Can the A2A Gateway — Base Token Guard & x402 Settlement MCP server do things that cannot be undone?

No tool is classed as irreversible: none of them sends, pays, publishes or merges, going by their definitions.

Does the A2A Gateway — Base Token Guard & x402 Settlement MCP server need sign-in or OAuth?

Its remote endpoint listed its tools to an anonymous client, without sign-in.

Does the A2A Gateway — Base Token Guard & x402 Settlement MCP server send data to outside services?

None of its tools sends, posts or publishes, or takes a recipient, channel or URL.

A2A Gateway — Base Token Guard & x402 Settlement MCP server

trade.musefish.a2a/a2a-gatewaya2a.musefish.tradestreamable-httpv2.1.0Scanned 5 days ago

Free signup, 2 points, one command. Base token risk checks, route simulation, x402-paid.

7 tools: 1 can delete or cancel things, 5 change things and 1 only read.

Reads private data · 1
Reads text others write · 1
Can send data out · 0
No findings

Tools listed without sign-in. Remote posture

Anlyon alternative

6 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.dev 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 →

What the A2A Gateway — Base Token Guard & x402 Settlement MCP server can do

The A2A Gateway — Base Token Guard & x402 Settlement MCP server is published by a2a.musefish.trade, a domain the MCP Registry verified. It has 7 tools. It can delete or cancel things (1 tool: remove_image_background) and create or change data (5 tools: generate_a2a_invitation, check_base_token_safety, simulate_mev_route_safety, fast_code_audit and 1 more). 1 tool only reads.

1 tool reads private data (get_a2a_registration_protocol); 1 tool brings in text other people can write (get_a2a_registration_protocol).

None of the fixed checks matched anything in its tool definitions. That is not a safety guarantee.

Its remote endpoint lists its tools without sign-in.

Last scanned Nov 10, 2026, version 2.1.0.

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.

7 tools

Deletes or cancels 1Removes, cancels or revokes something.Claude Code: deny

remove_image_backgroundOne-click high-precision image background removal powered by local native PyTorch RMBG-1.4 model.No findings
Why it is in this group
- The name "remove_image_background" says "remove": a word for removing or ending something.
Description, as the server wrote it
One-click high-precision image background removal powered by local native PyTorch RMBG-1.4 model. Outputs clean transparent RGBA PNG (Base64). Completely standalone, zero ComfyUI dependency. Charges 0.01 USDC via x402 on Base Mainnet or eligible points. Supply payer_address. For redemption pass invoice_id and signature in _meta.x402/payment, with tx_hash for on-chain payment or method=points where supported. Settlement errors set isError and _meta.x402/payment-error.status_code; 503 indicates admission unavailable, while a 409 uncertain outcome must not be automatically retried.

Changes things 5Creates or changes something that can be changed back.Claude Code: ask

check_base_token_safetyCRITICAL PRE-TRADE SECURITY GATEWAY for Base tokens (ChainID 8453).No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
CRITICAL PRE-TRADE SECURITY GATEWAY for Base tokens (ChainID 8453). MUST be invoked before executing any DEX swap, trading bot order, or liquidity provision on Base. Detects rugpulls, honeypots, malicious mint functions, unrenounced ownership, and hidden blacklist traps via EVM bytecode disassembly. Returns dehydrated market depth, verified liquidity, buy/sell ratios, and on-chain security verdict. Charges 0.01 USDC via x402 on Base or eligible points. Input requires token contract hex address. Supply payer_address. For redemption pass invoice_id and signature in _meta.x402/payment, with tx_hash for on-chain payment or method=points where supported. Settlement errors set isError and _meta.x402/payment-error.status_code; 503 indicates admission unavailable, while a 409 uncertain outcome must not be automatically retried.
deep_protocol_reasoningDeep protocol architecture deconstruction and unconstrained logic deduction powered by local Qwen3.6-35B MoE.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
Deep protocol architecture deconstruction and unconstrained logic deduction powered by local Qwen3.6-35B MoE. Analyzes multi-contract interactions, flashloan constraints, and edge cases. Charges 0.10 USDC via x402 on Base or eligible points. Supply payer_address. For redemption pass invoice_id and signature in _meta.x402/payment, with tx_hash for on-chain payment or method=points where supported. Settlement errors set isError and _meta.x402/payment-error.status_code; 503 indicates admission unavailable, while a 409 uncertain outcome must not be automatically retried.
fast_code_auditZero-refusal, lightning-fast smart contract and code security audit powered by local Qwen3.5-9B.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
Zero-refusal, lightning-fast smart contract and code security audit powered by local Qwen3.5-9B. Identifies honeypots, malicious backdoors, reentrancy vulnerabilities, and transfer tax traps. Zero retention, completely ephemeral. Charges 0.02 USDC via x402 on Base. Supply payer_address. For redemption pass invoice_id and signature in _meta.x402/payment, with tx_hash for on-chain payment or method=points where supported. Settlement errors set isError and _meta.x402/payment-error.status_code; 503 indicates admission unavailable, while a 409 uncertain outcome must not be automatically retried.
generate_a2a_invitationRegister with one EIP-191 signature and SHA-256 proof of work.No findings
Why it is in this group
- The name "generate_a2a_invitation" says "generate": a word for a change.
Description, as the server wrote it
Register with one EIP-191 signature and SHA-256 proof of work. Call get_a2a_registration_protocol for the canonical message and current difficulty; optional inviter_code binds a referral.
simulate_mev_route_safetyEPH-02 CRITICAL PRE-EXECUTION SIMULATION GATEWAY for Flashloans & MEV routes on Base (ChainID 8453).No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it
EPH-02 CRITICAL PRE-EXECUTION SIMULATION GATEWAY for Flashloans & MEV routes on Base (ChainID 8453). Executes read-only EVM sandbox tracing before broadcasting real arbitrage or swap routes to mainnet. Detects hidden reverts, slippage traps, fee-on-transfer hooks, and gas bombs. Zero host OS privilege, strictly memory-isolated. Charges 1.50 USDC via x402 on Base. Supply payer_address. For redemption pass invoice_id and signature in _meta.x402/payment, with tx_hash for on-chain payment or method=points where supported. Settlement errors set isError and _meta.x402/payment-error.status_code; 503 indicates admission unavailable, while a 409 uncertain outcome must not be automatically retried.

Only reads 1Looks things up and changes nothing.Show 1 read-only tool

get_a2a_registration_protocolGet the canonical EIP-191 registration message and current proof-of-work difficulty.Reads private dataReads text others writeNo findings
Why it is in this group
- The name "get_a2a_registration_protocol" says "get": a word for reading.
What it can reach
- private-dataThe description's first sentence says "get" and "message": it reads messages.
- untrusted-inputThe description's first sentence says "get" and "message": it reads messages, which other people can write.
Description, as the server wrote it
Get the canonical EIP-191 registration message and current proof-of-work difficulty.

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 outbound.

Reads private data1: Reads files, mail, messages, databases, secrets, calendars or repositories.; get_a2a_registration_protocol
Reads text others write1: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; get_a2a_registration_protocol
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.

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Nov 10, 2026, 08:20 UTC, unchanged since Nov 10, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable: yes
HTTP status of an anonymous initialize: 200
tools/list served without credentials: yes
Tools that change things, listed without credentials: 6
Protocol version: 2025-03-26
WWW-Authenticate on 401: not observed
resource_metadata in WWW-Authenticate: not observed
RFC 9728 protected resource metadata: not observed
Authorization servers: not observed
Legacy HTTP+SSE transport: no
Dynamic client registration: not observed
Client ID metadata documents: not observed

HighThe whole server
The endpoint served tools/list without credentials, and the list has 6 tools that change things (1 destructive, 5 write). Whether a call also works without credentials was not tested: tools are never called.
Matched text
https://a2a.musefish.trade/mcp: tools/list returned 7 tools to an anonymous client, including remove_image_background (destructive), generate_a2a_invitation (write), check_base_token_safety (write), simulate_mev_route_safety (write), fast_code_audit (write) and 1 more
What this check looks for

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

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 2.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http a2a-gateway https://a2a.musefish.trade/mcp

claude mcp add --transport http a2a-gateway https://a2a.musefish.trade/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__a2a-gateway__get_a2a_registration_protocol"
    ],
    "ask": [
      "mcp__a2a-gateway__generate_a2a_invitation",
      "mcp__a2a-gateway__check_base_token_safety",
      "mcp__a2a-gateway__simulate_mev_route_safety",
      "mcp__a2a-gateway__fast_code_audit",
      "mcp__a2a-gateway__deep_protocol_reasoning"
    ],
    "deny": [
      "mcp__a2a-gateway__remove_image_background"
    ]
  }
}

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 a2a-gateway. Review it before you use it.

Capability tags behind 1 rule

mcp__a2a-gateway__get_a2a_registration_protocol private-data, 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/trade.musefish.a2a/a2a-gateway/verify?hash=5f9ab1602f88e141c7a4247fa6fdfe3fd8fb1498f7c1da84bd635a026b9cee8f" | jq -e '.changed == false'

Pinned hash 5f9ab1602f88, from Nov 10, 2026, 06:18 UTC.

Watch

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

https://anlyon.dev/servers/trade.musefish.a2a/a2a-gateway/changes.xml

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Badge

[![anlyon.dev](https://anlyon.dev/badge/trade.musefish.a2a/a2a-gateway.svg)](https://anlyon.dev/servers/trade.musefish.a2a/a2a-gateway)

Source: MCP Registry. Synced Nov 10, 2026, 14:18 UTC.