quartermaster

x402 toolkit for AI agents: paid web, AI, and Base chain tools per call in USDC.

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What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    x402 toolkit for AI agents: paid web, AI, and Base chain tools per call in USDC. Free tools too.

    How to connect

    How to connect quartermaster to Claude

    The server address to paste into Claude settings:

    https://quartermaster.surewhynot.app/mcp

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    How to connect quartermaster to ChatGPT

    The server address to paste into ChatGPT settings:

    https://quartermaster.surewhynot.app/mcp

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    How to connect quartermaster to Cursor

    The server address to paste into Cursor settings:

    https://quartermaster.surewhynot.app/mcp

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    Server tool list (49)

    Raw names from tools/list. Only developers need these.

    x402_routerSTART HERE. One tool for anything x402, Base chain, or web/AI: describe your goal in plain English (q) and Quartermaster picks and runs the right underlying tool, returning the answer plus which tool it used. Examples: 'audit https://api.example.com/paid', 'price of eth', 'is 0x… a contract', 'verify settlement 0x…', 'search the bazaar for weather'. Use this when you don't want to choose among the individual tools below. Costs $0.03 (USDC via x402).
    web_extract[Web] Extract clean readable text and metadata from a public webpage as structured JSON. Costs $0.005 (USDC via x402).
    page_meta[Web] Get page metadata: title, description, Open Graph, canonical URL, favicon, language. Costs $0.002.
    qr_generate[Web] Generate a QR code as SVG (or terminal text with format=text). Costs $0.002.
    dns_lookup[Web] Resolve DNS records over DNS-over-HTTPS (A, AAAA, CNAME, MX, NS, TXT, and more). Costs $0.001.
    http_error_explain[Web] Explain an HTTP status code: meaning, common causes, fixes, retry guidance. Costs $0.001.
    tx_status[Crypto/Base] Check a Base transaction: success/reverted/pending, confirmations, gas, explorer link. Costs $0.002. Choose this for a quick raw status; use payment_receipt for decoded transfers, or settlement_assurance to PROVE an x402 payment settled to the right wallet/amount.
    wallet_balance[Crypto/Base] ETH and USDC (or any ERC-20) balance for an address on Base. Costs $0.001.
    gas_prices[Crypto/Base] Current Base gas prices with a simple-transfer cost estimate. Costs $0.001.
    summarize_url[AI] AI summary of a public webpage (fetch + extract + summarize). length: short|medium|long. Costs $0.01.
    translate_text[AI] AI translation into any target language; source auto-detected. Costs $0.005.
    tldr_text[AI] Summarize raw text you pass in directly (not a URL). length: short|medium|long. Costs $0.005. Use summarize_url when you have a URL instead.
    classify_text[AI] Zero-shot classification of text into caller-supplied labels; the result is validated back into your label set so you can route on it. Costs $0.002.
    unshorten_url[Web] Expand a shortened/redirecting URL: follow the redirect chain and return every hop plus the final destination. Each hop is SSRF-validated. Costs $0.002. Safe way to see where an untrusted link goes.
    regex_test[Dev] Test a regular expression against text; returns every match with numbered and named capture groups. Deterministic. Costs $0.001.
    random_numbers[Dev] Cryptographically-secure random integers in a range (CSPRNG, unbiased) — real entropy an LLM cannot produce itself. Costs $0.001.
    random_pick[Dev] Pick one or several options at random from a caller-supplied list (CSPRNG), optionally without replacement. Costs $0.001.
    http_check[Web] Liveness/latency pre-flight for a URL: is it up, HTTP status and class, response latency in ms, whether it redirects and where, content-type and server. Costs $0.001. Use before relying on a dependency.
    public_holiday[Dev] Is a date a public holiday in a country (2-letter ISO code)? Returns the holiday name, its types, and the next upcoming holiday. Costs $0.001. Useful for scheduling.
    x402_inspect[x402] Inspect and lint any x402 paid endpoint: decode the 402 challenge, identify network/asset, flag misconfigurations and Bazaar-readiness. Costs $0.002. Choose this for a quick one-shot decode+lint; use x402_audit for a full 0-100 scored report with origin discovery probes and recommended fixes.
    x402_simulate[x402] Pre-flight a payment BEFORE you spend: decode an endpoint's 402 challenge, report the cost on every rail (Base and Solana) and the cheapest, and — with an optional payer address — verify the wallet can afford the call on Base. Costs $0.003. Use this before paying an unfamiliar endpoint; use x402_inspect to lint an endpoint you own.
    tx_decode[Crypto/Base] Decode a Base transaction's calldata into the function it called and its arguments — ERC-20 transfer/approve and the EIP-3009 transferWithAuthorization used by x402 settlements. Recognizes x402 settlement transactions and formats USDC amounts. Costs $0.003. Use tx_status for pass/fail; use this to see WHAT a transaction did.
    embed_text[AI] Text embeddings (1024-dim vector) for semantic search and RAG. Costs $0.002.
    extract_structuredStructured extraction: JSON Schema plus a URL or raw text in, matching JSON out. Costs $0.005.
    moderate_text[AI] Content-safety classification (Llama Guard): safe flag plus category codes. Costs $0.002.
    describe_image[AI] AI vision: describe a public image URL, including visible text. Costs $0.005.
    token_price[Crypto/Base] USD price for major tokens by symbol or any Base ERC-20 by address. Costs $0.001.
    payment_receipt[x402] Formatted settlement receipt for a Base transaction (0x hash) or Solana settlement (base58 signature): timestamp, decoded transfers, explorer link. Costs $0.002. Choose this for a human-readable record; use payment_proof to ASSERT a specific payTo/amount, or settlement_assurance for a full scored verdict.
    resolve_basenameResolve a Basename (.base.eth) to a wallet address on Base. Costs $0.001.
    x402_audit[x402] WORKFLOW: full scored audit of an x402 SELLER endpoint (a URL) in one call - verifies the 402 challenge, payment fields, Bazaar discovery metadata, and the origin's discovery surfaces; returns a 0-100 score, checks with evidence, and recommended fixes. Costs $0.01. Use this to grade an endpoint before trusting/publishing it; use settlement_assurance instead when you already have a transaction hash and want to prove a completed PAYMENT settled correctly.
    payment_proof[x402] Verify an x402 settlement on Base OR Solana from a tx id (0x hash or base58 signature): confirm it succeeded, decode its USDC transfers, optionally assert payTo/amount - returns a single verdict. Costs $0.003. Choose this when you only need the yes/no did-it-land answer; use settlement_assurance for the full scored report (proof + receipt + optional endpoint audit).
    settlement_assurance[x402] FLAGSHIP: from a tx id on Base (0x hash) or Solana (base58 signature), prove a completed x402 payment is real and sound - onchain success, USDC transfer match to an expected wallet/amount, a receipt, and an optional audit of the issuing endpoint - as one 0-100 scored report with a verdict. Costs $0.03. This is the most complete post-payment check; use payment_proof if you only need a plain pass/fail, tx_status for raw status, or x402_audit to grade a seller endpoint by URL (no payment yet).
    x402_discover[x402] Search the Coinbase x402 Bazaar for paid resources by natural-language query. Costs $0.001.
    x402_merchant[x402] List all x402 Bazaar resources under a merchant payTo wallet. Costs $0.001.
    usdc_normalizeConvert USDC amounts between atomic units and human decimals. Costs $0.001.
    base_token_infoERC-20 name, symbol, decimals, total supply for a token on Base. Costs $0.001.
    base_allowanceCheck an ERC-20 spending allowance on Base; flags unlimited approvals. Costs $0.001.
    base_contractDetermine whether a Base address is a contract or an EOA. Costs $0.001.
    base_usdc_transfersRecent USDC transfers (in and out) for an address on Base. Costs $0.002.
    jwt_decode[Dev] Decode a JWT header and payload (signature NOT verified). Costs $0.001.
    base64[Dev] Base64 encode or decode a string. Costs $0.001.
    text_stats[Dev] Word/sentence counts, reading time, and readability score for text. Costs $0.001.
    text_diff[Dev] Compact line-level diff between two texts. Costs $0.001.
    x402_test_vector[x402] Free: example x402 payment-requirement objects with field explanations.
    current_timeFREE (no wallet needed): current time as ISO, unix, UTC, and optional local time for an IANA timezone.
    generate_uuidFREE (no wallet needed): generate UUID v4 values, up to 100 at once.
    hash_stringFREE (no wallet needed): SHA-1/256/384/512 hex digest of a string.
    http_errors_listFREE (no wallet needed): index of documented HTTP status codes (use http_error_explain for a paid detailed explanation).
    quartermaster_infoFree: catalog, prices, and payment instructions for this server.