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US M2 money stock, monthly, in billions of dollars (seasonally adjusted), with the latest value, prior month, month-over-month and year-over-year change, and recent history. No ticker needed. A liquidity gauge watched for inflation and risk-asset context. Sourced from the St. Louis Fed (FRED). From x402stock, a pay-per-call market & economic data API. Pay per request in USDC via x402, no API key.

Deterministic citation formatter — APA 7, MLA 9, Chicago 17 author-date, BibTeX. From structured fields, returns the reference entry (markdown/html/plain) + the in-text citation, reproducing published style-manual examples exactly. For full author lists use POST. Every answer signed. Free sample, no payment required: GET /play/cite

24h aggregate ON-CHAIN Polymarket flow by market, as ONE ed25519-SIGNED attestation (kind "onchain-flows"): per-market YES/NO volume split, net flow, trade counts and unique wallets over tx_hash-anchored Polygon trades only (platform='polymarket' AND tx_hash present — Kalshi's anonymous prints are excluded by construction). Honest scope: Polymarket-whale on-chain activity, NOT general crypto flows. The signed window_start/window_end are the exact bounds the aggregation ran over (window_end honours the 15-min delay); USD volumes are MODELED notionals, labeled in data_basis. Top-20 markets by volume; market titles ride outside the envelope (mutable metadata, never signed). Verify FREE offline at GET /verify.

DripMetricsAI (https://dripmetrics.ai/) provides on-demand order-book microstructure metrics computed fresh per request from Binance's public depth snapshot. Agents can pay per request via x402 and receive structured JSON metrics without subscriptions or API keys. Concentration is a Herfindahl index of how concentrated volume is within the top depthLevels on each side; higher means a thinner, more fragile book.

Fuzzy search pools by keyword (protocol name / pool name / asset). Resolves natural-language pool references to pool_uid for the detail/history tools.

VAULT POSITION (on-chain read): current redeemable value of a wallet's ERC-4626 vault position. Pass the pool_uid (from barker_executable_pools / barker_execution_quote) and the wallet address; Barker resolves the vault contract and reads balanceOf + convertToAssets directly on-chain, returning shares and current_value in the vault's underlying asset (value_asset, e.g. USDC).…

Historical APY trend for stablecoins vs. US Treasury benchmark over a lookback window (7–180 days). Use for 'DeFi vs treasury', 'is stablecoin APY going up', 'crypto yield trend', '稳定币利率走势'.

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What stocks and crypto Reddit is talking about most over the last 24h, by mention volume across the busiest Reddit money subreddits (r/wallstreetbets, r/stocks, r/CryptoCurrency, r/Bitcoin, etc.). Each ticker carries mentions, upvotes, and 24h change in rank and mentions; covered subreddits are listed per response. ?filter=stocks|crypto|all (default all), ?page=. From x402stock

Early opportunity signals aggregated for BSC chain.

Track capital flows from high-volume DEX participants.

Permit2 + EIP-2612 Gas Sponsoring Demo — forces the gasless Permit2 path so a fresh wallet holding USDC but ZERO ETH can complete the flow. The CDP facilitator submits the EIP-2612 permit and the Permit2 transfer atomically in a single transaction via x402ExactPermit2Proxy.settleWithPermit. The response carries the on-chain tx hash + Basescan link so callers can confirm the permit + transfer landed together. Pay $0.001 USDC on Base mainnet.

three.ws Skill Marketplace — list active skill listings with pricing across all three.ws agents. Optionally filter by skill name to find the cheapest provider for a specific capability (e.g. inspect_model, render_avatar). Returns price atomics, chain, currency, trial offer, and time-pass terms when set by the agent owner. Use to route paid work to the cheapest agent.

three.ws Symbol Availability — given a candidate ticker symbol, check for exact and fuzzy collisions across pump.fun mints indexed by three.ws. Returns exact matches (same symbol on the same network) plus trigram-similar symbols (e.g. "USDC" vs "USDCC", "PUMP" vs "PMP"). Use before launching a token to avoid name confusion and aggregator-search dilution.

Use to find the day's biggest movers in one call. Returns the top 10 gainers and top 10 losers by percent move with price, the current US market session status (open, closed, pre, or post), and the latest market news headlines. No ticker needed. Built for agents scanning what is moving today. From x402stock, a pay-per-call market & economic data API. Pay per request in USDC via x402, no API key.

SYNTHORA tvl-concentration: DeFi TVL drain/concentration signal — protocols anomalously losing TVL while token price has not yet repriced (temporal edge window). For liquidation and risk bots. Source: DeFiLlama. $0.03 USDC x402 Base.

Find people by name and optionally company name. Returns matching profiles.