PipRail

io.github.piprail/mcpv0.9.0Finance & Payments

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

In-path gate · all MCP tools

Using PipRail in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire

Auditable install path →Watch it hold a drift →

Trust verdict · v1 advisory · method

REVIEWstatus: PARTIALfresh until 2026-08-21 04:01 UTC

screened 2026-07-22tier: scannedgranularity: description-levelsource: registry

Semantic screen found no manipulation pattern in the description. Conformance probe not yet run.

mcpindex.integrity.descriptionpassINFO

evidence“No malicious instructions found”via static_description

Limits of this verdict

- Semantic screen only - the deterministic conformance probe has not run on this server
- Confidence is reported but not yet calibrated (v1)
- Screen reads the tool description, not the live behavior
- advisory
- registry description only no input schema
- screen model 8b

Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-07-22).

Contracts can change after screening, with no version bump. The gate pins PipRail’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

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A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.

Markdown

[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-piprail-mcp)](https://mcpindex.ai/server/io-github-piprail-mcp)

HTML

<a href="https://mcpindex.ai/server/io-github-piprail-mcp"><img src="https://mcpindex.ai/api/v1/badge/io-github-piprail-mcp" alt="mcpindex verdict" height="20" /></a>

Environment variables

PIPRAIL_PRIVATE_KEY

secret

Your 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_CHAIN

Chain to pay on (default: base).

PIPRAIL_CHAINS

Pay 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_AMOUNT

Max spend per single payment, in token units (default: 0.10).

PIPRAIL_MAX_TOTAL

Lifetime spend cap per token, in token units (default: 10.00).

PIPRAIL_MAX_TOTAL_DENOM

Cross-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_PAYMENTS

Lifetime cap on the NUMBER of payments, across every chain + token (e.g. 100).

PIPRAIL_MAX_PAYMENTS_PER_WINDOW

Cap on the number of payments within PIPRAIL_WINDOW_SECONDS (a rolling rate limit; set PIPRAIL_WINDOW_SECONDS too).

PIPRAIL_WARN_AT_FRACTION

Emit 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_LOG

Path 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_LOG

Mirror payment events (settled / declined / budget-threshold) as one-line JSON to 'stderr' or a file path — the operator's notification stream. Default: off.

PIPRAIL_TOKENS

Comma-separated allowed token symbols, plus the alias 'native' for the chain's coin (default: USDC).

PIPRAIL_SCHEMES

Comma-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.

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

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Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@piprail/mcp"
      ],
      "env": {
        "PIPRAIL_PRIVATE_KEY": "<your-piprail_private_key>",
        "PIPRAIL_CHAIN": "<piprail_chain>",
        "PIPRAIL_CHAINS": "<piprail_chains>",
        "PIPRAIL_MAX_AMOUNT": "<piprail_max_amount>",
        "PIPRAIL_MAX_TOTAL": "<piprail_max_total>",
        "PIPRAIL_MAX_TOTAL_DENOM": "<piprail_max_total_denom>",
        "PIPRAIL_MAX_PAYMENTS": "<piprail_max_payments>",
        "PIPRAIL_MAX_PAYMENTS_PER_WINDOW": "<piprail_max_payments_per_window>",
        "PIPRAIL_WARN_AT_FRACTION": "<piprail_warn_at_fraction>",
        "PIPRAIL_SPEND_LOG": "<piprail_spend_log>",
        "PIPRAIL_EVENT_LOG": "<piprail_event_log>",
        "PIPRAIL_TOKENS": "<piprail_tokens>",
        "PIPRAIL_SCHEMES": "<piprail_schemes>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@piprail/mcp"
      ],
      "env": {
        "PIPRAIL_PRIVATE_KEY": "<your-piprail_private_key>",
        "PIPRAIL_CHAIN": "<piprail_chain>",
        "PIPRAIL_CHAINS": "<piprail_chains>",
        "PIPRAIL_MAX_AMOUNT": "<piprail_max_amount>",
        "PIPRAIL_MAX_TOTAL": "<piprail_max_total>",
        "PIPRAIL_MAX_TOTAL_DENOM": "<piprail_max_total_denom>",
        "PIPRAIL_MAX_PAYMENTS": "<piprail_max_payments>",
        "PIPRAIL_MAX_PAYMENTS_PER_WINDOW": "<piprail_max_payments_per_window>",
        "PIPRAIL_WARN_AT_FRACTION": "<piprail_warn_at_fraction>",
        "PIPRAIL_SPEND_LOG": "<piprail_spend_log>",
        "PIPRAIL_EVENT_LOG": "<piprail_event_log>",
        "PIPRAIL_TOKENS": "<piprail_tokens>",
        "PIPRAIL_SCHEMES": "<piprail_schemes>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y @piprail/mcp

Claude Code (claude mcp add)

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

Gemini CLI (gemini mcp add)

gemini mcp add -s user mcp npx -y @piprail/mcp

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-piprail-mcp

Free-tier verdict as JSON: decision + dimensions + severity. Call it from your agent before it invokes a tool it just discovered.

Details

version: v0.9.0
category: Finance & Payments
verdict expires: 2026-08-21
quality: 90 / 100
operator: piprail

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? Email us →

Provenance

Verdict history is anchored to Bitcoin via OpenTimestamps. The anchor proof is public and any skeptic can recompute it offline.

Links

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