Discover / www.agenttax.io

AgentTax

□ No challenge detected

US sales tax calculation API for AI-agent commerce. Returns the combined state+local rate, taxability by work type, economic-nexus alerts and a confidence score for all 50 states + DC. Pay per call in USDC on Base via x402 ($0.005) or use an API key.

x402
Base
USDC
Finance

Challenge detected: 0 of the last 3 checks
Last checked: 17 Oct, 07:50 UTC
In our index since: 14 Oct 2026

Endpoint

curl -i https://www.agenttax.io
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/www.agenttax.io

Recent checks

14 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.17 Oct 2026

All 3 checks

When (UTC)	Result	HTTP	Response
17 Oct, 07:50 UTC	No challenge detected	200	229ms
15 Oct, 19:10 UTC	No challenge detected	200	42ms
14 Oct, 08:45 UTC	No challenge detected	200	183ms

Questions

Did our last probe detect a payment challenge?

No. At our last probe on 17 Oct, 07:50 UTC, we detected no payment challenge.

What payment terms does AgentTax advertise?

The listing advertises x402, Base and USDC. Check the seller's current payment challenge and authentication requirements before paying.

Where is AgentTax listed?

In x402-list.com. Superstables first indexed it on 14 Oct 2026.

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