PipRail MCP server

by piprail·io.github.piprail/mcp·v0.10.0

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Budget-bound x402 payment wallet for AI agents — pays HTTP 402 URLs, capped locally. No backend.

B82/100grade B

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Safety scan

B82/100

full report

Adoption

Growing

9 stars82 downloads/wk

Reviews

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

PipRail tools

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

Public scan report

scanner v0.1.9 · 2026-09-19 · same rubric, same numbers if you re-run it

no findings

Code scan6 source files scanned25/25
–Live reliabilityno gateway calls yet and no remote to proben/a
–Tool poisoningtools not inspected (local package is not executed); not countedn/a
Auth qualitystatic API keys via environment variables6/15
Maintenancelast push 9 days ago15/15
Maintainer identityregistry namespace matches repository owner7/10

Overall 82/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

Install directly

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

claude mcp add mcp -- npx -y @piprail/mcp

Add to Cursor

PipRail: common questions

Is PipRail MCP server safe?: Mostly: it is graded B (82/100). Read the PipRail safety report
How do I install PipRail?: It runs on your machine. Copy the Claude Code, Claude Desktop or Cursor config from the install section.
Does PipRail need an API key?: Yes. The registry entry asks for PIPRAIL_PRIVATE_KEY.
Is PipRail maintained?: The last commit was 9 days ago (2026-09-10). The latest release is v0.10.0.
What can I use instead of PipRail?: Servers from other publishers that do the same job: POPCORN MCP server, IronWallet MCP server and X402 Data Gateway MCP server. Compare all PipRail alternatives.

Alternatives to PipRail

Same job from other publishers: the closest match first, then the best rated.

All PipRail alternatives →

POPCORN MCP
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X402 Data Gateway
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gate402 merchant checkout
Drop-in x402 checkout for merchants: issue terms, verify payment. $0.01 each.
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AgentIndex
Trust scores and on-chain payment receipts for x402 services.
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PipRail vs POPCORN MCP PipRail vs IronWallet PipRail vs X402 Data Gateway

Run it through the gateway

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

Rating: —
Safety grade: B · 82/100
Stars: 9
Downloads/wk: 82
Price: Free
Licence: MIT
Transport: Local · npm
Version: 0.10.0
Category: Finance
Last release: 2026-09-10

Credentials it needs

PIPRAIL_PRIVATE_KEYsecretYour wallet's private key/seed for the chosen chain. Optional: omit it to run read-only (discover/quote/register/budget/guide); set it to let the agent pay. Stays on your machine; the spend policy caps every payment.
PIPRAIL_CHAINChain to pay on (default: base).
PIPRAIL_CHAINSPay across several chains (instead of PIPRAIL_CHAIN): a comma-separated list, e.g. base,polygon,solana. Give each its own PIPRAIL_<CHAIN>_KEY (+ optional PIPRAIL_<CHAIN>_RPC_URL). The agent pays whichever chain a 402 asks for — the first listed that can settle — under one shared budget.
PIPRAIL_MAX_AMOUNTMax spend per single payment, in token units (default: 0.10).
PIPRAIL_MAX_TOTALLifetime spend cap per token, in token units (default: 10.00).
PIPRAIL_MAX_TOTAL_DENOMCross-token GRAND TOTAL: one spend cap per denomination across every stablecoin and chain, e.g. USD:20.00,EUR:5.00. Not a price oracle — sums tokens of the same unit, each counted 1:1. Native coins are excluded.
PIPRAIL_MAX_PAYMENTSLifetime cap on the NUMBER of payments, across every chain + token (e.g. 100).
PIPRAIL_MAX_PAYMENTS_PER_WINDOWCap on the number of payments within PIPRAIL_WINDOW_SECONDS (a rolling rate limit; set PIPRAIL_WINDOW_SECONDS too).
PIPRAIL_WARN_AT_FRACTIONEmit an early-warning event when spend crosses this fraction of any cap, e.g. 0.8 (80%). Needs PIPRAIL_EVENT_LOG to be visible.
PIPRAIL_SPEND_LOGPath to a local append-only spend log. When set, the budget (lifetime, grand total, counts) SURVIVES a restart — hydrated from this file. No backend; you own the file.
PIPRAIL_EVENT_LOGMirror payment events (settled / declined / budget-threshold) as one-line JSON to 'stderr' or a file path — the operator's notification stream. Default: off.
PIPRAIL_TOKENSComma-separated allowed token symbols, plus the alias 'native' for the chain's coin (default: USDC).
PIPRAIL_SCHEMESComma-separated payment schemes to settle (default: onchain-proof). Add 'exact' (onchain-proof,exact) to also pay standard x402 servers GASLESS on EVM + Solana (method auto-selected). Add 'upto' to also pay metered x402 servers on EVM (Permit2): sign a MAX, the server settles the actual <= max.

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