# US Sales Tax Economic Nexus Check

> Which US states must a remote seller register in for sales tax? Every state's nexus rule. Sourced.

- name: io.github.Nero-Engine/us-sales-tax-nexus
- version: 1.0.0
- connection class: unknown (unknown)
- trust: 58/100 flags: no-repository
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.Nero-Engine%2Fus-sales-tax-nexus
- tools: https://api.protogrid.dev/v1/servers/io.github.Nero-Engine%2Fus-sales-tax-nexus/tools

**Not classified yet.** The remote endpoints have not been probed successfully, or the listing has nothing to connect to.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "us-sales-tax-nexus": {
      "type": "http",
      "url": "https://us-sales-tax-nexus.nerolabs.workers.dev/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 29
- freshness: 100
- provenance: 45
- drivers: +website -unreachable(1 failures) +updated-10d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: list_capabilities (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); check_economic_nexus (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); list_upcoming_nexus_changes (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 848 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 4, about 848 tokens to load them all
- tool set hash: 1a30271fd8a54be30d5a0ec34f6c74b3
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.Nero-Engine/us-sales-tax-nexus.svg)](https://protogrid.dev/servers/io.github.Nero-Engine/us-sales-tax-nexus)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://us-sales-tax-nexus.nerolabs.workers.dev/mcp (streamable-http, auth none, reachable false, uptime30d 0.9756098)

## Packages

_none_

## Tools (4)

- `check_economic_nexus`: Checks which US states a remote seller (no office, staff or stock in the state) must register in to collect sales tax, from its sales into each state. Give sales_by_state with the dollar sales and number of transactions (orders) per state, the period those figures cover, and whether they include sales made through marketplaces such as Amazon or Etsy. Returns states where the seller is over the economic nexus threshold (must register), states close to it (80 percent or more), states under it, and for each the threshold, the measurement period the state uses, what sales count (gross, retail or taxable only), whether marketplace sales count, when registration must happen, and the state revenue department source. Unclear cases give the SAFE answer (treated as over) with what it depends on. Free.
- `list_capabilities`: Lists coverage (45 sales tax states plus DC, and the 5 states with no statewide sales tax), the date the data was last checked, and related Nero Labs Rules servers. Free.
- `list_nexus_thresholds`: Lists the economic nexus threshold of every US sales tax state (or one state) on a date: dollar and transaction thresholds, and/or logic, measurement period, what counts, marketplace rules, when to register and the official source. Also lists the states with no statewide sales tax. Free.
- `list_upcoming_nexus_changes`: Lists economic nexus threshold changes in a date window (for example states dropping the 200 transaction test), soonest first, with the old and new rule and source. Use a past from_date to see recent changes. Free.