionByHash” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getStorageAt” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getTransactionByBlockHashAndIndex” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getTransactionByBlockNumberAndIndex” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getTransactionByHash” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getTransactionCount” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getTransactionReceipt” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getUncleByBlockHashAndIndex” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getUncleByBlockNumberAndIndex” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getUncleCountByBlockHash” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_getUncleCountByBlockNumber” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_maxPriorityFeePerGas” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_eth_syncing” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_net_listening” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_net_peerCount” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_net_version” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_web3_clientVersion” rewrote its description, which is the text the model reads
- [security] Tool “ethereum_web3_sha3” rewrote its description, which is the text the model reads
- [functional improvement] Stability: unverified → 0.07

### 2026-10-04 (score 65)

First indexed and scored.

## MCP tools (44)

### `bitcoin_getblockcount` (~111 tokens)

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

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `bitcoin_getbestblockhash` (~113 tokens)

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

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `bitcoin_getblockhash` (~111 tokens)

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

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `bitcoin_getblockheader` (~111 tokens)

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

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `bitcoin_getblock` (~109 tokens)

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

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `bitcoin_getrawtransaction` (~111 tokens)

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

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `bitcoin_gettxout` (~111 tokens)

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

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_chainId` (~98 tokens)

Read eth_chainId from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_blockNumber` (~98 tokens)

Read eth_blockNumber from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_syncing` (~98 tokens)

Read eth_syncing from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_net_version` (~96 tokens)

Read net_version from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_net_listening` (~98 tokens)

Read net_listening from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_net_peerCount` (~98 tokens)

Read net_peerCount from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_web3_clientVersion` (~100 tokens)

Read web3_clientVersion from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_gasPrice` (~100 tokens)

Read eth_gasPrice from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_maxPriorityFeePerGas` (~104 tokens)

Read eth_maxPriorityFeePerGas from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_blobBaseFee` (~100 tokens)

Read eth_blobBaseFee from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_web3_sha3` (~100 tokens)

Read web3_sha3 from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getBlockTransactionCountByNumber` (~106 tokens)

Read eth_getBlockTransactionCountByNumber from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getUncleCountByBlockNumber` (~108 tokens)

Read eth_getUncleCountByBlockNumber from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getBlockByNumber` (~102 tokens)

Read eth_getBlockByNumber from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getTransactionByBlockNumberAndIndex` (~108 tokens)

Read eth_getTransactionByBlockNumberAndIndex from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getUncleByBlockNumberAndIndex` (~110 tokens)

Read eth_getUncleByBlockNumberAndIndex from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getRawTransactionByBlockNumberAndIndex` (~110 tokens)

Read eth_getRawTransactionByBlockNumberAndIndex from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getBlockTransactionCountByHash` (~106 tokens)

Read eth_getBlockTransactionCountByHash from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getUncleCountByBlockHash` (~108 tokens)

Read eth_getUncleCountByBlockHash from Ethereum (eip155:1). Costs 0.002500 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getBlockByHash` (~102 tokens)

Read eth_getBlockByHash from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getTransactionByBlockHashAndIndex` (~108 tokens)

Read eth_getTransactionByBlockHashAndIndex from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getUncleByBlockHashAndIndex` (~110 tokens)

Read eth_getUncleByBlockHashAndIndex from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getRawTransactionByBlockHashAndIndex` (~110 tokens)

Read eth_getRawTransactionByBlockHashAndIndex from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getBalance` (~96 tokens)

Read eth_getBalance from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_getTransactionCount` (~98 tokens)

Read eth_getTransactionCount from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_getCode` (~96 tokens)

Read eth_getCode from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_getStorageAt` (~98 tokens)

Read eth_getStorageAt from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_getTransactionByHash` (~102 tokens)

Read eth_getTransactionByHash from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getTransactionReceipt` (~100 tokens)

Read eth_getTransactionReceipt from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getRawTransactionByHash` (~104 tokens)

Read eth_getRawTransactionByHash from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_feeHistory` (~96 tokens)

Read eth_feeHistory from Ethereum (eip155:1). Costs 0.005000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_call` (~94 tokens)

Read eth_call from Ethereum (eip155:1). Costs 0.010000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_estimateGas` (~98 tokens)

Read eth_estimateGas from Ethereum (eip155:1). Costs 0.010000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_createAccessList` (~98 tokens)

Read eth_createAccessList from Ethereum (eip155:1). Costs 0.010000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_getProof` (~96 tokens)

Read eth_getProof from Ethereum (eip155:1). Costs 0.010000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (required)

### `ethereum_eth_getLogs` (~98 tokens)

Read eth_getLogs from Ethereum (eip155:1). Costs 0.010000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

### `ethereum_eth_getBlockReceipts` (~102 tokens)

Read eth_getBlockReceipts from Ethereum (eip155:1). Costs 0.010000 USDC on Base mainnet (eip155:8453). Preserve the private idempotencyKey for retries.

Input parameters:

- `idempotencyKey` (string, required): Private random 32-byte lowercase hex recovery key. Persist before payment and reuse only for retries of this same method and params. Never publish it.
- `params` (array, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/xyz-block402-block402/api#diagnostics

## Score history

- 2026-10-07: 68
- 2026-10-06: 67
- 2026-10-04: 65

## Common questions

### What is the Block402 MCP server?

Block402 is an MCP server listed in the public MCP registry as xyz.block402/block402. Bitcoin + Ethereum RPC for AI agents. 44 tools. x402 required; Base Sepolia test USDC. This page covers its hosted endpoint (https://api.block402.xyz/mcp).

### Is the Block402 MCP server safe to use?

Block402 scores 68 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Block402 MCP server expose?

Block402 exposes 44 tools: bitcoin_getblockcount, bitcoin_getbestblockhash, bitcoin_getblockhash, bitcoin_getblockheader, bitcoin_getblock, and 39 more. Their descriptions and schemas cost roughly 4,531 tokens of context every time the server is loaded.

### Does the Block402 MCP server require authentication?

No. We connected to Block402 without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Block402 MCP server still maintained?

Block402 is still listed as active in the MCP registry. We last reached this channel on 7 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://api.block402.xyz/mcp
- Website: https://block402.xyz/
- Changelog RSS feed: https://verifymcp.io/servers/xyz-block402-block402/api.xml
- Changelog JSON feed: https://verifymcp.io/servers/xyz-block402-block402/api.json
- HTML version of this page: https://verifymcp.io/servers/xyz-block402-block402/api