AgentTax
Now processing x402 transactions

The transparent tax engine for
agentic commerce.

Real-time sales tax calculation, economic nexus monitoring, and 1099-DA reporting for AI agent transactions across 50 states + DC + 105 local jurisdictions.

$npm install @agenttax/sdk
POST /api/v1/calculate — 200 OK
✓ 99% confidence
Austin, TX
148ms
Works with every payment protocol
x402Stripe MPPMCPLangChainCrewAIAmpersendx402Stripe MPPMCPLangChainCrewAIAmpersend
COVERAGE

50 states + DC. 105 local jurisdictions.

State rates, local rates, AI-specific classification rules, B2B exemptions, and per-state taxability matrices. Updated daily against 7 independent sources.

0+DC
State jurisdictions
0
Local rates
0%
Test pass rate
<0ms
Response time
Updated daily against 7 independent sources
View the full classification guide →
Digital taxable
Special AI/SaaS rules
B2B exempt
No state sales tax
FEATURES

Built for agent-to-agent transactions.

Every feature designed for machine callers at machine speed — not human checkout flows.

⚡
Real-Time Calculation
One API call returns tax amount, rate, jurisdiction, classification, and confidence score. Sub-200ms response.
📍
Economic Nexus Monitoring
Per-agent revenue tracking across 45 sales-tax states. Automatic alerts at 80% of each state’s Wayfair threshold.
🏛️
AI Work-Type Classification
Compute, research, content, consulting, trading — each classified by economic category with per-state taxability rules.
📊
Capital Gains Tracker
FIFO, LIFO, and Specific ID cost basis methods. Realized gain/loss on every sell. 1099-DA export ready.
🔗
Protocol Agnostic
Works with x402, Stripe MPP, MCP, or any payment rail. Tax compliance is a layer above the protocol.
🔍
Audit-Ready Records
Full audit trail on every calculation: jurisdiction chain, exemptions evaluated, classification basis, policy references.
DEVELOPER EXPERIENCE

One API call. Full compliance.

Ship tax-compliant agent transactions in minutes, not months. A single REST call handles jurisdiction lookup, classification, rate application, and audit trail.

RequestcURL
# Calculate sales tax for a compute transaction
curl -X POST https://agenttax.io/api/v1/calculate \
  -H "Content-Type: application/json" \
  -H "X-API-Key: atx_live_..." \
  -d '{
    "role": "seller",
    "amount": 400,
    "buyer_state": "TX",
    "buyer_zip": "78701",
    "transaction_type": "compute",
    "work_type": "compute",
    "counterparty_id": "agent-042"
  }'
ResponseJSON
{
  "success": true,
  "sales_tax": {
    "amount": 33.00,
    "combined_rate": 0.0825,
    "jurisdiction": "Austin, TX",
    "classification": "data_processing"
  },
  "confidence": {
    "score": 99,
    "level": "high"
  },
  "nexus_alerts": [],
  "transaction_id": "txn_a3f8c..."
}
ACCESS

Two ways to access AgentTax

API key account or x402 pay-per-call — your agent chooses.

x402 is an open payment protocol that lets AI agents pay with USDC — no account, no API key, just HTTP. AgentTax supports both access methods.

FREE TIER
Option 1: API Key Account
$0/mo to start · 100 calls free

Sign up via API for persistent state. Transaction history, capital gains tracking, nexus monitoring, and 1099 export.

Everything in Pay Per Call
Transaction history + audit trail
Capital gains tracking (FIFO/LIFO)
Nexus threshold monitoring + alerts
1099-DA export for IRS reporting
Signup via API — no dashboard required
NO SIGNUP
Option 2: x402 Pay Per Call
$0.001 per calculation

USDC on Base via x402 protocol. Your agent discovers the API, reads the schema from the 402 response, pays, and gets the result. Zero friction.

Tax calculation with full reasoning
50-state + DC jurisdiction coverage
Confidence scoring + source attribution
Self-documenting 402 responses
1
Hit endpoint
GET /api/v1/calculate
→
2
Get 402 + schema
fields, types, examples
→
3
Pay $0.001 USDC
X-PAYMENT header
→
4
Get tax result
amount, rate, reasoning
x402 Moves the Money
Coinbase's open standard turns HTTP 402 into instant stablecoin payments.
Every Payment is a Potential Tax Event
x402 handles payment but not compliance. Sales tax obligations vary by state, service type, and nexus status.
AgentTax Closes the Loop
One API call calculates estimated tax, identifies the jurisdiction, and explains the reasoning. Always verify with a qualified tax professional.
OPEN SOURCE

Built in the open.

PRICING

Start free. Scale as you grow.

No sales calls. No hidden fees. Published pricing for every tier.

Free
$0/mo
For testing and development
100 API calls/month
All 50 states + DC + local
Full audit trail
MOST POPULAR
Starter
$25/mo
For agents in production
10,000 API calls/month
Nexus monitoring
1099-DA export
Growth
$99/mo
For scaling operations
100,000 API calls/month
$0.01/call overage
Priority support
Pro
$199/mo
For high-volume agents
1M API calls/month
$0.005/call overage
Dedicated support

Start calculating tax in 30 seconds.

Free tier includes 100 API calls/month with full coverage. No credit card required.

AgentTax
Tax intelligence for AI-driven commerce. 50-state coverage, verified daily.

© 2026 Agentic Tax Solutions LLC. Tax rates verified daily against Tax Foundation, Sales Tax Institute, state DOR websites, Anrok, TaxJar, TaxCloud, and Kintsugi. AgentTax provides tax calculations for informational purposes only. Consult a qualified tax professional for compliance decisions.