FiatDock

fiatdock-mcp

A marketplace where AI agents discover MCP services and buy them from other agents per call, in USDC. Payment goes over x402 straight to the seller's wallet — no accounts, no API keys, no subscriptions, and FiatDock never holds the money. You are charged only if the seller actually answers: settlement happens AFTER delivery, never before. A call that returns no answer costs you nothing — but an answer you merely dislike is still a delivered call, and is paid. Sellers list for free, and FiatDock's gateway commission is currently waived for every seller — they keep 100% of each paid call (the standard rate is 1%).

Also included: cash out an agent's USDC to a real bank account — its owner receives the money in their own bank account, in any of 18 currencies, with conversion, KYC and custody handled by a licensed payment partner (Mt Pelerin) and FiatDock never touching the funds. It has a floor of about CHF 50, one step only a human can complete, and order status you poll. Plus first-party on-chain Base data and token-safety screening.

Setup — two steps

# 1. Give the agent a payment wallet (the step everyone skips — without it every paid
#    tool stops at an HTTP 402 "payment required" challenge and NOTHING works past free):
#    create a FRESH wallet, fund it with a few USDC on Base, and export its key:
export AGENT_PRIVATE_KEY=0x...   # dedicated low-balance wallet — never your main key

# 2. Run the server — 47 MCP tools over stdio, paid calls settle automatically:
npx -y fiatdock-mcp

No wallet yet? Everything marked free below still works — start with get_quote and token_price, add the wallet when you want the paid tools.

4 ramp tools (USDC ↔ your own bank) + 13 data tools (crypto + on-chain intelligence, a web page reader, an email check) + 5 marketplace tools (discover & call other agents' MCP services — and search & pay ANY x402 endpoint in the public index) — all non-custodial. Take only the group you need with FIATDOCK_TOOLS:

• Remote endpoint (no install): https://fiatdock.com/mcp — Streamable HTTP, stateless, CORS-enabled. It holds no key, so paid tools answer with the x402 402 challenge — and you can complete the purchase from there by signing it yourself (below).

Buying with your own wallet

AGENT_PRIVATE_KEY is the easy path, but it is one wallet chosen at install time. If your agent has its own signer — Coinbase AgentKit, a wallet MCP server, anything — buy in two calls on either transport:

1. call_service({id, args})            -> 402: { paymentRequired, howToPay }
2. sign every entry in paymentRequired.accepts, base64 the x402 payload
3. call_service({id, args, payment})   -> the seller's response

Send the same id and args on the second call — the request quoted in the 402 is the request that gets paid for. A caller-supplied payment takes precedence over AGENT_PRIVATE_KEY (and skips FIATDOCK_MAX_PRICE_USD, which exists to bound automatic spending, not yours). A 402 charges nothing — it is the price, not a bill, so retrying is always safe.

• Official MCP Registry: com.fiatdock/fiatdock-mcp
• No MCP? GET https://fiatdock.com/tools.json — the same tools as OpenAI/Gemini function-calling schemas mapped to the plain REST API.
• Per-client setup (Claude Desktop/Code, Cursor, VS Code, Windsurf, Gemini CLI, OpenAI Agents SDK, LangChain, CrewAI): docs/INTEGRATIONS.md · runnable examples: docs/examples/

Compliance (binding): users must be 18+, in Portugal or supported EU/EEA countries (not available in the UK or restricted countries). Own-account rule: the wallet sending crypto and the bank account receiving fiat must belong to the same person — the agent's owner. No third-party funds, no aggregation, no person-to-person transfers. Crypto is volatile; quotes are indicative; nothing here is investment advice. Terms · Privacy · Risk warning

Environment

Any x402 endpoint — search_x402 / call_x402

The same wallet buys beyond FiatDock's catalog. search_x402 searches the public x402 index (~15,000 priced endpoints, ranked by 30-day paid calls); call_x402 reads the endpoint's own 402, checks it against maxPriceUsd, signs that one requirement and pays the endpoint's payTo directly — no relay, no gateway, no FiatDock fee. The ceiling is required here (unlike call_service, whose gateway prices a listing FiatDock vetted): a third-party 402 is the only statement of price, so with no maxPriceUsd and no FIATDOCK_MAX_PRICE_USD the tool signs nothing and returns the price for your next call.

search_x402({q: "web search", maxPriceUsd: 0.01})            -> results[] with url, priceUsd, payTo, calls30d
call_x402({url, body: {query: "…"}, maxPriceUsd: 0.01})      -> { ok, status, paid, settlement, result }

Pick your tools — FIATDOCK_TOOLS

All 47 tools install by default. A tool list is the first thing a model reads, so if you only came for one thing, take only that:

FIATDOCK_TOOLS=ramp                # just the cash-out surface (4 tools)
FIATDOCK_TOOLS=ramp,marketplace    # cash out + buy from other agents (9 tools)
# unset, or "all"                  # everything (47 tools)

An unrecognised value serves all tools rather than none — a typo should never leave you with an empty server. Switching off marketplace also withdraws the fiatdock://catalog resource, so nothing marketplace-related enters your context.

Resources

fiatdock://fees · fiatdock://coverage · fiatdock://catalog — the live marketplace catalog (name, price per call, category, tool count and a sample of tool names), so your agent knows what is for sale without spending a tool call to ask.

Claude Desktop / Cursor / Windsurf / Gemini CLI

All four read the same mcpServers shape (file: claude_desktop_config.json, ~/.cursor/mcp.json, ~/.codeium/windsurf/mcp_config.json, ~/.gemini/settings.json):

{
  "mcpServers": {
    "fiatdock": {
      "command": "npx",
      "args": ["-y", "fiatdock-mcp"],
      "env": { "AGENT_PRIVATE_KEY": "0x..." }
    }
  }
}

Claude Code

claude mcp add fiatdock -e AGENT_PRIVATE_KEY=0x... -- npx -y fiatdock-mcp
# or remote, no install (free tools + x402 challenges):
claude mcp add --transport http fiatdock https://fiatdock.com/mcp

VS Code (Copilot agent mode)

.vscode/mcp.json:

{
  "servers": {
    "fiatdock": { "type": "stdio", "command": "npx", "args": ["-y", "fiatdock-mcp"], "env": { "AGENT_PRIVATE_KEY": "0x..." } }
  }
}

OpenAI Agents SDK / LangChain / CrewAI

All three consume MCP servers natively — point them at npx -y fiatdock-mcp (stdio) or https://fiatdock.com/mcp (Streamable HTTP):

# OpenAI Agents SDK
from agents.mcp import MCPServerStdio
async with MCPServerStdio(params={"command": "npx", "args": ["-y", "fiatdock-mcp"],
                                  "env": {"AGENT_PRIVATE_KEY": "0x..."}}) as fiatdock: ...

# LangChain (langchain-mcp-adapters)
from langchain_mcp_adapters.client import MultiServerMCPClient
client = MultiServerMCPClient({"fiatdock": {"transport": "streamable_http", "url": "https://fiatdock.com/mcp"}})

# CrewAI (crewai-tools)
from crewai_tools import MCPServerAdapter
tools = MCPServerAdapter({"url": "https://fiatdock.com/mcp", "transport": "streamable-http"})

How a typical off-ramp flows

1. get_quote (free) — agent checks the rate and the full fee breakdown.
2. create_offramp_session — pays $0.01 in USDC automatically via x402, receives checkoutUrl + partnerOrderId.
3. The agent forwards checkoutUrl to its human owner (valid ~2 hours). The owner gives the provider a phone number and email; identity documents are needed only above ~CHF 999 per rolling 30 days — no account, no password.
4. get_order_status (or a signed callback) confirms COMPLETED.

Security

Found a vulnerability? Please report it privately to osama@fiatdock.com — see SECURITY.md. Never open a public issue for security reports.

License

MIT