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Onward Flights

by onward.flights · remote · no sign-in to list tools · v1.0.0 · published by flights.onward

Search real flights and buy an onward ticket (proof of onward travel), paid in USDC over MPP

Changes · 1
CompareRegistry entry

3 tools: 1 change things and 2 only read.

Scanned Oct 21, 2026

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http onward-flights https://onward.flights/mcp

Findings

Matches of fixed checks, with the text they matched.

1 info
  • Infobuy_ticket

    The description mentions "credential".

    Matched text

    description: "...again with tx_hash and chain (or an MPP credential in _meta "org.paymentauth/credential")...."

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Changes things 1Claude Code: ask
  • buy_ticketBuy the ticket for a flight from search_flights, paid in USDC.1 finding

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.

    Findings

    • Info

      The description mentions "credential".

      Matched text

      description: "...again with tx_hash and chain (or an MPP credential in _meta "org.paymentauth/credential")...."

      What this check looks for
    Description, as the server wrote it
    Buy the ticket for a flight from search_flights, paid in USDC. Call it first without payment to get the price, wallet address and MPP challenges. After sending the USDC, call it again with tx_hash and chain (or an MPP credential in _meta "org.paymentauth/credential"). x402 clients can instead sign one of the offers in error.data.x402 and retry with the PaymentPayload in _meta "x402/payment", with no gas needed. Returns the ticket link and PDF.

    Annotations the server declares

    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
Only reads 2Claude Code: allow
  • find_airportsLook up 3 letter IATA airport codes by city, airport or country name.No findings

    Why it is in this group

    • The name "find_airports" says "find": a word for reading.
    Description, as the server wrote it
    Look up 3 letter IATA airport codes by city, airport or country name.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: false
  • search_flightsFind one-way flights to use as an onward ticket.No findings

    Why it is in this group

    • The name "search_flights" says "search": a word for reading.
    Description, as the server wrote it
    Find one-way flights to use as an onward ticket. Returns up to 10 flights, each with an id to buy and its price in USD.

    Annotations the server declares

    • readOnlyHint: true
    • openWorldHint: true

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.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http onward-flights https://onward.flights/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__onward-flights__find_airports",
      "mcp__onward-flights__search_flights"
    ],
    "ask": [
      "mcp__onward-flights__buy_ticket"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as onward-flights. Review it before you use it.