Identifier Validator + Stablecoin Peg Verdict

dev.workers.yuechenxi-importexport.identifier-validator-api/identifier-validatoridentifier-validator-api.yuechenxi-importexport.workers.devstreamable-httpv1.0.0Scanned 59 minutes ago

Offline IBAN/BIC/EU VAT/card/ISBN/GTIN validators + live USD stablecoin peg-health verdict.

8 tools: 2 change things and 6 only read.

Reads private data · 0
Reads text others write · 1
Can send data out · 0
1 finding

Anlyon alternative

2 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 →

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.

8 tools

Changes things 2Creates or changes something that can be changed back.Claude Code: ask

stablecoin_peg_verdictLive peg-health verdict for USD stablecoins: PEGGED / WATCH / DEPEG_RISK / DEPEGGED, 0-100 risk score, price deviation in bps, 1d/7d/30d supply change and per-chain liquidity, comp…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
Live peg-health verdict for USD stablecoins: PEGGED / WATCH / DEPEG_RISK / DEPEGGED, 0-100 risk score, price deviation in bps, 1d/7d/30d supply change and per-chain liquidity, computed from DefiLlama (cached 5 min). Free tier: 30 calls/hour per client; for unlimited use pay per call via x402 (USDC on Base, $0.005): https://identifier-validator-api.yuechenxi-importexport.workers.dev/x402/v1/stablecoin-peg. Informational only, not financial advice.
Annotations the server declares
- title: Stablecoin peg verdict
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: false
- openWorldHint: true
validate_gtinValidate GTIN-8/12/13/14 (EAN/UPC barcode) check digit.1 finding
Why it is in this group
- The name "validate_gtin" says "validate": a word for reading.
- The input takes a statement or command to run (input.code), which can change anything it can reach.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "validate_gtin" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "validate_gtin" says "validate": a word for reading.
  What this check looks for
Description, as the server wrote it
Validate GTIN-8/12/13/14 (EAN/UPC barcode) check digit.
Annotations the server declares
- title: Validate GTIN/EAN/UPC
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

Only reads 6Looks things up and changes nothing.Show 6 read-only tools

validate_batchValidate up to 25 mixed identifiers (iban, bic, vat, card, isbn, gtin) in one call.No findings
Why it is in this group
- The name "validate_batch" says "validate": a word for reading.
Description, as the server wrote it
Validate up to 25 mixed identifiers (iban, bic, vat, card, isbn, gtin) in one call.
Annotations the server declares
- title: Validate many identifiers
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
validate_bicValidate a BIC/SWIFT code structure (8 or 11 chars), country, location and branch code.No findings
Why it is in this group
- The name "validate_bic" says "validate": a word for reading.
Description, as the server wrote it
Validate a BIC/SWIFT code structure (8 or 11 chars), country, location and branch code.
Annotations the server declares
- title: Validate BIC/SWIFT
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
validate_cardLuhn check and network detection (Visa, Mastercard, Amex, Discover, Diners, JCB, UnionPay, Maestro, Mir).No findings
Why it is in this group
- The name "validate_card" says "validate": a word for reading.
Description, as the server wrote it
Luhn check and network detection (Visa, Mastercard, Amex, Discover, Diners, JCB, UnionPay, Maestro, Mir). Returns masked output only; nothing is stored.
Annotations the server declares
- title: Validate payment card number
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
validate_ibanValidate an IBAN offline: country rules, length, BBAN structure, mod-97 checksum.No findings
Why it is in this group
- The name "validate_iban" says "validate": a word for reading.
Description, as the server wrote it
Validate an IBAN offline: country rules, length, BBAN structure, mod-97 checksum. Returns validity, country, SEPA flag and formatted IBAN. Structural check only: cannot tell whether the account exists.
Annotations the server declares
- title: Validate IBAN
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
validate_isbnValidate ISBN-10 or ISBN-13 check digit and convert between the two.No findings
Why it is in this group
- The name "validate_isbn" says "validate": a word for reading.
Description, as the server wrote it
Validate ISBN-10 or ISBN-13 check digit and convert between the two.
Annotations the server declares
- title: Validate ISBN
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false
validate_vatValidate an EU/EEA (plus GB, NO, CH and more) VAT number format and checksum offline.No findings
Why it is in this group
- The name "validate_vat" says "validate": a word for reading.
Description, as the server wrote it
Validate an EU/EEA (plus GB, NO, CH and more) VAT number format and checksum offline. Does not check VIES registration status.
Annotations the server declares
- title: Validate EU VAT number
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: false

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 or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write1: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; stablecoin_peg_verdict
Can send data out0: 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

Warnvalidate_gtin
The server marks "validate_gtin" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "validate_gtin" says "validate": a word for reading.
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 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http identifier-validator https://identifier-validator-api.yuechenxi-importexport.workers.dev/mcp

claude mcp add --transport http identifier-validator https://identifier-validator-api.yuechenxi-importexport.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__identifier-validator__validate_iban",
      "mcp__identifier-validator__validate_bic",
      "mcp__identifier-validator__validate_vat",
      "mcp__identifier-validator__validate_card",
      "mcp__identifier-validator__validate_isbn",
      "mcp__identifier-validator__validate_batch"
    ],
    "ask": [
      "mcp__identifier-validator__validate_gtin",
      "mcp__identifier-validator__stablecoin_peg_verdict"
    ],
    "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 identifier-validator. Review it before you use it.

Capability tags behind 1 rule

mcp__identifier-validator__stablecoin_peg_verdict untrusted-input

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.yuechenxi-importexport.identifier-validator-api/identifier-validator/verify?hash=75049db4098ebf49717fa6e408ac7f2cce9a7d60767a45766cf4c6f2a0e95246" | jq -e '.changed == false'

Pinned hash 75049db4098e, from Oct 31, 2026, 09:18 UTC.

Watch

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

https://anlyon.dev/servers/dev.workers.yuechenxi-importexport.identifier-validator-api/identifier-validator/changes.xml

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Badge

[![anlyon.dev](https://anlyon.dev/badge/dev.workers.yuechenxi-importexport.identifier-validator-api/identifier-validator.svg)](https://anlyon.dev/servers/dev.workers.yuechenxi-importexport.identifier-validator-api/identifier-validator)

Source: MCP Registry. Synced Oct 31, 2026, 09:17 UTC.