agenttax

AgentTax

Tax compliance tools for AI agent transactions. Use when the user or agent needs to:

• Calculate sales tax or use tax on a transaction
• Log trades for capital gains tracking
• Check tax rates by state
• Configure economic nexus states
• Export 1099-DA data

API docs: https://agenttax.io/api/v1/agents

Authentication

All requests use the header: X-API-Key: $AGENTTAX_API_KEY

Get a free API key (1,500 calls/month):

curl -s -X POST https://agenttax.io/api/v1/auth/signup \
  -H "Content-Type: application/json" \
  -d '{"email": "[email protected]", "password": "securepass", "agent_name": "my-agent", "agent_work_type": "compute"}'

Save the api_key.key from the response — it is only shown once.

Calculate Sales/Use Tax

Use when an AI agent buys or sells services, compute, API access, SaaS, or digital goods.

curl -s -X POST https://agenttax.io/api/v1/calculate \
  -H "X-API-Key: $AGENTTAX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "role": "ROLE",
    "amount": AMOUNT,
    "buyer_state": "STATE",
    "buyer_zip": "ZIP",
    "transaction_type": "TYPE",
    "work_type": "WORK_TYPE",
    "counterparty_id": "COUNTERPARTY",
    "is_b2b": IS_B2B
  }'

Required fields:

• role: "buyer" or "seller"
• amount: transaction amount in USD
• buyer_state: 2-letter US state code
• transaction_type: one of compute, api_access, data_purchase, saas, ai_labor, storage, digital_good, consulting, data_processing, cloud_infrastructure, ai_model_access, marketplace_fee, subscription, license, service
• counterparty_id: identifier for the other party

Optional fields:

• buyer_zip: 5-digit zip for local rate lookup (recommended — adds city/county tax)
• work_type: compute, research, information_service, content, consulting, trading (drives per-state classification). Send it only when you know it: it is a declared fact, not a guess. consulting is an exempt professional service in Arizona, and the consulting / trading exemptions apply only to a declared work type. Send it for an exact answer
• is_b2b: true/false (affects rates in MD, IA)
• seller_remitting: true/false (whether seller is collecting tax)