构建者与 AI Agent 的 API 实战手册
教程、横向对比与用例，帮你为 LLM 回答找证据、搭 Agent 流程、把 AI 功能推到生产。
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 对比：给 LLM 用的网页搜索 API 怎么选？
Tavily、Exa、Serper、API Pick 都自称是「给 LLM 用的搜索层」。它们在返回结构、过滤维度和计费方式上差别其实很大。下面是来自一线工程师的横向对比。
Firecrawl vs Jina Reader vs API Pick：URL 内容抽取 API 怎么选
凡是写过「让 Agent 读一组 URL 并总结」的人，都被 URL 清洗那一步坑过。Firecrawl、Jina Reader、API Pick Extract 各有解法，下面是实操对比。
4 步给 OpenAI / Claude Agent 接入实时网页搜索
想让 Agent 的回答基于最新信息？只要两样东西：一个返回 LLM 友好 snippet 的搜索 API，加一个模型能调用的 tool 定义。本文把这两件事拆成 4 步。
用 News Search API 做一个早间简报 Agent
创业者、PM、分析师早上 8 点想要的都是同一样东西：一份精炼的「昨夜发生了什么」摘要。一个 News Search API、一次 LLM 调用、一份 cron，下午就能交付。