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AgentTax
│
Network
50-state coverage · Built for autonomous agents · API-first

The Transparent Tax Engine for
AI-Driven Commerce

Capital Gains, Sales tax, use tax, nexus monitoring for any AI agent transaction — whether your agents pay via direct API or x402. 51 US jurisdictions. Every response explains why.

Every rate includes its source and confidence score. Verified daily against 7 independent sources.

Request
POST /api/v1/calculate

{
  "role": "seller",
  "amount": 2500.00,
  "buyer_state": "TX",
  "work_type": "compute"
}
Response
{
  "success": true,
  "jurisdiction": "Texas",
  "sales_tax": {
    "rate": 0.0625,
    "taxable_pct": 0.80,
    "amount": 125.00,
    "note": "TX §151.351 — 80% taxable"
  },
  "confidence": { "score": 92 }
}
Works with any AI agent or framework
Claude Code
Cursor
Codex CLI
OpenAI Agents
LangChain
CrewAI
AutoGPT
Windsurf
Cline
n8n
Make
Custom Agents

AI Agents Are Transacting. Tax Law Still Applies.

Every agent payment — compute, data, SaaS, content — may create tax obligations across 51 US jurisdictions.

Same transaction, different tax

A $10 compute job is taxable at 80% in TX, 6.625% in NJ, and $0 in IA if B2B. Depends on what the agent did, not how it paid.

Thresholds add up fast

An agent making $0.01 payments crosses $100K in a single state in months. That's a collection obligation nobody's tracking.

Both sides have obligations

Sellers may owe sales tax. Buyers may owe use tax if the seller didn't collect. Both need tracking from both perspectives.

One API Call. Full Tax Intelligence.

Every response includes the tax amount, jurisdiction, statute citation, and confidence score.

terminal
$ curl -X POST https://agenttax.io/api/v1/calculate \
  -H "X-API-Key: atx_live_your_key" \
  -d '{
    "role": "seller",
    "amount": 1000,
    "buyer_state": "TX",
    "transaction_type": "saas",
    "work_type": "compute",
    "counterparty_id": "agent_buyer_42"
  }'

{
  "success": true,
  "jurisdiction": "Texas",
  "classification_basis": "data_processing",
  "sales_tax": {
    "amount": 50.00,
    "rate": 0.0625,
    "taxable_pct": 0.80,
    "note": "TX Tax Code §151.351 — 20% statutory exemption"
  },
  "confidence": { "score": 85, "level": "high" },
  "total_tax": 50.00
}

Get Started in Minutes

01
Sign Up
Create a free account. Get your API key instantly.
02
Make a Request
POST your transaction details — amount, state, type.
03
Get Intelligence
Receive tax amount, rate, statute citation, and confidence score.
04
Stay Compliant
Track nexus thresholds, 1099 obligations, and transaction history.

Know what you owe

One API call calculates sales tax, use tax, and 1099 obligations for any transaction. Both sides — buyer and seller — handled automatically.

See why it's taxed

Every response explains its reasoning: which state, which rule, which rate. Your agents can verify decisions, not just trust them.

50 states. Daily verified.

Rates checked daily against 7 independent public sources. Discrepancies flagged for review. Every rate shows its source and confidence score.

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 an autonomous tax agent needs. See paid tiers →
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
51-state jurisdiction coverage
Confidence scoring + source attribution
Self-documenting 402 responses
How an AI Agent Uses AgentTax
Hit endpoint
GET /api/v1/calculate
Get 402 + schema
fields, types, examples
Pay $0.001 USDC
X-PAYMENT header
Get tax result
amount, rate, reasoning
x402 Moves the Money
Coinbase's open standard turns HTTP 402 into instant stablecoin payments. Your agent pays for any API — including this one — with USDC on Base.
Every Payment is a Potential Tax Event
x402 handles payment but not compliance. Sales tax obligations vary by state, service type, and nexus status — 51 jurisdictions, each with different rules.
AgentTax Closes the Loop
One API call before or after any x402 payment tells your agent exactly what tax is owed, why, and where. Autonomous compliance at machine speed.

Tax Rate Sources & Verification

Transparent, verifiable, AI-auditable

State Sales Tax Rates
Tax Foundation
All 50 states + DC state-level rates verified against the Tax Foundation's "State and Local Sales Tax Rates, 2026" dataset.
Verified Feb 25, 2026Data: Jan 1, 2026
Digital/SaaS Taxability
Multi-Source Cross-Referenced
SaaS and digital goods taxability per state verified against TaxJar (Stripe), TaxCloud, TaxValet, and Sales Tax Institute guidance.
4 SourcesPer-State Notes
Automated Verification
Daily Multi-Source Cross-Check
Rates verified daily against 7 independent public sources. Discrepancies are flagged and manually reviewed before any update is applied.
7 SourcesDaily Checks
Verify via API:GET /api/v1/ratesPOST /api/v1/verifyGET /api/v1/verify/status
Next review: April 1, 2026

Simple Pricing

Free
$0/mo
100 calls/mo
All tax endpoints
50-state coverage
Confidence scoring
MOST POPULAR
Starter
$25/mo
1,000 calls/mo
Everything in Free
1099 tracking
Nexus detection
Transaction history
$0.05/call overage
Pro
$199/mo
40,000 calls/mo
Everything in Starter
Bulk processing
Custom tax rules
$0.01/call overage
Dedicated support
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.