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citable-mcp

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citable-mcp

MCP server for Citable — SEO and AI-visibility data an agent can buy by the call. Each tool pays for itself in USDC on Solana over x402 from a wallet on your machine: no account, no API key, no subscription. $0.005–0.30 per call, and a failed call is never charged.

The code that signs those payments is in this repo — server.ts is the whole server.

Install

claude mcp add citable -- npx -y citable-mcp     # Claude Code
codex mcp add citable -- npx -y citable-mcp      # Codex

Cursor, Claude Desktop, or any MCP client — mcp.json:

{
  "mcpServers": {
    "citable": {
      "command": "npx",
      "args": ["-y", "citable-mcp"],
      "env": { "CITABLE_MAX_PRICE": "0.30" }
    }
  }
}

Node ≥ 20.18, or bunx citable-mcp.

Related MCP server: Santos Automation

Wallet

Start with citable_prices — it reports the wallet, its balance, and how to fund it. Two ways:

  • Sign in, no crypto needed. citable_connect returns a link: sign in at citable.run with Google or email, add a few dollars, click Connect. The agent then pays from that wallet.

  • Keypair, if you already use Solana. With nothing configured the server creates ~/.config/citable/agent.json on first need and shows the address. Send it USDC on Solana — no SOL required, the x402 facilitator covers the network fee — or point CITABLE_WALLET at a funded keypair.

Walkthrough: https://citable.run/docs/wallet

Config

Env

Default

Meaning

CITABLE_WALLET

~/.config/citable/agent.json

keypair JSON path, or the JSON byte array itself, holding mainnet USDC. Created when first needed

CITABLE_MAX_PRICE

0.30

refuse any single call priced above this many USD; nothing is signed

CITABLE_API

https://citable.run

base URL

Tools

Tool

Price

Returns

citable_prices

free

endpoints, prices, wallet, balance, spend cap — call this first

citable_connect

free

a sign-in link for funding without touching crypto

citable_keyword_suggest

$0.005

autocomplete expansions and questions for a seed

citable_serp

$0.008

the Google results page for a keyword

citable_onpage_audit

$0.01

citability score for one URL, 20 checks, ordered fixes

citable_rank_check

$0.012

where a domain ranks on Google for a keyword, plus the top 10

citable_keyword_metrics

$0.03

volume, CPC, competition, difficulty and intent for 1–20 keywords

citable_domain_overview

$0.03

a domain's organic footprint: keywords ranked, top positions, traffic

citable_domain_history

$0.03

that footprint month by month

citable_domain_keywords

$0.04

the keywords a domain ranks for, with month-over-month movement

citable_keyword_ideas

$0.05

related keywords for a seed, with volume and difficulty

citable_ai_visibility

$0.05/engine

which AI engines cite a domain for your question, and who they cite instead

citable_keyword_research

$0.06

one seed → keywords and questions, merged and priced

citable_backlinks

$0.10

backlink totals, referring domains, domain rank

citable_ai_mentions_trend

$0.18

monthly AI mentions for a domain, with the trend

citable_ai_share_of_voice

$0.18

2–10 domains compared inside the AI-answer index

citable_top_cited_pages

$0.22

the domain's pages AI answers cite most

citable_cited_prompts

$0.25

the real questions AI engines already cite a domain for

citable_citability_report

$0.30

audit + AI visibility + top cited pages in one call ($0.43 apart)

Every paid result carries _payment.transaction, the on-chain settlement. A call above the cap, or without funds, returns a structured error and pays nothing.

How a call works

  1. The tool requests the endpoint. Citable answers 402 with the price, the USDC mint and the pay-to address.

  2. The server signs a USDC transfer for exactly that amount — only if it is at or below CITABLE_MAX_PRICE — and retries with the payment header.

  3. The facilitator settles on Solana in about 400 ms and the endpoint returns 200.

The keypair is read from disk and used only to sign these transfers. Nothing else leaves your machine, and Citable stores nothing about you: the wallet is the only identity.

Build

bun install
bun build.ts        # → dist/server.js, the published bin

MIT.

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