Every agent-payable API.

Evaluate caller-supplied x402 payment requirements before a wallet signs them. Use after receiving HTTP 402 to enforce a maximum USDC amount, allowed networks, exact scheme, recipient presence, and an optional expiry buffer. Returns eligible accepts and explicit blockers for 0.002 USDC via x402 on Base; it never signs, pays, stores, or echoes a payment signature.

Evaluate data age against a caller-supplied freshness objective. Use it as a bounded preflight or analysis step inside an enterprise agent workflow before data, policy, integration, security, or commercial decisions reach production. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, memory-only, and has no paid upstream or input retention. Results are advisory; the caller remains responsible for authorization and produ…

Evaluate simple refund eligibility flags against policy JSON. Call when agents checking refund windows before opening disputes. Returns eligible and reasons 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.

Disclosure timeline for one Korean listed company (6-digit ticker or DART corp code).

Single Korean disclosure detail by DART receipt number, with classification and source link.

Korean corporate disclosure (DART) event stream, cursor-based delta. All filings, classified with importance score.

Start async retrieval of life events and career milestones. Requires event parameter.

FDA drug-approval catalyst change stream for US-listed biotechs: every state change of every catalyst we track — each PDUFA date as it is set, extended and resolved — with the real outcome (approval, or CRL/rejection), the SEC filing quote and its EDGAR source. A superset of the upcoming calendar, as a since-cursor delta feed. Date accuracy AND our coverage of the FDA universe are both published free and unflattered at GET /v1/accuracy — audit before you pay.

Every field typed. Empty = explained. You never pay for a blank. Multifamily real estate deals feed: property listings with auditable NOI/DSCR underwriting and Hot/Warm/Pass scoring — every absent value carries a typed reason, and a filtered query that matches nothing returns a free, typed empty result instead of charging you.

Everything a Base address holds, valued in USD: ETH plus its ERC-20 tokens, largest first, with a spam floor you set

Evidence Pack for one event: source-passage excerpts with locators, the retrieval timestamp, sha256 snapshot hash, and a freshness/provenance verification status.

Live Bitcoin BTC-USD market-regime and risk evidence for autonomous AI agents, algorithmic systems, portfolio monitors, and quantitative workflows. Returns current market state and phase, coherence, commitment, pressure, derived directional bias, alert label, completion readiness, transition strength, false-breakout risk, and recent state-change events. Experimental analytics only; not financial advice.

Retrieve full page contents, summaries, highlights and metadata for known URLs.

Search the web with Exa semantic or keyword retrieval and optional contents.

Convert an amount between two currency codes using current reference exchange-rate data.

Current foreign-exchange rates from the European Central Bank for any base currency.

Creative technically-flavored excuse for being late or unresponsive.

What it would cost to execute a given notional in a given market right now: size-weighted fill price, slippage from the touch in basis points, and whether the visible book can absorb the size at all.

EXECUTION DISCOVERY: which stablecoin vaults support direct deposit/redeem through barker_execution_quote. Returns executable pools with adapter support, live deposit capacity (is_full) and APY/TVL. Call this before barker_execution_quote — every pool listed here can be quoted. APY unit: decimal (0.05 = 5%). Use for 'which pools can my agent actually deposit into', '哪些池子能直接存'.

EXECUTION QUOTE (non-custodial): buy an unsigned, ready-to-sign transaction that deposits into or redeems from a stablecoin vault. Returns transaction_request {chainId,from,to,data,value} + route + risk summary + approval info. Barker NEVER broadcasts and never holds funds — return the transaction to YOUR user's wallet to sign; vault shares always go to signer_address…

Exit capacity for USDC lending on Base: per-protocol utilization and withdrawable liquidity read from the protocol's own books (Aave, Compound), plus whether your size (?amountUsd=) can be withdrawn right now and what share of the market it would be. Protocols that do not expose borrowed-vs-supplied are marked unmeasured, never assumed liquid. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.

Exit capacity for WETH lending on Base — same contract as the USDC capacity route. Utilization is reported for every measured protocol; USD figures are omitted for WETH (no price oracle in the paid path), so size verdicts need the USDC route. Unmeasured protocols are named, never assumed liquid. Verified per-asset accuracy is free at /accuracy.json; raw on-chain attestations at /track-record.

Expectancy per trade from win rate, avg win, and avg loss. Call when deciding if a system has positive edge before scaling size. Returns expectancy per trade 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.

DripMetricsAI (https://dripmetrics.ai/) provides on-demand BTC option-derived metrics that combine the Deribit option chain with DripMetrics' own trade-level realized calculations. Agents can pay per request via x402 and receive structured JSON metrics without subscriptions or API keys. Expected-move consumption measures the share of the nearest-expiry ATM straddle's implied move already consumed by the realized move on DripMetrics' BTC trade tape over the requested window.

Expected calibration error from forecast/outcome pairs. Call when scoring probability model calibration offline. Returns ece and n 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.

Expected impact price from mid and signed slippage fraction. Call when simulating worse fills before sending size. Returns impacted price from mid 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.

Expected value of buying binary NO at (1−yes_price) under true_prob. Call when checking the NO side when YES is mispriced the other way. Returns EV per $1 notional on NO 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.

Expected value of buying binary YES at market_price under true_prob. Call when deciding whether a YES buy has positive EV before size. Returns EV per $1 notional on YES 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.

Expires Header Validate: Expires Header Validate compares Date and Expires timestamps for an explicit cache lifetime from bounded caller-supplied values without an external provider. Call Expires Header Validate before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for Expires Header Validate as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-part…

Generate an explainer video (about 5 minutes) from a topic with AI scenes and narration. Pay once via x402, then poll statusUrl for the MP4 download.

Extend an agent board from /agent/board by 30 days. Give the board_handle you were issued. Renew early and the days are added on top; renew late and the month starts today. An expired board is frozen, never deleted: your human keeps seeing it, every card and note survives, and agents simply cannot write to it until you renew.

How much time and interest an extra monthly payment saves on a loan.

Crawl a website, use the provided JSON Schema and instructions to prioritize relevant internal links, and extract structured data from the selected pages.

LLM-driven extraction from a URL, HTML, or markdown input with a prompt and optional JSON schema.

Extract a public web page into clean structured JSON for agent workflows: title, description, main text, all JSON-LD, Open Graph and Twitter metadata, headings, links, and AI-crawler and structured-data signals. Follows redirects and enforces timeout, response-size, and SSRF safeguards.

Scrape a URL and extract structured data using a schema: company_profile, team_members, pricing, tech_stack, social_links, branding, full_intelligence. 2 credits.

LLM-driven extraction from a URL, HTML, or markdown input with a prompt and optional JSON schema.

Turn any public URL into clean, agent-ready markdown (Readability). Title, byline, excerpt, markdown up to 60k chars. Param: url.

Convert a Twitter/X, LinkedIn, Medium, Substack, Beehiiv, or public Notion page URL into clean markdown.

Structured data extraction returning typed JSON from 17 specialized site extractors: Twitter/X, GitHub, CoinGecko, Hacker News, YouTube, Wikipedia, npm, PyPI, crates.io, Product Hunt, IMDb, Amazon, Crunchbase, SEC EDGAR, Zillow, Redfin, and news articles. Auto-detects the right extractor from the URL — no scraping selectors required.

Send a URL and receive the main content of the page as clean markdown, stripped of navigation, advertising and boilerplate. The page is fetched through a French residential IP with a real Chromium browser, so JavaScript-rendered content is fully resolved and sites that reject datacenter traffic are still reachable.

Extract structured public business contact information from any public business website. Returns company name, emails, phone numbers, social profiles, postal addresses, and contact pages as structured JSON. $0.05 per request via x402 on Base.

Extract English machine-printed text from one caller-supplied PNG, JPEG, or WebP locally for $0.01 USDC via x402. Returns bounded text, confidence, and SHA-256 receipt; no URL fetch, storage, or paid vision provider.

Pull deduped lists of emails, URLs, IPv4 addresses, @mentions and #hashtags out of free text, with counts.

Extract HTTP/HTTPS URLs from text for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the supplied input or one bounded public endpoint at request time; callers must verify before acting.

Extracts all hyperlinks from the web page at the given URL and returns them as absolute URLs. If `secure_mode` is enabled, the URL is checked against a malicious-URL database before the page is fetched.

Extract page metadata: title, description, keywords, author, published/modified dates, canonical, language, favicon, and OpenGraph/Twitter card tags.

Extract structured elements: heading hierarchy (h1-h6), lists, tables as 2D arrays, and images with alt text, plus element counts.

Extract structured metadata from a page: title, description, OpenGraph, JSON-LD, headings, links

Extract structured receipt fields — merchant, date/time, line items, subtotal, tax, tip, total, currency — from a receipt image/PDF. ≤2 pages.