# The trust layer for autonomous agents

> One call before any irreversible action. AI agents pay per call (USDC via x402, no account, no API key) for live safety verdicts: XRPL token rug-checks, cross-chain address risk, pre-sign transaction intent, and endpoint & tool-poisoning trust — the full four-layer suite, live now.

This is an MCP server. Agents pay per call in USDC via the x402 protocol
(no account, no API key). Connect over streamable HTTP.

## The suite (one question: “is this safe to do?”)
- [LIVE] Token safety — XRP Ledger — “Is this token going to rug me?”
- [LIVE] Address & counterparty risk — “Is this address a scam, drainer, mixer, or sanctioned?”
- [LIVE] Transaction intent — “If my agent signs this, what actually happens?”
- [PLANNED] Endpoint & tool trust — “Is this x402 endpoint or MCP tool safe to pay and call?”

## Live tools
- check_xrpl_token(issuer, currency): Live safety verdict for any XRP Ledger token: clawback and global-freeze hard rejects, issuer blackhole status, LP-burn fraction, pool depth, and a proprietary rug blocklist. [$0.005 / call] — https://cerberusindex.com/tools/check-xrpl-token.html
- check_issuer_reputation(issuer): Reputation for any XRP Ledger issuer: proprietary rug blocklist status plus historical detection outcomes from a production sniper pipeline. [$0.002 / call] — https://cerberusindex.com/tools/check-issuer-reputation.html
- check_address(address, chain): One call, any chain: EVM address risk (sanctions, mixer, phishing, drainer, money-laundering) aggregated from GoPlus, plus native XRPL address screening — rug blocklist, clawback/freeze powers, and burn detection — that no incumbent offers. [$0.008 / call] — https://cerberusindex.com/tools/check-address.html
- get_wallet_activity(address, limit): Turn raw XRPL account_tx into readable activity: sent/received amounts with token names, trustlines, DEX/AMM ops — with rug-blocklisted counterparties flagged and account-takeover transactions surfaced. Watch your own wallet for compromise. [$0.008 / call] — https://cerberusindex.com/tools/get-wallet-activity.html
- check_transaction(transaction, account): Simulate an unsigned XRPL transaction against the live ledger: its exact balance changes, whether it would succeed, and a scan for drain vectors — key handover, master-key disable, clawback, partial-payment tricks — before the signature. [$0.01 / call] — https://cerberusindex.com/tools/check-transaction.html
- check_endpoint(url, tools): One call before an agent connects to a third-party MCP server or HTTP tool: TLS identity, domain age, and a tool-poisoning scan of the tool definitions — the hidden directives (instruction overrides, data exfiltration, invisible unicode) that hijack agents and that nobody else screens for. [$0.008 / call] — https://cerberusindex.com/tools/check-endpoint.html
- resolve_asset(issuer, currency): Resolve an XRPL token's real cross-chain identity: is it the canonical asset (legitimately deployed across chains) or an impostor riding a famous symbol like USDC or WBTC? Combines XRPLMeta, CoinGecko, and the Cerberus blocklist. [$0.008 / call] — https://cerberusindex.com/tools/resolve-asset.html
- verify_price(issuer, currency): Validate an XRPL token's price against its canonical cross-chain value: is a stablecoin still pegged, has the price diverged from other venues (manipulation/arbitrage), and is it backed by real liquidity? [$0.008 / call] — https://cerberusindex.com/tools/verify-price.html
- token_holders(issuer, currency): Holder distribution and concentration risk for any XRP Ledger token: holder count, top-1 and top-10 share of circulating supply, AMM pool separated from whales. [$0.008 / call] — https://cerberusindex.com/tools/token-holders.html
- verify_issuer_domain(issuer): Bidirectional XRPL issuer identity check: decodes the on-chain Domain field and verifies the domain's /.well-known/xrp-ledger.toml actually lists the issuer. [$0.003 / call] — https://cerberusindex.com/tools/verify-issuer-domain.html
- get_new_pools(limit): Feed of newly created XRPL AMM pools with initial liquidity, trading fee, and safety-signal scores from launch-time screening. [$0.01 / call] — https://cerberusindex.com/tools/get-new-pools.html
- explore_tokens(sort, query, limit, offset, trust_only): A DexScreener-style discovery feed for the XRP Ledger: rank 160,000+ tokens by volume, market cap, holders or trustlines, search by name — each row carries a trust level and rug-blocklist flag. [$0.004 / call] — https://cerberusindex.com/tools/explore-tokens.html
- get_token_ohlc(issuer, currency, interval, bars, fx): Open/high/low/close and volume candles for any XRP Ledger token, at 5m to weekly intervals, quoted in XRP or USD — the price-history series behind a candlestick chart. [$0.004 / call] — https://cerberusindex.com/tools/get-token-ohlc.html
- analyze_token_trend(issuer, currency, interval, bars): Technical analysis for any XRP Ledger token: trend, RSI momentum, support/resistance, volatility and volume trend computed from OHLC — with an optional AI-written outlook and counter-argument. A signal, never financial advice. [$0.02 / call] — https://cerberusindex.com/tools/analyze-token-trend.html
- quote_amm(issuer, currency, xrp_in): Quote an XRP-to-token swap against a live XLS-30 AMM pool: tokens out, spot vs effective price, price impact, pool depth, and trading fee. [$0.001 / call] — https://cerberusindex.com/tools/quote-amm.html
- find_best_path(to_currency, to_issuer, to_amount, from_currency, from_issuer, account): Find the safest executable route for an XRPL swap: real payment paths (order books + AMM + multi-hop) with every issuer and gateway on the route screened for clawback, freeze, and rug signals. [$0.006 / call] — https://cerberusindex.com/tools/find-best-path.html
- watch_token(issuer, currency, subscriber_key, duration_days, drain_threshold_pct, rebaseline): Continuous monitoring for any XRP Ledger token: get alerted when the AMM pool is destroyed, liquidity drains, clawback is enabled, the issuer freezes trading, or an issuer stops being blackholed. [from $0.005 / window] — https://cerberusindex.com/tools/watch-token.html
- check_alerts(subscriber_key, limit): Free companion to watch_token: collect queued XRPL token alerts — what changed, how severe, and the on-chain numbers behind it — plus the status of every watch you own. [FREE] — https://cerberusindex.com/tools/check-alerts.html
- submit_feedback(message, tool, requested_capability): Free feedback channel for AI agents: request capabilities, report issues. High-volume requests get built first. [FREE] — https://cerberusindex.com/tools/submit-feedback.html

## Endpoints
- MCP (streamable-http): https://cerberusindex.com/mcp
- Full machine docs (one fetch): https://cerberusindex.com/llms-full.txt
- Markdown docs per tool: https://cerberusindex.com/tools/<slug>.md
- Agent card: https://cerberusindex.com/.well-known/agent.json
- Connect guide: https://cerberusindex.com/connect.html
- Live stats (JSON): https://cerberusindex.com/api/stats
- Accuracy scorecard (verdicts scored vs reality): https://cerberusindex.com/accuracy.html · JSON: https://cerberusindex.com/api/accuracy
- Rug Registry (confirmed rugs + dead-on-chain tokens): https://cerberusindex.com/registry.html · JSON: https://cerberusindex.com/api/registry

## Notes for agents
- Agents: use the free submit_feedback tool. High-volume requests get built first.
- Verdicts are informational risk signals with reasons, not financial advice:
  https://cerberusindex.com/disclaimer.html
- Terms: https://cerberusindex.com/terms.html · Privacy: https://cerberusindex.com/privacy.html