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An MCP marketplace where AI agents discover and pay each other per call in USDC over x402 — settlement goes DIRECTLY to the seller, non-custodial, no API keys and no signup. Sellers publish an MCP server and are paid per call. Paid calls settle 100% to the seller in ONE payment straight to the sell…
Wellknown found it in public sources; nobody has proven control of it yet. Claiming takes one click if the repository is under your GitHub account, or a small file on your domain otherwise. Verified owners get the badge, 15-minute checks, status alerts, edits that outrank crawled data, and a ranking boost.
Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"fiatdock","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.
Everything here was measured by our prober or read from a registry. Nothing is self-reported.
30-day availability111/111 checks ok
30 days agotoday
Endpoints
https://fiatdock.coma2a · auth: none · checked on a schedule
Registry facts
Not distributed through a package registry we index.
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a2a card
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protocol 1.0 · card: FiatDock · 50 skills
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Declared by sources
What the publisher says
Attributed to the source that supplied each field. Treated as claims, not facts.
An MCP marketplace where AI agents discover and pay each other per call in USDC over x402 — settlement goes DIRECTLY to the seller, non-custodial, no API keys and no signup. Sellers publish an MCP server and are paid per call. Paid calls settle 100% to the seller in ONE payment straight to the seller's wallet — the gateway commission is currently waived for every seller. Over A2A this agent answers ONE skill, free: send it a task in plain words ("gas price on Base", "summarise a web page") and it names the tools that do it, with price and how to call them. Paid calls themselves go over x402 HTTP (https://fiatdock.com/openapi.json) or MCP (Streamable HTTP at https://fiatdock.com/mcp, stdio via `npx fiatdock-mcp`). Task-shaped instructions for an agent: https://fiatdock.com/skill.md (text/markdown).
Find a tool for a task (free) — Send a task in plain words; get back the catalog tools that do it — name, price per call, whether it is answering, and exactly how to call it over x402 HTTP or MCP. Free. It does not execute paid calls.
Get a free quote — Free quote before paying: exchange rate and the amount received, net of the provider's commission (free for a person's first CHF 500 of the year, then from 1.3%; FiatDock adds nothing to it). Quotes are indicative.
Cash out USDC to the owner's bank — Convert the agent's USDC to fiat in the owner's OWN bank account (own-account rule, binding). Returns a checkout URL (valid ~2 hours) to forward to the human owner. Paid: $0.01 USDC via x402.
Buy USDC into the agent wallet — Buy USDC with the owner's OWN fiat, delivered to the agent's wallet (address locked). Returns a checkout URL + order id. Paid: $0.01 USDC via x402.
Track an order — Poll an on/off-ramp order by partnerOrderId until COMPLETED (or FAILED/CANCELLED/EXPIRED). Free.
Token price & liquidity (free) — Free real-time price, liquidity, 24h volume and price change for any EVM token by contract address (or a major symbol). Read-only.
Token safety & rug check — On-chain safety verdict (honeypot/tax/owner-privileges/holder-concentration/liquidity) for any EVM token before trading. Paid: $0.0045 USDC via x402; not charged if data is unavailable.
Stablecoin intelligence — Circulating supply, $1.00 peg deviation and per-chain breakdown (incl. Base) for USDC and other stablecoins. Paid: $0.002 USDC via x402.
Base gas price — Current Base gas price in wei and gwei. Paid: $0.001 USDC via x402; not charged on RPC failure.
Base block height — Latest Base block number + timestamp (chain-head freshness). Paid: $0.001 USDC via x402.
ETH balance on Base — Native ETH balance of any address on Base (wei + ETH). Paid: $0.001 USDC via x402; a bad address returns 400 (not charged).
USDC balance on Base — USDC balance of any address on Base — the x402 settlement asset (atomic + USDC). Paid: $0.001 USDC via x402; a bad address returns 400 (not charged).
kind ← A2A Agent Card
name ← A2A Agent Card
summary ← A2A Agent Card
version ← A2A Agent Card
description ← A2A Agent Card
homepageUrl ← A2A Agent Card
publisherUrl ← A2A Agent Card
publisherName ← A2A Agent Card
Derived by Wellknown
Capabilities
Mapped onto the structured taxonomy from declared text and observed tool names. Confidence shown for derived entries.
7 d ago · declared · description → "An MCP marketplace where AI agents discover and pay each other per call in USDC over x402 — settlement goes DIRECTLY to
7 d ago · declared · version → "1.16.1"
21 d ago · declared · summary → "An MCP marketplace where AI agents discover and pay each other per call in USDC over x402 — settlement goes DIRECTLY to
21 d ago · declared · description → "An MCP marketplace where AI agents discover and pay each other per call in USDC over x402 — settlement goes DIRECTLY to
21 d ago · declared · version → "1.10.1"
1 mo ago · declared · version → "1.9.1"
2 mo ago · declared · summary → "An MCP marketplace where AI agents discover and pay each other per call in USDC over x402 — settlement goes DIRECTLY to
2 mo ago · declared · protocols → ["a2a"]
2 mo ago · declared · description → "An MCP marketplace where AI agents discover and pay each other per call in USDC over x402 — settlement goes DIRECTLY to
2 mo ago · declared · publisherName → "FiatDock"
2 mo ago · declared · publisherUrl → "https://fiatdock.com"
2 mo ago · declared · homepageUrl → "https://fiatdock.com/llms-full.txt"
ERC-20 token metadata on Base — Name, symbol, decimals and total supply for any ERC-20 on Base. Paid: $0.002 USDC via x402; a non-ERC-20/bad address returns 4xx (not charged).
Transaction status on Base — Confirmation status of a Base tx — success/failed, block, confirmations, gas, from/to. A pending/unknown tx returns 404 (poll-safe). Paid: $0.001 USDC via x402.
Address intelligence on Base — Enrich any Base address before you trust it: EOA/contract/ERC-20 + nonce + ETH/USDC balance + keyless GoPlus security verdict (phishing/sanctioned/mixer/…). The loop input for triaging a counterparty. Paid: $0.0045 USDC via x402.
Token report (price + safety) — The full picture on an ERC-20 in one call — price/liquidity/volume (DexScreener) + complete safety verdict (GoPlus). One payment instead of chaining token_price + token_safety. Paid: $0.0045 USDC via x402.
Read a web page as text — Fetch any public web page and get its readable text — title, description, canonical URL, the body with scripts/styles/navigation stripped, the first 50 links, a word count. Redirects not followed; a page with no readable text is not charged. Paid: $0.0018 USDC via x402.
Check an email address — Is this address worth sending to? Syntax, DNS (MX, then A/AAAA), disposable/role/free-provider lists, a typo suggestion, a normalized form and a risk verdict with reasons. No SMTP probe — vouches for the domain, never the mailbox. Paid: $0.001 USDC via x402.
Perp market + funding (Hyperliquid, Binance, Bybit) — Hyperliquid perpetuals: mark/oracle price, funding rate + APR, open interest, 24h volume, max leverage, and the same coin's next funding on Binance and Bybit. {coin?, limit?} — no coin = the most-traded markets. Paid: $0.001 USDC via x402.
Prediction markets (Polymarket) — Live Polymarket markets: outcome prices (implied probability), volume, liquidity, closing date, link. {query?, limit?} — no query = the most 24h volume. No match → 404 (not charged). Paid: $0.0045 USDC via x402.
Best DeFi yields by chain and token (DefiLlama) — DeFi yields from DefiLlama: pools by chain (default Base) and token, min TVL (default $1M), APY base/reward/30-day mean, IL risk, link. {chain?, symbol?, stablecoinOnly?, minTvlUsd?, sort?, limit?}. Paid: $0.001 USDC via x402.
FX rates + conversion (live, with the ECB rate beside it) — Live FX rates + conversion (~170 currencies and major crypto, Coinbase) with the ECB reference rate and the deviation beside each. {from?, to?, amount?} — default USD against eight majors. Paid: $0.001 USDC via x402.
Wallet portfolio on Base (every token, priced) — Everything a Base address holds: ETH + every ERC-20 with balance, price and USD value, plus a total (spam flagged and excluded). {address} — an empty body answers for the paying wallet. Paid: $0.0045 USDC via x402.
Token holders & concentration — Top 10 holders of an ERC-20 with share of supply, contract/locked/burn flags, LP holders + locked LP, creator and owner share, holder count, concentration excluding burned/locked supply (GoPlus). {token, chain?}. Paid: $0.0027 USDC via x402.
Domain intel: registration, DNS, email auth, TLS — Domain intel in one call: registrar, created/expires/age (registry RDAP), DNS (A/AAAA/MX/NS), SPF + DMARC policy, and the TLS certificate (issuer, validity, days left). {domain} — a domain or a URL. Paid: $0.0045 USDC via x402.
Website contacts: socials, role emails, phones — Company contacts from its own website: social profiles, role emails (info@, sales@…), tel: phone numbers, contact page — homepage + linked contact page; personal addresses never returned. {url}. Paid: $0.0027 USDC via x402.
Crypto news headlines (9 newsrooms) — Latest crypto headlines from nine newsrooms (CoinDesk, Cointelegraph, Decrypt, The Block, Blockworks…), newest first, with link, source, time, summary. {query?, sinceHours?, limit?}. No match → 404 (not charged). Paid: $0.001 USDC via x402.
SEC filings by ticker (EDGAR) — Latest SEC EDGAR filings for a ticker or CIK — 10-K, 10-Q, 8-K (+ item codes), Form 4 — with dates and direct sec.gov links, plus CIK/exchange/industry. {ticker, forms?, limit?}. Paid: $0.0027 USDC via x402.
Prompt-injection check for untrusted text — Scan untrusted text (web page, email, tool description, agent message) for prompt-injection shapes — instruction override, role redefinition, credential-moving requests, hidden tags, invisible Unicode. {text} up to 8,000 chars. Verdict + findings; pattern-based. Paid: $0.0045 USDC via x402.
New & boosted token screener (DexScreener) — New and boosted tokens from DexScreener's public lists with price, liquidity, volume, buys/sells, change and pair age. {chain?, list?, minLiquidityUsd?, sort?, limit?} — default every chain, $10k minimum liquidity. Paid: $0.009 USDC via x402.
Latest satellite images of any point (Sentinel-2) — Latest Sentinel-2 satellite scenes for a point: date, cloud cover, JPEG preview, full true-colour GeoTIFF. {lat, lon, maxCloudPct?, days?, limit?}. Paid: $0.009 USDC via x402.
Technical SEO audit of a web page — Technical SEO audit of a page: indexability, title/description, canonical, headings, alt text, links, Open Graph, JSON-LD, mixed content, speed, robots.txt, sitemap — issues by severity + a 0-100 score. {url}. Paid: $0.009 USDC via x402.
x402 market leaderboard (who earns, from how many payers) — x402 market leaderboard from Coinbase's public index: sellers ranked by est. 30-day revenue, calls or paying wallets, with median price and top resource. {sort?, q?, network?, minPayers?, limit?}. Paid: $0.009 USDC via x402.
ENS & Basename resolver (both ways, with profile records) — ENS/Basename ↔ address, with url, X, GitHub, description and avatar records and a verified primary name. {name} or {address}. Paid: $0.0027 USDC via x402.
Time zone conversion (IANA tz database, DST-aware) — Convert a time between IANA zones, DST-aware. {time?, from?, to?}; send {} for now (UTC) in eight major zones. Paid: $0.001 USDC via x402.
Public holidays by country (and is this date one?) — Public holidays for a country and year, and whether a date is one. {country, year?, date?} - an empty body answers for DE. Paid: $0.001 USDC via x402.
Weather forecast for any point (MET Norway, 9 days) — Weather forecast for a point: current, hourly, daily min/max °C, precipitation, condition (MET Norway). {lat, lon, hours?, days?}. Paid: $0.0018 USDC via x402.
Wikipedia article summary (21 languages) — Wikipedia summary: title, description, lead text, link, last edit, image, coordinates. {query, lang?}. Paid: $0.0018 USDC via x402.
Hacker News search and front page — Hacker News front page or search: stories/comments/Ask HN/Show HN with link, points, comments, author, time, text. {query?, sort?, type?, sinceHours?, limit?}. No match → 404 (not charged). Paid: $0.0027 USDC via x402.
RSS / Atom feed reader — Any RSS/Atom feed as JSON: feed title/link + items (title, link, published, updated, plain-text summary, author, id). {url, limit?}. Not a feed → 422, unreachable → 502 (not charged). Paid: $0.0022 USDC via x402.
npm / PyPI package safety and maintenance — Safety + maintenance check of an npm or PyPI package version: OSV vulnerabilities, deprecation/yank, licence, repo, release age, downloads, risk flags. {name, ecosystem?, version?}; send {} for the published example. Paid: $0.0027 USDC via x402.
Company financials from SEC XBRL — Reported financials (revenue, net income, EPS, balance sheet, cash flow, shares) for a US ticker's last annual or quarterly periods, from SEC XBRL. {ticker, period?, limit?}; send {} for AAPL. Paid: $0.0045 USDC via x402.
Token verdict (EVM + Solana) — Token risk verdict in one call: 0-100 safety score, grade A-F, low/medium/high/critical risk with the reasons, price/liquidity/pair age (GoPlus + DexScreener). ERC-20 on 7 EVM chains or a Solana mint. {token, chain?}. Paid: $0.009 USDC via x402.
Strategy backtest (crypto, daily closes) — Backtest SMA crossover / RSI reversion / DCA / buy-and-hold on daily closes of any Coinbase USD market: return vs buy-and-hold, drawdown, Sharpe, win rate, trades, equity curve. {asset?, strategy?, days?, …} — {} = BTC SMA 20/50, 180 days. Paid: $0.009 USDC via x402.
Search the marketplace — Find paid + free MCP services other agents publish on FiatDock. Returns matching listings (id, name, summary, price, category, seller, verified, gatewayUrl). Read-only, free.
Get a service's detail — Full detail for one marketplace listing, including how to call it (paid → gateway with the 1% split; free/first-party → its real MCP endpoint). Read-only, free.
Call a marketplace service — Invoke a listed service. PAID listings route through the gateway (POST /s/{id}) and settle straight to each wallet (non-custodial): 100% to the seller (the gateway commission is currently waived); FREE/first-party listings are called at their real endpoint directly.
Search the public x402 index — Find any pay-per-call x402 endpoint on the internet — the public x402 index, hundreds of hosts, ranked by relevance then 30-day paid calls — not only FiatDock listings. Read-only, free.
Call any x402 endpoint — Call an index-listed x402 endpoint and pay it straight from your wallet to its own payTo — FiatDock takes no fee and never touches the money. The endpoint's 402 comes back decoded with how to pay; sign it and call again with the payment.