# io.github.89rat/code402-verify-mcp (remote · verify.code402.dev)

Verify code402 XDR-1 receipts: keccak digest + secp256k1 signer recovery. Free, stateless.

- Trust score: 73/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `verify.code402.dev`: 73/100 (this document), [markdown](https://verifymcp.io/servers/89rat-code402-verify-mcp/verify.md), [page](https://verifymcp.io/servers/89rat-code402-verify-mcp/verify)

## Channel facts

- Endpoint: `https://verify.code402.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.2.0`

## 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 2026-11-05.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 18 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - 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**: 79/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1240 tokens (~68/item across 18 items; 18 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 40/100
  - Stability observed for 12 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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 18 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 18 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 io.github.89rat/code402-verify-mcp server?

io.github.89rat/code402-verify-mcp is a hosted endpoint at https://verify.code402.dev/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 89rat-code402-verify-mcp 'https://verify.code402.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "89rat-code402-verify-mcp": {
      "url": "https://verify.code402.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "89rat-code402-verify-mcp": {
      "type": "http",
      "url": "https://verify.code402.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.89rat-code402-verify-mcp]
url = "https://verify.code402.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "89rat-code402-verify-mcp": {
      "type": "remote",
      "url": "https://verify.code402.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add 89rat-code402-verify-mcp --url 'https://verify.code402.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  89rat-code402-verify-mcp:
    url: "https://verify.code402.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "89rat-code402-verify-mcp": {
      "Transport": "http",
      "Url": "https://verify.code402.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add 89rat-code402-verify-mcp -t streamable-http -u 'https://verify.code402.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "89rat-code402-verify-mcp": {
      "type": "http",
      "url": "https://verify.code402.dev/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.

### 2026-11-04 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 69, +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.

### 2026-10-25 (score 68, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-24 (score 67)

First indexed and scored.

## MCP tools (18)

### `x402_verify` (~85 tokens)

Verify one or more XDR-1 signed receipts offline (free). Returns valid/invalid per receipt with signer recovery, declared signer comparison, and integrity digest. Supply raw_receipt as JSON string or array for batch.

Input parameters:

- `raw_receipt` (string, required): Full signed receipt JSON (single object or JSON array for batch)
- `settlement_asset` (string): Default USDC

### `price_lookup` (~86 tokens)

Look up pricing for any code402 tool (free). Returns current x402 pricing tiers, accepted networks, and tool availability. Use tool_name for named lookups or url for URL-based lookups.

Input parameters:

- `tool_name` (string): Tool name (e.g. iban_check, bundle_verify, chain_block_number)
- `url` (string): Full endpoint URL to look up pricing for

### `iban_check` (~81 tokens)

Paid ($0.0029). Validate an IBAN: ISO 13616 structure, country registration, length, MOD 97-10 checksum. Returns pass/fail with all checks and issues. Covers 50 countries.

Input parameters:

- `iban` (string, required): IBAN to validate (e.g. GB29NWBK60161331926819, spaces allowed)

### `sanctions_check` (~77 tokens)

Paid ($0.0029). Screen Ethereum addresses and entity names against OFAC/UN/EU sanctions lists. Returns clear/hit with matched entries. Supports both EVM addresses and human-readable names.

Input parameters:

- `addresses` (array): EVM addresses to screen (0x-prefixed)
- `names` (array): Entity names to screen

### `onchain_address_check` (~90 tokens)

Paid ($0.0029). Validate an EVM address format and EIP-55 mixed-case checksum. Returns valid/invalid with normalization and checksum status.

Input parameters:

- `address` (string, required): 0x-prefixed EVM address to validate (e.g. 0x742d35Cc6634C0532925a3b844Bc9e7595f2bD18)

### `lei_check` (~82 tokens)

Paid ($0.0029). Validate a Legal Entity Identifier (LEI, ISO 17442). Checks 20-char alphanumeric format and Mod 97-10 check character. Verified via Rust WASM engine.

Input parameters:

- `lei` (string, required): 20-character LEI (e.g. 5493001KJTIIGC8Y1R12)

### `luhn_check` (~73 tokens)

Paid ($0.0029). Validate a payment card or account number using the Luhn algorithm (ISO/IEC 7812-1). Checks numeric format and Mod-10 checksum. Verified via Rust WASM engine.

Input parameters:

- `number` (string, required): Card or account number (12-19 digits, spaces allowed)

### `mod97_check` (~83 tokens)

Paid ($0.0029). Calculate ISO 7064 Mod 97-10 remainder for any alphanumeric string. Returns the remainder (0-96, valid=1). Used for IBAN, LEI, and custom identifier validation. Verified via Rust WASM engine.

Input parameters:

- `input` (string, required): Alphanumeric string to compute Mod 97-10 on

### `bundle_verify` (~127 tokens)

Paid ($0.0029–$0.50). Multi-gate compliance bundle: run any combination of IBAN validation, sanctions screening, and EVM address validation in a single call. Returns all gate results + XDR-1 signed receipt. Tier auto-detected from field count.

Input parameters:

- `iban` (string): IBAN to validate
- `onchain_address` (string): EVM address to validate
- `sanctions` (object): Sanctions screening: { addresses: string[], names: string[] }
- `tier` (string): Pricing tier (auto-detected if omitted)

### `chain_block_number` (~31 tokens)

Paid ($0.0029). Get the latest Ethereum mainnet block number. Returns block height and timestamp.

### `chain_balance` (~46 tokens)

Paid ($0.0029). Get native ETH balance of any Ethereum address. Returns balance in wei and ETH.

Input parameters:

- `address` (string, required): 0x-prefixed EVM address

### `chain_erc20_balance` (~69 tokens)

Paid ($0.0029). Get ERC-20 token balance via balanceOf. Returns balance in raw and human-readable form.

Input parameters:

- `address` (string, required): 0x-prefixed wallet address
- `token` (string, required): 0x-prefixed ERC-20 token contract address

### `chain_nonce` (~40 tokens)

Paid ($0.0029). Get the next transaction nonce for an Ethereum address.

Input parameters:

- `address` (string, required): 0x-prefixed EVM address

### `chain_tx` (~54 tokens)

Paid ($0.008). Get Ethereum transaction details by hash. Returns from, to, value, gas used, status, block info.

Input parameters:

- `hash` (string, required): 0x-prefixed 64-hex transaction hash

### `chain_ens_resolve` (~48 tokens)

Paid ($0.008). Resolve a .eth ENS name to its Ethereum address via the universal resolver.

Input parameters:

- `name` (string, required): ENS name (e.g. vitalik.eth)

### `chain_gas_price` (~48 tokens)

Paid ($0.0029). Get the current Ethereum mainnet gas price. Returns base fee, priority fee, and max fee in wei and gwei. Useful for estimating transaction costs.

### `chain_tx_receipt` (~59 tokens)

Paid ($0.008). Get the receipt of a confirmed transaction. Returns status (success/fail), gas used, logs, contract address if deployment.

Input parameters:

- `hash` (string, required): 0x-prefixed 64-hex transaction hash

### `chain_code` (~61 tokens)

Paid ($0.0029). Get the deployed bytecode at an address. Returns hex bytecode (empty = EOA, non-empty = contract). Useful for distinguishing contracts from wallets.

Input parameters:

- `address` (string, required): 0x-prefixed EVM address

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/89rat-code402-verify-mcp/verify#diagnostics

## Score history

- 2026-11-05: 73
- 2026-11-04: 73
- 2026-11-03: 72
- 2026-11-02: 72
- 2026-11-01: 71
- 2026-10-31: 71
- 2026-10-30: 70
- 2026-10-29: 70
- 2026-10-28: 69
- 2026-10-27: 69
- 2026-10-26: 68
- 2026-10-25: 68
- 2026-10-24: 67

## Common questions

### What is the io.github.89rat/code402-verify-mcp server?

io.github.89rat/code402-verify-mcp is listed in the public MCP registry as io.github.89rat/code402-verify-mcp. Verify code402 XDR-1 receipts: keccak digest + secp256k1 signer recovery. Free, stateless. This page covers its hosted endpoint (https://verify.code402.dev/mcp).

### Is the io.github.89rat/code402-verify-mcp server safe to use?

io.github.89rat/code402-verify-mcp scores 73 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 io.github.89rat/code402-verify-mcp server expose?

io.github.89rat/code402-verify-mcp exposes 18 tools: x402_verify, price_lookup, iban_check, sanctions_check, onchain_address_check, and 13 more. Their descriptions and schemas cost roughly 1,240 tokens of context every time the server is loaded.

### Does the io.github.89rat/code402-verify-mcp server require authentication?

No. We connected to io.github.89rat/code402-verify-mcp without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the io.github.89rat/code402-verify-mcp server still maintained?

io.github.89rat/code402-verify-mcp is still listed as active in the MCP registry. We last reached this channel on 5 November 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://verify.code402.dev/mcp
- Changelog RSS feed: https://verifymcp.io/servers/89rat-code402-verify-mcp/verify.xml
- Changelog JSON feed: https://verifymcp.io/servers/89rat-code402-verify-mcp/verify.json
- HTML version of this page: https://verifymcp.io/servers/89rat-code402-verify-mcp/verify