AgentTax

io.github.AgentTaxv1.1.1Updated Oct 8, 2026

US sales/use tax, nexus thresholds, capital gains and 1099-DA tools for AI agent transactions.

VerifiedSTDIODesktop onlyFinanceBusiness & Commerce

Overview

AI-generated overview

Lets an assistant log payments and trades, calculate US sales/use tax and capital gains, and check state nexus thresholds.

What it does
AgentTax provides tools for US tax compliance around AI agent and digital-service transactions. track_payment logs a received payment and returns tax owed, rate, taxable amount and a compliance note; calculate_tax gives a jurisdiction breakdown with audit trail and confidence score; ingest_transactions bulk-logs up to 100 transactions. It also covers nexus (get_nexus_thresholds, get_nexus, configure_nexus), rates (get_rates, get_local_rate, get_capital_gains_rates), trade logging with realized gain/loss, and a draft 1099-DA export.
When to use it
Use it if you run paid MCP tools, APIs or digital services and need to track US sales/use tax liability by buyer state, or if you need state nexus thresholds, sales tax rates, capital gains rates, or draft 1099-DA data for digital-asset trades.
Requirements
Runs locally over stdio via npx @agenttax/mcp-server, so Node.js is needed. An AgentTax account and the AGENTTAX_API_KEY environment variable unlock history and most tools; without a key it runs in demo mode at 50 calls per day. Network access to agenttax.io is required. Paid tiers start at $25/month.
Before you install
The server sends payment and trade details, including buyer state, zip, amounts and payment IDs, to AgentTax. AGENTTAX_API_KEY is a secret and is shown only once at signup. track_payment, ingest_transactions, configure_nexus, log_trade and export_1099_da write data to your account. The 1099-DA export is a draft, not a filed return, and tax results are informational rather than professional tax advice.

Installation

In SourceWeft

  1. Open AgentTax in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

AgentTax MCP Server

Tax compliance for MCP tool developers and AI agents, powered by AgentTax.

For MCP tool developers

If you build MCP tools that charge for usage, you have sales tax obligations in states where your buyers are located. Most payment processors don't handle this correctly for digital services.

Add AgentTax to your MCP setup and call track_payment after every payment. That's it.

json
{  "mcpServers": {    "agenttax": {      "command": "npx",      "args": ["@agenttax/mcp-server"],      "env": {        "AGENTTAX_API_KEY": "atx_live_your_key"      }    }  }}

After a payment:

track_payment({  amount: 49.00,  buyer_state: "TX",  buyer_zip: "78701",  description: "MCP API access — monthly subscription",  payment_id: "pi_stripe_abc123",  source: "stripe"})

Returns your tax liability, compliance status, and logs it to your account. All transactions are viewable in your AgentTax dashboard.

Stripe webhook (fully automated)

For fully automatic tax tracking without calling any tool manually, point your Stripe webhook to AgentTax:

  1. In Stripe Dashboard → Developers → Webhooks, add an endpoint: 
    https://agenttax.io/api/v1/webhooks/stripe?key=atx_live_YOUR_KEY
  2. Select events: payment_intent.succeeded, checkout.session.completed, invoice.paid, charge.succeeded
  3. Optional: set metadata.work_type on your Stripe products (compute | research | content | consulting | trading) for precise tax classification

Every payment is automatically classified, taxed, and logged. No code changes required.

Requires a billing address on the Stripe payment. Enable full address collection in your Stripe Checkout settings.

Install

Claude Code

bash
claude mcp add agenttax -- npx @agenttax/mcp-serverexport AGENTTAX_API_KEY=atx_live_your_key

Claude Desktop / Cursor / Windsurf

Add to your MCP config file:

json
{  "mcpServers": {    "agenttax": {      "command": "npx",      "args": ["@agenttax/mcp-server"],      "env": {        "AGENTTAX_API_KEY": "atx_live_your_key"      }    }  }}

Demo mode works without a key (50 calls/day, no account required). Tools marked "Yes" below need AGENTTAX_API_KEY.

Tools

ToolWhat it doesKey needed
track_paymentLog a payment you received and get your sales tax liability. The main tool for paid MCP servers and APIs.Demo works; key for history
calculate_taxFull sales/use tax calculation with jurisdiction breakdown, audit trail, confidence score and advisoriesDemo works; key for full response
ingest_transactionsBulk-log up to 100 transactions (e.g. x402 purchases), idempotent on external_tx_idYes
list_transactionsYour transaction history with running totalsYes
get_nexus_thresholdsEach state's economic nexus thresholds (revenue / transaction count), notes and DOR sourceNo
get_nexusThe states you have configured nexus inYes
configure_nexusSet the states you have nexus in (merge semantics)Yes
log_tradeLog a buy/sell; sells return realized gain/loss with cost basisYes
list_tradesTrades you have loggedYes
export_1099_daDraft Form 1099-DA payload for realized digital-asset gainsYes (Pro)
get_ratesState sales tax rates and digital-goods taxability, all 51 jurisdictions or oneNo
get_local_rateCombined state + local rate for a zip codeNo
get_capital_gains_ratesState short/long-term capital gains ratesNo
get_pricingMachine-readable pricing contractNo
check_healthAPI health and endpoint listNo

Read-only tools carry the MCP readOnlyHint annotation so clients can auto-approve them.

track_payment

track_payment({  amount: 49.00,  buyer_state: "TX",  buyer_zip: "78701",  description: "MCP tool subscription",  payment_id: "pi_stripe_abc123",  source: "stripe"})

Returns tax_owed, tax_rate, taxable, transaction_id and a compliance_note. Classification comes from description. Sellers get $0 in states where no nexus is configured; the response says so in nexus_warning.

calculate_tax

calculate_tax({  role: "buyer",  amount: 500,  buyer_state: "TX",  buyer_zip: "78701",  transaction_type: "compute",  work_type: "compute",  counterparty_id: "seller-agent-123",  is_b2b: true})

Optional fields: seller_state / seller_zip (origin-sourced intrastate sales in TX, UT, AZ, TN and some OH sales), use_context (Maryland B2B), digital_content_type (with transaction_type: "digital_good"), seller_remitting.

Nexus

get_nexus_thresholds({ state: "NY" })          // what triggers registrationconfigure_nexus({ nexus: { TX: { hasNexus: true, reason: "Economic nexus" } } })get_nexus()                                     // what you have configured

Capital gains and 1099-DA

log_trade({ asset_symbol: "ETH", trade_type: "buy", quantity: 2, price_per_unit: 2500, asset_class: "crypto" })log_trade({ asset_symbol: "ETH", trade_type: "sell", quantity: 1, price_per_unit: 3100, asset_class: "crypto" })export_1099_da({ year: 2026 })                  // draft, not a filed return

Get an API Key

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

All four fields are required; agent_work_type is one of compute, research, information_service, content, consulting, trading. Save the api_key.key from the response — it's only shown once.

Pricing

TierPriceCalls/month
Free$01,500
Starter$25/mo10,000
Growth$99/mo100,000
Pro$199/mo1,000,000
x402$0.005/call in USDC on BasePay per call, no signup

Current machine-readable pricing: get_pricing or GET https://agenttax.io/api/v1/pricing.

Links

License

MIT

Source: README.md at commit 3893fa2

Tools

0
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Version history

1
  1. v1.1.1LatestOct 8, 2026