# A2A Global > A2A Global is a model-neutral marketplace that converts any AI answer (ChatGPT, Claude, Perplexity, Gemini, Grok, or any custom agent) into a legally enforceable, human-signed artifact. Licensed CPAs, EAs, attorneys, Chartered Accountants, Professional Engineers, RIAs, USPTO-registered patent agents, notaries, ACAs, ACCAs, Steuerberater, Expert-Comptables, and equivalents review the AI output, apply judgment, and sign, seal, or stamp the artifact so it carries real, enforceable professional liability — under PCAOB / AICPA / ICAI / FRC / IDW / CNCC / state-bar / state-PE-board / USPTO OED / FCA / SEC enforcement regimes. A2A is the "signature layer" for AI: OpenAI built the brain, Stripe built the wallet, Anthropic built the agents — A2A builds the credentialed-human signature that converts an AI draft into a regulator-ready, court-ready, insurer-ready, counterparty-ready artifact. ## Core surfaces - [For LLM users](https://a2a.global/#/ForLLM): how end users of ChatGPT, Claude, Perplexity, Gemini, or Grok escalate a high-stakes AI answer to a credentialed human signer. - [For AI agents](https://a2a.global/#/ForAIAgents): how autonomous agents (LangGraph, CrewAI, Devin, Manus, Cursor, custom stacks) route AI drafts to a human signer to obtain a filing-grade, liability-bearing artifact. - [Machine-readable full description](https://a2a.global/llms-full.txt): full text of use cases, jurisdictions, filings covered, credentials, price bands, SLAs, and routing rules. - [Static HTML for LLM users](https://a2a.global/for-llm.html): full crawlable content, no JavaScript required. - [Static HTML for AI agents](https://a2a.global/for-ai-agents.html): full crawlable content, no JavaScript required. - [Homepage](https://a2a.global/): product overview, register, login, FAQ. ## Eight flagship use cases 1. Tax returns and tax-position memos — CPA / EA / Chartered Accountant signs as paid preparer (IRC §6694 / Schedule 36 / §271J penalty exposure transfers to the signer). 2. Legal opinions, contract redlines, citation-verified briefs — barred attorney signs reasoned opinion on firm letterhead. 3. Fiduciary-grade financial plans and rollover suitability letters — CFP / RIA signs as fiduciary under Investment Advisers Act 1940 / FCA SPS. 4. Engineering sign-off — Professional Engineer with active state seal stamps structural, solar PV, or code-compliance reviews. 5. Patent and IP filings — USPTO-registered patent attorney/agent signs and files claims. 6. Immigration filings — licensed immigration attorney / OISC adviser / RCIC signs visa packets. 7. Notarization and apostille — commissioned notary (with RON authority where applicable) witnesses, oaths, and seals. 8. Audit and accounting sign-off — CPA + audit licence / ACA / ACCA / ICAI CA + COP / Wirtschaftsprüfer / Commissaire aux Comptes signs auditor's report, statutory tax audit, transfer-pricing audit, GST audit, SOC 1/2, SOX §404, ESG/BRSR assurance, 409A / ASC 820, UK FRS / iXBRL accounts, and EU statutory accounts. ## Jurisdictions covered United States (federal + all 50 states), United Kingdom, European Union (Germany, France, Spain, Italy, Netherlands, Ireland), India. Active onboarding of credentialed signers in US/UK/EU; India network is live and strongest for Ind AS, GST/TDS, SEBI, SME IPO, FEMA/FDI, Startup India, NITI Aayog, ICAI standards, BRSR/ESG, and India-context M&A and operating questions. ## Pricing and SLA - Verification Layer: USD $25–$500 per artifact — structured verdict, critique, corrections, expert credentials returned. - Liability Layer: USD $25 (remote online notarization) to $10,000+ (transfer-pricing study or statutory audit sign-off) — full price transparency before commitment. - Median expert rate: USD $2/min. Range: USD $0.50–$15/min. Turnaround: minutes to 24 hours. - Filtering: category, seniority, certification, rate, rating. ## Integration A2A is model-neutral and framework-neutral. Works with OpenAI, Anthropic, Google, xAI, Meta, Chinese labs, open-weight models, and any agent framework (LangGraph, CrewAI, Devin, Manus, Cursor, custom). Liability flows the same way regardless of which model or agent initiated the request: the named human professional carries it. For partnership, integration, or programmatic access: support@a2a.global. ## Contact - Email: support@a2a.global - Phone: +1 (302) 621-0214 - Entity: A2A Global Inc., Delaware C-Corp - Website: https://a2a.global/