Every agent-payable API.

How much of the USDC lending APY on Base survives if incentives stop: per-protocol base-vs-reward split, the post-incentive floor, and whether the leader changes without incentives. Derived only from reported/inferred reward components already read — sources that do not itemize are listed as undecomposable, never assumed incentive-free. A stress test of current readings, not a date forecast. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.

How close USDC lending on Base is to the kink where borrow rates explode: per-protocol utilization, the kink read from the protocol's own rate curve, headroom in bps, and borrow APY at points around it. Aave and Compound only — Morpho's adaptive IRM has no static curve and DefiLlama-sourced protocols expose none, so they are marked unmeasured, never assumed stable. Describes state, not a forecast. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.

How long a USDC leadership call actually holds, from hourly on-chain attestations (EAS): median lead duration, survival at 6/24/72h, how much of the rotation is the same two protocols trading places, and what chasing the leader is worth per $10k before gas. Also reports whether a wider lead lasts longer — measured, and it does not. Observed history with sample sizes, never a forecast. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.

UUID generator API for agents: generate one to ten UUIDv4 identifiers for $0.001 USDC with no API key or subscription.

Create an about 8-second UGC-style product ad from a product image and details. Pay once via x402, then poll statusUrl for the MP4 download.

UK beneficial owners — Persons with Significant Control (Companies House), key for KYB/AML. Query: ?q= or ?number=

UK company directors/officers (Companies House): name, role, appointment/resignation, nationality. Query: ?q= or ?number=

UK company KYB verdict in one call: status, accounts/filing compliance, insolvency history, officers, beneficial owners. Query: ?q= or ?number=

UK company profile (Companies House): status, incorporation, SIC codes, registered office, accounts due dates, insolvency/charges flags. Query: ?q= or ?number=

UK mortgage payment calculator: monthly payment, total interest, LTV, repayment or interest-only.

Japan's unemployment rate from the Statistics Bureau's Labour Force Survey, not seasonally adjusted, monthly since 2000, broken out by total/male/female. Same e-Stat API family as estat.search/estat.table_data. Factual published data only; not investment advice or a forecast.

Unique and sort a JSON list. Call when you need stable unique keys for agent set math. Returns sorted unique items and count for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Unique words with counts. Use for lightweight keyword inventory from notes, pages, or chat transcripts. Returns unique tokens and frequencies without external NLP services. $0.001 USDC per successful call via x402 on Base—deterministic first-party JSON, no API key, no subscription, and nothing is billed on structured validation errors.

Unit conversion API: convert between 100+ units across length, mass, volume, temperature, area, speed, pressure, energy, power, and digital storage. Exact factors, instant, local. Deterministic and auditable — cheaper than burning reasoning tokens, zero arithmetic-hallucination risk, and the result can be cited. Unknown units return a helpful 400 listing valid targets.

Unit conversion — Convert between units (length, mass, volume, speed, area, data, time, pressure, energy, temperature, angle).

Unit conversion API for agents: length, mass, volume, time, data and temperature (up to 100 conversions per call) for $0.002 USDC.

Unlock Cipher Shades for a target creature. Gifts are allowed; rank is unchanged.

Unlock Fibre Crest for a target creature. Gifts are allowed; rank is unchanged.

Unlock Glitch Shutter for a target creature. Gifts are allowed; rank is unchanged.

Unlock Mempool Rain for a target creature. Gifts are allowed; rank is unchanged.

Unlock Operator Cap for a target creature. Gifts are allowed; rank is unchanged.

Unlock Packet Specs for a target creature. Gifts are allowed; rank is unchanged.

Unlock Settlement Tunnel for a target creature. Gifts are allowed; rank is unchanged.

Unmet-demand finder: compares observed USDC spend against how many sellers actually serve each category, with recent momentum where a real prior window exists. The payer-quality component is applied only when wallet scan coverage supports it. Use this to decide what to build — categories with high spend and few suppliers are the gaps.

Unpaid-claim follow-up triage. Given an action code (RES/CPE/CRO/APP/PAY or blank), balance, and claim ages, returns the work bucket (WORK_NOW / WAITING / REVIEW / COMPLETE), risk flags (FELL_THROUGH, OVERDUE, TIMELY_RISK), a priority score, and the recommended next action with its deadline. (AutomatedRCM agent: WorkQueue)

Unrealized PnL versus mark from entry and size. Call when open position dashboards and liquidation preflight. Returns unrealized pnl at mark as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Upcoming US economic data releases — WHEN the market-moving prints land, not just their latest values. Returns curated high-importance releases (CPI, PPI, PCE, jobs, JOLTS, GDP, retail sales, housing starts, industrial production) within `?days=` (default 30, max 90), each with date and category, plus the next FOMC meeting. `?past=true` includes the last week. Release dates from FRED.

Upper-bound CPMM price impact loss for size vs reserves. Call when pre-trade MEV/slippage stress without mempool access. Returns impact_fraction and loss_notional as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

US electricity grid demand (MWh/hour) from EIA. POST body: {ba, length, start?}.

US equity market session clock: is the underlying cash market (NYSE/Nasdaq) open, pre-market, after-hours, or closed right now, with holiday/half-day awareness and minutes-to-open/close. Send {}. The scheduling primitive every 24/7 Robinhood Chain agent needs to time premium/discount and gap trades around market hours.

US federal disaster declarations from OpenFEMA: declaration and incident type, state, county, incident dates and authorised assistance programs. OData filter supported. Keyless.

US public company profile (SEC EDGAR): name, CIK, tickers, exchange, SIC, state, fiscal year, latest filing. Query: ?ticker= or ?cik=

US sales tax — add or remove tax using the verified 2026 STATE base rate for any state + DC, plus an optional local rate. Flags gross-receipts states (HI/NM) and local-only states (AK).

US SEC filings data: resolve a ticker to its CIK, then pull a reported XBRL financial concept (Revenues, Assets, NetIncomeLoss…) as a time series

美股技术指标 — 纯Python计算技术指标: MA5/10/20/60、EMA12/26、MACD、RSI14、KDJ、布林带(20,2), 基于Yahoo历史K线本地算, 零依赖。任何技术分析Agent刚需。

US Treasury par yield curve API - every constant-maturity rate from 1 month to 30 years for any published business day, plus the spreads nobody wants to compute themselves. 2s10s, 3m10y and 5s30s are returned with an explicit inversion flag, because the real question is whether the curve is inverted, not what fourteen numbers are. A tenor Treasury did not publish that day is null, never zero. For macro, rates, credit and risk agents.

US 30-Year Treasury Bond yield (%), delayed, via Yahoo Finance

USDG (Global Dollar) on Robinhood Chain: total supply, holder count, contract. The chain's native stablecoin at a glance. Send {}.

Current USD/KRW exchange rate (ECB reference via Frankfurter, fallback open.er-api.com).

Use when an agent needs agent preflight bundle. Returns Accountless agent preflight bundle combining proven server time, current Base block number, gas price, Base USDC wallet balance, optional x402 endpoint challenge checks, component statuses and a sha256 evidence hash. $0.005.

Use when an agent needs agent return context. Returns Accountless returning-agent context bundle with optional Bazaar, time, Base, and x402 facilitator-health components, repeat-call count, visit gap, statuses, and evidence hash. $0.005.

Use when an agent needs mpp admission gate. Returns Admit one service from the live MPP public catalog for a task, price cap, Tempo rail and freshness constraint, or return a deterministic refusal with catalog evidence. $0.005.

Use when an agent needs rep linkedpanda search. Returns Linked Panda-shaped LinkedIn profile search for agents, with bounded public Wikimedia results, pagination, and explicit nulls for unavailable LinkedIn fields; not a Linked Panda proxy. $0.30.

Use when an agent needs rep stableenrich people enrich. Returns Accountless people enrichment lookup that normalizes supplied name, email, phone, company, LinkedIn URL and location signals into structured identity and requested fields; unavailable third-party fields are explicit nulls. $0.28.

Use when an agent needs rep stableenrich search. Returns FullEnrich-shaped people search for agents, with bounded public Wikimedia results and explicit nulls for private contact and employment fields; not a stableenrich.dev proxy. $0.10.

Use when an agent needs us equity snapshot. Returns Fresh US equity OHLCV snapshot for one ticker and interval with bounded lookback, optional SMA/EMA/RSI indicators, source attribution and freshness evidence; stale or unavailable data is refused without settlement. $0.01.

One-call market snapshot for one crypto perpetual across every tracked venue — funding rate, annualized carry with contango/backwardation structure, open interest, 24h volume and mark price in a single response. Bundles funding/carry/open-interest/volume-24h so an agent makes one paid call instead of four.

Per-venue basis for one crypto perpetual — mark versus index price, basis_bps = (mark−index)/index×10000, and contango/backwardation structure, across tracked CEX and DEX perp venues. Every tracked venue publishes an index except Crypto.com and Variational; `venues_without_index` names the ones missing from your specific response. Each venue also carries liquidity_state (live/dead/unknown), and a market with no trading is flagged unreliable however clean its basis looks.

Per-venue funding carry for one crypto perpetual: raw funding_rate, annualized_carry_pct, and contango/backwardation structure from the funding sign. What holding this perp pays or costs you per year, venue by venue, across tracked CEX and DEX venues.

User-agent string parsing: browser, engine, OS, device type/vendor/model, CPU architecture, plus a likely-bot flag. For agents analyzing logs or adapting responses per client.