ビルダーと AI エージェントのための API プレイブック
LLM の回答を裏付け、エージェントのワークフローを組み立て、AI 機能を本番に投入するためのチュートリアル・比較・ユースケース。
Google Patents API Is Dead — 6 Alternatives for Prior-Art and Freedom-to-Operate Search
Google Patents Public Datasets retired without a documented replacement, and the USPTO migrated PEDS into a new Open Data Portal mid-2026, breaking pipelines on the way. Here's what actually works in 2026 for prior-art, FTO, and IP-research workloads — six alternatives, side by side.
How to Build a Scientific Literature-Review Agent Without Getting Rate-Limited
Build a literature-review agent on raw arXiv + PubMed + Semantic Scholar today and you'll hit 429s before you finish ten papers. Here's why the rate limits got worse, what PaperQA / Undermind actually do under the hood, and a working pattern that survives a real review session.
Polymarket vs Kalshi API: A Developer's Side-by-Side Guide (Auth, CLOB, WebSocket, Historical Data)
Polymarket and Kalshi run the same primitive — yes/no contracts on a CLOB — through completely different APIs. One demands EIP-712 signatures and a Polygon wallet; the other is a REST endpoint with optional FIX. If you're building a forecasting agent, an arbitrage bot, or a smart-money monitor, here's the side-by-side guide that should already exist.
Citation-Grounded UK Case Law Retrieval After Ayinde v Haringey
Ayinde v Haringey changed the calculus for UK legal AI overnight. A barrister cited five fake cases generated by an LLM and got referred to the Bar Standards Board. Hallucinated citations now have professional-conduct consequences. Here's the developer's guide to building citation-grounded UK case law retrieval — TNA Find Case Law, legislation.gov.uk, neutral-citation parsing, and how to wire it into a working agent.
Wiring ClinicalTrials.gov v2 + openFDA + ChEMBL into a License-Clean Drug Intelligence Endpoint
Pharma R&D, medical-AI startups, and pharmacovigilance teams all want the same thing: one endpoint that pulls trials, labels, adverse events, and bioactivity in a license-clean way. Here's the working architecture, with the trap doors that have surprised teams in production.
Build a Research Agent with Search + URL Extract (Claude tool use, end-to-end)
Most 'AI research agent' tutorials stop at 'here's a tool definition.' This one ships a working agent: question in, cited answer out. Search, extract, reason, cite — all under 120 lines of Python.
Building a Due-Diligence Agent on SEC Filings (10-K, 10-Q, 8-K, Earnings)
Reading a 10-K is mostly Ctrl+F. Doing it for fifty companies is a job. Replace the boring 80% with a search-and-extract agent against SEC EDGAR — keep the 20% that matters for the human analyst.
Why APIs Should Charge Only on Success — The Case for HTTP-200 Billing
Most APIs charge on every billable call. AI agents retry on flaky upstream services constantly — which means the legacy 'always charge' model effectively taxes resilience. Here's the case for billing only on HTTP 200, and what it changes about how you design agents.
Tavily / Exa / Serper / API Pick 比較：LLM 用の Web 検索 API はどれを選ぶ？
Tavily / Exa / Serper / API Pick はどれも「LLM 用の検索レイヤー」を名乗るが、出力形式・フィルター・課金方式は意外と違う。現場視点での横並び比較。
Firecrawl / Jina Reader / API Pick：URL 抽出 API の選び方
「エージェントに URL リストを読ませて要約させる」を作ったことがあれば、URL クリーンアップ税は必ず踏んでいる。Firecrawl / Jina Reader / API Pick Extract の解法はそれぞれ違う。実用比較。
OpenAI / Claude エージェントにリアルタイム Web 検索を 4 ステップで追加する
エージェントの回答を最新情報で裏付けたい？必要なのは 2 つ：LLM 向けスニペットを返す検索 API と、モデルが呼べるツール定義。本記事はこれを 4 ステップで実装する。
News Search API でモーニングブリーフィングエージェントを作る
創業者・PM・アナリストが朝 8 時に欲しいのは同じもの：昨夜何が変わったかの精製サマリ。News Search API + LLM + cron があれば、午後一番で出荷できる。