TrustFoundry launches public API for legal search and reasoning

By AI, Created 9:58 AM UTC, May 20, 2026, /AGP/ – TrustFoundry has opened a public API that lets developers, AI agents and legal platforms embed legal search, reasoning and citation verification across more than 14 million U.S. laws, regulations and case opinions. The launch targets a growing market for AI tools that need faster legal research and verified citations without hallucinations.

Why it matters: - TrustFoundry is trying to make legal search and reasoning easier to plug into AI agents, applications and platforms. - The API is designed for developers building legal AI products, as well as new agentic law firms and other workflows that need verified citations. - The company is positioning verified legal output as a core requirement for compliance work and AI systems that must follow the law.

What happened: - TrustFoundry announced the launch of its public API on May 7, 2026. - The API lets software developers, AI agents, legal AI companies and agentic law firms embed legal search, citation verification and legal reasoning into their products. - TrustFoundry says the system covers more than 14 million continuously updated U.S. laws, regulations and current case law. - The coverage spans all 50 states, Washington, D.C. and more than 2,000 courthouses. - The API is available at TrustFoundry.ai. - Developer plans start at $50 per month and use usage-based pricing. - Discounted startup and enterprise plans are also available. - Lawyers and paralegals can now use the legal search and reasoning product directly.

The details: - TrustFoundry’s Fast Legal Search uses concept search to match a described situation to applicable laws, cases and regulations. - The company says the search also uses a fact-based matching model to rank case law by similarity between case facts and query facts. - Fast search returns detailed summaries and links to source documents. - TrustFoundry says fast search responses take 3 to 9 seconds. - The company says that speed reduces the compute burden on agents and large language models and saves time and tokens. - Agentic Search is a research tool that builds a plan, runs multiple searches and applies legal reasoning. - TrustFoundry says Agentic Search produces analysis supported by real citations and verified pull-quotes. - Agentic Searches typically take one to two minutes. - Document Validator scans text for suspicious or questionable citations. - TrustFoundry says the validator can review documents prepared outside the company’s system and detect hallucinations. - The company says the API returns only verified citations.

Between the lines: - TrustFoundry is entering a crowded legal AI market with a pitch built around speed, citation quality and lower cost. - The company’s message suggests a gap between traditional legal search products and the needs of AI-native workflows. - The emphasis on verification reflects growing concern that legal AI tools can produce incorrect or unsupported answers. - The public API model could make legal search infrastructure more accessible to smaller developers and startups.

What’s next: - TrustFoundry expects more legal AI use cases as compliance-heavy industries and autonomous AI systems need embedded legal reasoning. - The company says demand for embedded legal search and reasoning will continue to grow as AI adoption accelerates. - TrustFoundry says lawyers and paralegals can now test the product firsthand as the API rolls out.

The bottom line: - TrustFoundry is betting that legal AI will need the same kind of embeddable infrastructure that software teams already use for search and verification.