Pay MCP server

by vauban.tech·tech.vauban/pay-mcp·v0.19.0

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x402 pay tools for MCP clients, plus a `buy` command: read the offer, consent, pay. Starknet, Base.

C55/100grade C

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C55/100

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Adoption

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878 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Pay tools

No tool declarations could be read from the package source. They show once the server is installed.

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How Pay compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 55/100; higher than 10% of 48,243 servers
Downloads a week: 878; more than 94% of 12,306 servers with a package

Release history: 2 versions in the registry since 2026-09-08, latest 2026-10-23, typically one every 45 days.

Install Pay in Claude Code, Cursor or VS Code

Runs npx -y @vauban-pay/mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add pay-mcp -- npx -y @vauban-pay/mcp

Add to Cursor

Pay: common questions

Is Pay MCP server safe?: With care: it is graded C, so read the findings first (55/100). Read the Pay safety report
How do I install Pay?: It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Pay need an API key?: Yes. The registry entry asks for PAY_MCP_SEPOLIA_PRIVATE_KEY, PAY_MCP_STANDARD_X402_PRIVATE_KEY.
Is Pay maintained?: The latest release is v0.19.0.
How does Pay compare with other MCP servers?: safety score 55/100 (higher than 10% of 48,243 servers); downloads a week 878 (more than 94% of 12,306 servers with a package). Full comparison.

Run it through the gateway

Local package. It runs on your machine, not through the gateway.

Rating: —
Safety grade: C · 55/100
Stars: –
Downloads/wk: 878
Price: Free
Licence: Apache-2.0
Transport: Local · npm
Version: 0.19.0
Category: Everything else
Last release: —

Credentials it needs

STARKNET_RPC_URLStarknet RPC endpoint. Optional. The buy command contacts no node unless you name one (a Starknet mainnet node; the chain it serves must then be the offer's). The chain-reading tools default to a public node not operated by Vauban.
PAY_MCP_SEPOLIA_ACCOUNT_ADDRESSStarknet Sepolia account address for make_payment signer mode. Optional; without it make_payment uses the sponsored mode, which calls the sponsor over the network and settles a real Sepolia transfer it funds.
PAY_MCP_SEPOLIA_PRIVATE_KEYsecretPrivate key for that account. Optional; never required to try the tools.
PAY_MCP_STANDARD_X402_PAYEESStandard x402 path (Starknet): comma-separated payTo addresses pay_for_resource may pay. Empty pays nobody (fail closed). * pays any payee: avoid it.
PAY_MCP_STANDARD_X402_MAX_WEIStandard x402 path: cap on one payment in atomic units (default 0.1 STRK).
PAY_MCP_STANDARD_X402_ACCOUNT_ADDRESSStandard x402 path: a signer of its own (falls back to PAY_MCP_SEPOLIA_*).
PAY_MCP_STANDARD_X402_PRIVATE_KEYsecretPrivate key for that account. Optional.
PAY_MCP_EVM_KEYSTORE_PATHEVM path: path to your Web3 Secret Storage v3 keystore. Never a key in the environment.
PAY_MCP_EVM_PASSWORD_PATHEVM path: path to the file holding that keystore's password.
PAY_MCP_EVM_NETWORKSEVM path: comma-separated CAIP-2 networks pay_for_resource may pay on, e.g. eip155:84532. Empty pays nothing (fail closed).
PAY_MCP_EVM_PAYEESEVM path: comma-separated payTo addresses pay_for_resource may pay. Empty pays nobody (fail closed). * pays any payee, up to the session cap: avoid it.
PAY_MCP_EVM_MAX_PER_PAYMENTEVM path: cap on one payment, in atomic units of the asset (1000000 = 1 USDC). No default: unset refuses.
PAY_MCP_EVM_MAX_PER_SESSIONEVM path: cap on the total value of the signed authorizations this process hands over, per network and asset, never credited back. No default: unset refuses.
PAY_MCP_EVM_I_ACCEPT_MAINNET_SPENDEVM path: comma-separated CAIP-2 value networks you consent to spend real money on, each named (e.g. eip155:8453). Required for any network other than Base Sepolia and Ethereum Sepolia.
PAY_MCP_EVM_ASSETSEVM path: comma-separated <CAIP-2>/<token address> entries payable. Default: the network's known USDC only.

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