All servers · Agent payments (x402) · Payments & accounting · Shops & products

Coal — Payments for AI agents

io.github.emmanuel39hanks/coal · v1.3.0

Measured by MCP Station

Description written by the publisher, not verified

Payment rails for AI agents. Pay merchants in USDC on Base. Dual-protocol: x402 + OKX APP.

Connect

claude mcp add --transport http coal https://mcp.usecoal.xyz/api/mcp

{
  "mcpServers": {
    "coal": {
      "url": "https://mcp.usecoal.xyz/api/mcp"
    }
  }
}

Tools as reported by the server

• discover_merchants
  THE DEFAULT FIRST CALL whenever the user wants to buy, get, fetch, grab, order, purchase, shop for, find, or browse anything (digital goods, ebooks, APIs, prompts, datasets). Returns a Markdown product grid with images, prices, and merchant payout addresses inline — so you can go straight to pay_mer
• search_products
  Search products across all Coal merchants. Filter by name, max price, or tag. Returns a Markdown product grid with images. Use this when looking for something specific like "find a figurine under $1".
• get_merchant_profile
  Get the full profile of a Coal merchant including products (with images), paywalls, supported networks/tokens, and 0G Storage proof. Returns rendered Markdown.
• query_merchant_memory
  Ask a natural language question about a merchant's products, policies, or catalog. Powered by 0G Compute with Sealed Inference (TEE). Needs a Coal API key — set once via Claude config header `X-Coal-Api-Key:YOUR_KEY`, or pass per-call as `coalApiKey`. Get one at https://usecoal.xyz/console/keys.
• check_paywall
  Check whether an address has paid for a specific x402 paywall. Returns pricing info if not paid, or content access status if paid.
• create_checkout
  Create a Coal checkout session to pay for a product or amount. Settles in USDC on Base (~2s). Returns a checkout URL. Needs a Coal API key — set once via Claude config header `X-Coal-Api-Key:YOUR_KEY`, or pass per-call as `coalApiKey`. Get one at https://usecoal.xyz/console/keys.
• get_checkout_status
  Check the payment status of a checkout session: pending, verifying, confirmed, expired, failed.
• verify_receipt
  Verify a payment receipt and see its 3-step proof trail: (1) Base TX, (2) 0G Storage receipt, (3) 0G Chain anchor.
• get_0g_health
  Check the live status of all 5 0G components: Storage, Chain, Compute, KV, DA.
• agent_wallet_status
  Check the USDC balance for your agent wallet (or any address). If `X-Coal-Agent-Key` is set in your Claude config header, this auto-resolves your wallet's address. Otherwise pass `address` or `agentPrivateKey`. The server holds NO long-lived keys — every payment is signed per-request.
• pay_merchant write/delete
  Send USDC on Base to any merchant payout address (the `payoutAddress` field shown by discover_merchants — NOT the merchantId). Use this whenever the user has confirmed they want to buy, purchase, pay, or send money for something. Gasless for you — Coal pays gas. Returns the on-chain tx hash. Auto-us
• download_product
  Retrieve / download / get the file for a digital product after the user paid for it. Use after `pay_merchant` succeeds for digital goods (PDFs, ebooks, cheatsheets, datasets). Pass the on-chain `txHash` from `pay_merchant` OR a Coal checkout `sessionId`. Returns a verified download URL the user can
• setup_instructions
  Print step-by-step instructions for using Coal MCP from Claude / Cursor / any MCP client. Run this FIRST if you are unsure how to authenticate or which credentials to provide.

Repository · Website · JSON · Text for agents · Registry updated 2026-05-07