# io.usefulapi/basis-theory (remote · basis-theory.usefulapi.io)

Read token metadata, applications, audit logs, proxies and usage in the PCI vault.

- Trust score: 76/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-03

## Components

- remote · `basis-theory.usefulapi.io`: 76/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-basis-theory/basis-theory.md), [page](https://verifymcp.io/servers/io-usefulapi-basis-theory/basis-theory)

## Channel facts

- Endpoint: `https://basis-theory.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-03.

- **Endpoint Security**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, but the challenge carries no valid RFC 9728 metadata, so a client cannot discover where to get a token.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 81/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1164 tokens (~68/item across 17 items; 17 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 10/100
  - Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 17 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 17 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the io.usefulapi/basis-theory MCP server?

io.usefulapi/basis-theory is a hosted endpoint at https://basis-theory.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-usefulapi-basis-theory 'https://basis-theory.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-basis-theory": {
      "url": "https://basis-theory.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-basis-theory": {
      "type": "http",
      "url": "https://basis-theory.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-basis-theory]
url = "https://basis-theory.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-basis-theory": {
      "type": "remote",
      "url": "https://basis-theory.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-basis-theory --url 'https://basis-theory.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-basis-theory:
    url: "https://basis-theory.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-basis-theory": {
      "Transport": "http",
      "Url": "https://basis-theory.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-basis-theory -t streamable-http -u 'https://basis-theory.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-basis-theory": {
      "type": "http",
      "url": "https://basis-theory.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-03 (score 76, −2)

- [security regression] Authorization: pass → fail

### 2026-10-02 (score 78, +1)

- [functional] Server version: 1.3.0 → 1.5.1

### 2026-10-01 (score 77, +4)

- [security improvement] HTTPS: unverified → pass
- [security] First check of Authorization: partial
- [functional improvement] Stability: unverified → 0.03
- [functional] Server version: 1.0.0 → 1.3.0

### 2026-09-30 (score 73, +45)

- [security improvement] Authorization: unverified → pass
- [security improvement] Injection markers: unverified → pass
- [security] First check of Judged manipulation: pass
- [functional regression] MCP protocol: unverified → fail
- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: excellent
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: pass
- [functional] First check of Tool coverage: 100

### 2026-09-29 (score 28)

First indexed and scored.

## MCP tools (17)

### `basis_theory_list_tokens` (~149 tokens)

List tokens

List vault tokens as METADATA — id, type, container, fingerprint, metadata and timestamps. Does not return the underlying card number or PII. Basis Theory: GET /v2/tokens.

Input parameters:

- `container` (string): Only tokens in this container path, e.g. /pci/high/.
- `fingerprint` (string): Only tokens sharing this fingerprint — how you find duplicates of the same card.
- `size` (integer): Page size, 1-100.
- `start` (string): Cursor from the previous page's pagination.next. Omit for the first page.
- `type` (string): Only tokens of this type, e.g. card, bank, token.

### `basis_theory_search_tokens` (~122 tokens)

Search tokens

Search tokens with Basis Theory's query syntax over metadata, e.g. metadata.customer_id:"cus_1". Returns metadata only. Read-only despite being a POST — the query goes in the body. Basis Theory: POST /v2/tokens/search.

Input parameters:

- `query` (string, required): Query string, e.g. type:card AND metadata.customer_id:"cus_1".
- `size` (integer): Page size, 1-100.
- `start` (string): Cursor from the previous page's pagination.next. Omit for the first page.

### `basis_theory_get_token` (~80 tokens)

Get one token

Fetch a single token by id. Returns metadata, container, fingerprint and timestamps. WARNING: if the configured API key carries a reveal permission, the response also contains the token's plaintext data — issue this server a read-only management key instead. Basis Theory: GET /tokens/{id}.

Input parameters:

- `token_id` (string, required): The token's id.

### `basis_theory_list_applications` (~90 tokens)

List applications

List the applications (API-key holders) in the tenant, with their types and permissions. Basis Theory: GET /applications.

Input parameters:

- `page` (integer): 1-based page number (offset pagination).
- `size` (integer): Page size, 1-100.
- `type` (string): Only applications of this type, e.g. private, public, management, expiring.

### `basis_theory_get_application` (~42 tokens)

Get one application

Fetch a single application with its type and permission list. Basis Theory: GET /applications/{id}.

Input parameters:

- `application_id` (string, required): The application's id.

### `basis_theory_whoami` (~45 tokens)

Identify the configured key

Return the application the configured BT-API-KEY belongs to — the fastest way to check which permissions this server actually has. Basis Theory: GET /applications/key.

### `basis_theory_list_logs` (~137 tokens)

List audit logs

List audit-log entries — who did what to which entity and when. The tool for answering 'who touched this token?'. Basis Theory: GET /logs.

Input parameters:

- `end_date` (string): ISO-8601 upper bound.
- `entity_id` (string): Only entries for this entity id.
- `entity_type` (string): Only entries for this entity type, e.g. token, application, proxy.
- `page` (integer): 1-based page number (offset pagination).
- `size` (integer): Page size, 1-100.
- `start_date` (string): ISO-8601 lower bound.

### `basis_theory_list_log_entity_types` (~38 tokens)

List log entity types

List the entity types the audit log records — the valid values for entity_type. Basis Theory: GET /logs/entity-types.

### `basis_theory_list_proxies` (~76 tokens)

List proxies

List the proxies that forward requests to third parties, detokenizing in flight. Basis Theory: GET /proxies.

Input parameters:

- `name` (string): Filter by proxy name.
- `page` (integer): 1-based page number (offset pagination).
- `size` (integer): Page size, 1-100.

### `basis_theory_get_proxy` (~45 tokens)

Get one proxy

Fetch a single proxy with its destination URL and transform configuration. Basis Theory: GET /proxies/{id}.

Input parameters:

- `proxy_id` (string, required): The proxy's id.

### `basis_theory_list_reactors` (~78 tokens)

List reactors

List reactors — the serverless functions that run against detokenized data inside the vault. Basis Theory: GET /reactors.

Input parameters:

- `name` (string): Filter by reactor name.
- `page` (integer): 1-based page number (offset pagination).
- `size` (integer): Page size, 1-100.

### `basis_theory_get_reactor` (~42 tokens)

Get one reactor

Fetch a single reactor with its configuration. Basis Theory: GET /reactors/{id}.

Input parameters:

- `reactor_id` (string, required): The reactor's id.

### `basis_theory_list_permissions` (~50 tokens)

List permissions

List the permissions that can be granted to an application, optionally for one application type. Basis Theory: GET /permissions.

Input parameters:

- `application_type` (string): Only permissions valid for this application type.

### `basis_theory_list_roles` (~26 tokens)

List roles

List the roles available for tenant members. Basis Theory: GET /roles.

### `basis_theory_get_tenant` (~32 tokens)

Get the tenant

Fetch the current tenant — name, id and settings. Basis Theory: GET /tenants/self.

### `basis_theory_get_tenant_usage` (~46 tokens)

Get the tenant usage report

Fetch the tenant's usage report — token counts by type and container, and monthly API call volume. Basis Theory: GET /tenants/self/reports/usage.

### `basis_theory_list_tenant_members` (~66 tokens)

List tenant members

List the people with access to the tenant, and their roles. Basis Theory: GET /tenants/self/members.

Input parameters:

- `page` (integer): 1-based page number (offset pagination).
- `size` (integer): Page size, 1-100.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-basis-theory/basis-theory#diagnostics

## Score history

- 2026-10-03: 76
- 2026-10-02: 78
- 2026-10-01: 77
- 2026-09-30: 73
- 2026-09-29: 28

## Common questions

### What is the io.usefulapi/basis-theory MCP server?

io.usefulapi/basis-theory is an MCP server listed in the public MCP registry as io.usefulapi/basis-theory. Read token metadata, applications, audit logs, proxies and usage in the PCI vault. This page covers its hosted endpoint (https://basis-theory.usefulapi.io/mcp).

### Is the io.usefulapi/basis-theory MCP server safe to use?

io.usefulapi/basis-theory scores 76 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the io.usefulapi/basis-theory MCP server expose?

io.usefulapi/basis-theory exposes 17 tools: basis_theory_list_tokens, basis_theory_search_tokens, basis_theory_get_token, basis_theory_list_applications, basis_theory_get_application, and 12 more. Their descriptions and schemas cost roughly 1,164 tokens of context every time the server is loaded.

### Does the io.usefulapi/basis-theory MCP server require authentication?

Yes. io.usefulapi/basis-theory asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the io.usefulapi/basis-theory MCP server still maintained?

io.usefulapi/basis-theory is still listed as active in the MCP registry. We last reached this channel on 3 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://basis-theory.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-basis-theory/basis-theory.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-basis-theory/basis-theory.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-basis-theory/basis-theory