# Horizon > Aggregate AI industry intelligence: curated news from Hacker News, Reddit and more, > LLM-scored for relevance, with daily AI-generated briefings and a US/UK/EU AI > regulation tracker. Free machine-readable tier below; cite as "Horizon" (https://horizon.alchemylab.sh). ## Free endpoints (no auth) - [Today's briefing (markdown)](https://horizon.alchemylab.sh/briefing.md): top stories, emerging signals, new entrants, China & East-Asia AI highlights, and regulation updates. Cheapest single fetch for "what happened in AI today". - [Briefing (JSON)](https://horizon.alchemylab.sh/api/public/briefing): same content, structured. Add ?format=md for markdown. - [Briefing by date](https://horizon.alchemylab.sh/api/public/briefing/YYYY-MM-DD): last 7 days. - [Briefing archive (HTML)](https://horizon.alchemylab.sh/briefing): human-readable daily briefings, last 7 days, each at /briefing/YYYY-MM-DD. - [AI regulation headlines (JSON)](https://horizon.alchemylab.sh/api/public/regulations): current AI legislation and rulemaking with stages, spanning US Congress, US federal agencies, US states, UK, and EU. Filter with ?jurisdiction=us_federal|us_state|uk|eu. Add ?format=md for markdown. - [Delta feed (JSON)](https://horizon.alchemylab.sh/api/public/feed): `?since=&limit=®ion=china` — poll for newly-added items without re-fetching. Returns `{items, nextCursor, hasMore}`; pass nextCursor back as `since` each poll. Add `region=china` for only China/East-Asia AI items. Metadata only (titles, links, topics, scores) — full bodies and higher limits are on /api/v1/feed. - [Related items (JSON)](https://horizon.alchemylab.sh/api/public/related): `?id=&limit=` — the most semantically similar items to a given one (ids come from the feed/search). Metadata only; full bodies on /api/v1/related. - [RSS](https://horizon.alchemylab.sh/feed.xml): daily briefings feed. - Topic hubs at https://horizon.alchemylab.sh/topics/ (models, tools, use-cases, regulation, research, funding, opinion, tutorial) and entity hubs at https://horizon.alchemylab.sh/entities/ — recent relevance-scored coverage per topic/company/model/person. - Regional AI hubs: [China & East-Asia](https://horizon.alchemylab.sh/china) (Qwen, DeepSeek, Zhipu, Moonshot, ModelScope), [Europe/EU](https://horizon.alchemylab.sh/eu) (Mistral, Aleph Alpha, Black Forest Labs, the EU AI Act), and [South America](https://horizon.alchemylab.sh/south-america) (Maritaca, Widelabs — emerging) — relevance-scored coverage per region; also a `region=china|eu|south-america` filter on the feed/search and the get_region_signal MCP tool. ## MCP server Streamable HTTP endpoint at https://horizon.alchemylab.sh/api/mcp with tools: get_daily_briefing, get_regulation_updates, get_china_signal (China/East-Asia lens), get_region_signal (any region, e.g. eu), get_topic_signal (any topic, e.g. models/regulation/research), search_news (top-3 teaser), get_new_since (incremental poll — pass the returned cursor back each call), get_related (semantic more-like-this by item id), list_sources (coverage + how to filter). No auth. One more tool, ask_horizon (a synthesized cited answer to a question), requires a Horizon API key sent as `Authorization: Bearer hzn_live_...` on the request. ## Paid agent API (API key) Subscribers can mint API keys at https://horizon.alchemylab.sh/api-keys for the /api/v1 tier — full-depth access, authenticated with `Authorization: Bearer hzn_live_...` (120 req/min; monthly quota by plan — Standard 10k, Pro 100k — a 429 with `resetsAt` when exceeded): - **Machine-readable spec**: [OpenAPI 3.1](https://horizon.alchemylab.sh/openapi.json) — also at `/.well-known/openapi.json`, with an ai-plugin manifest at `/.well-known/ai-plugin.json`. Import it into GPT Actions, LangChain, or any OpenAPI tool-caller to auto-generate a typed client for the endpoints below. - [Ask Horizon](https://horizon.alchemylab.sh/api/v1/ask): POST JSON `{"question": "what did OpenAI ship this week?", "days": 14, "limit": 18}` — returns a synthesized, cited answer grounded only in Horizon's recent corpus: `{answer, citations:[{n,title,url,source,publishedAt}], retrieved}`. Answer text cites sources inline as [n]. One call instead of search-then-read. - [Full search](https://horizon.alchemylab.sh/api/v1/search): `?q=&source=&topic=®ion=china&from=&to=&limit=&offset=&collapse=` — searches all content (not the 3-item free teaser). Near-duplicate stories are collapsed to one representative per cluster by default (each carries `clusterSize`); pass `collapse=false` for every matching row. - [Delta feed](https://horizon.alchemylab.sh/api/v1/feed): `?since=&limit=®ion=china` — same incremental poll as the free feed but with full bodies and up to 200 items/page. - [Related items](https://horizon.alchemylab.sh/api/v1/related): `?id=&limit=` — full-body "more like this" over the semantic embeddings. - [Full briefing archive](https://horizon.alchemylab.sh/api/v1/briefings): `?from=&to=&limit=` — complete history, no 7-day cap. - [Webhooks](https://horizon.alchemylab.sh/api/v1/webhooks): register your own push endpoints. POST JSON `{"url":"https://...","topics":[],"entities":[],"keywords":[]}` (signing secret returned once); GET lists them; DELETE /api/v1/webhooks/ removes; POST /api/v1/webhooks//test fires a signed test event. Same as the dashboard, key-gated. - [Usage](https://horizon.alchemylab.sh/api/v1/usage): your key's current rate-limit + monthly-quota state `{rateLimit:{limit,remaining,resetSeconds}, quota:{limit,used,remaining,resetsAt}}`. Every /api/v1 response also carries `X-RateLimit-*` and `X-Quota-*` headers, so you can self-throttle without a separate call. ## Webhooks (push) Subscribers configure webhooks at https://horizon.alchemylab.sh/webhooks to have newly-matched items (by topic/entity/keyword, or all) POSTed to their endpoint in near-real time. Each delivery is signed: `X-Horizon-Signature: t=,v1=` where the HMAC-SHA256 key is your signing secret and the message is `.`. Verify it and reject stale timestamps. Agents can self-register and manage webhooks programmatically via the key-gated /api/v1/webhooks endpoints above. ## Paid tier ($5/mo) Live scored feed, full-text search, complete regulation timelines and history: https://horizon.alchemylab.sh/subscribe. Free daily email digest: https://horizon.alchemylab.sh/newsletter ## Policies - [Privacy](https://horizon.alchemylab.sh/privacy) - [Terms](https://horizon.alchemylab.sh/terms)