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402MCP

ChatGPT plugin

Decode HTTP 402 payments

View in ChatGPT directory

402MCP helps developers and agents work with HTTP 402 Payment Required.

When an API answers with a 402, 402MCP identifies the payment scheme (L402, x402 v1/v2 or the Machine Payments Protocol), decodes the invoice, macaroon or payment requirements, and returns the exact steps and header needed to pay and retry. It flags expired challenges, macaroons that do not match their invoice, and every field the server controls.

When you are choosing how an agent should pay, or how an API should charge agents, 402MCP recommends a payment rail from your stated requirements (payment size, settlement asset, custody, infrastructure and network) and explains every trade-off and exclusion. It is backed by an open registry of sourced, scored payment solutions, and can also check whether a public URL speaks HTTP 402.

Limitations: 402MCP is read-only. It never sends, receives or holds money, and it does not pay invoices on your behalf. Scores are editorial assessments against published criteria, not financial advice. No account is needed.

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Movement

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Rank by placement

#10087of 10,70429places down24h—7d
#9,976#10,007#10,038#10,069Oct 4Oct 10Oct 16Oct 22Oct 28Nov 2

Rank in Developer tools

#800of 8661places down24h—7d
#795#797#799Oct 4Oct 10Oct 16Oct 22Oct 28Nov 2

In its category

How this plugin compares with others in the same category. Positions are counted within the category, not across the whole directory.

Developer tools800th of 866 by placement
#PluginPosition7d
798DechoNet#9976—
799ZRouter#10077—
800402MCPThis page#10087—
801manpage.ai#10110—
802Local Commander#10120—

All 866 Developer tools plugins

Example prompts

  • “My API call returned 402 Payment Required. What does it want and how do I pay?”
  • “Which payment rail fits an API charging agents a tenth of a cent per call in USDC?”
  • “Explain the difference between L402, x402 and MPP.”
Categories
Made by
Blokhaus Inc · Website
Sign-in
On Install
Capabilities
Decode HTTP 402 payment challenges, Recommend a payment rail from requirements, Search a registry of agent payment solutions, Explain the L402, x402 and MPP wire formats, Check whether a URL speaks HTTP 402
Availability
Available
Version
1.1.1
Keywords
http-402, payments, l402, x402, mpp, agents, developer-tools
Created
October 16, 2026
More info
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