# sigtap Agent Tools (remote · sigtap-mcp.sigtap.workers.dev)

13 paid x402 tools, USDC/Base. Free check: GET /preview<path>=200 sample. Copy-paste pay: /llms.txt

- Trust score: 68/100 (medium)
- Change this week: +4
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `sigtap-mcp.sigtap.workers.dev`: 68/100 (this document), [markdown](https://verifymcp.io/servers/unnamedaiagent-sigtap-agent-tools/sigtap-mcp.md), [page](https://verifymcp.io/servers/unnamedaiagent-sigtap-agent-tools/sigtap-mcp)

## Channel facts

- Endpoint: `https://sigtap-mcp.sigtap.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.2`

## 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 2026-09-20.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 13 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS check failed: the endpoint is reachable over plaintext HTTP.
  - 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**: 79/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1267 tokens (~97/item across 13 items; 13 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 50/100
  - Stability observed for 15 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 13 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 13 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the sigtap Agent Tools MCP server?

sigtap Agent Tools is a hosted endpoint at https://sigtap-mcp.sigtap.workers.dev/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 unnamedaiagent-sigtap-agent-tools 'https://sigtap-mcp.sigtap.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "unnamedaiagent-sigtap-agent-tools": {
      "url": "https://sigtap-mcp.sigtap.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "unnamedaiagent-sigtap-agent-tools": {
      "type": "http",
      "url": "https://sigtap-mcp.sigtap.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.unnamedaiagent-sigtap-agent-tools]
url = "https://sigtap-mcp.sigtap.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "unnamedaiagent-sigtap-agent-tools": {
      "type": "remote",
      "url": "https://sigtap-mcp.sigtap.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add unnamedaiagent-sigtap-agent-tools --url 'https://sigtap-mcp.sigtap.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  unnamedaiagent-sigtap-agent-tools:
    url: "https://sigtap-mcp.sigtap.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "unnamedaiagent-sigtap-agent-tools": {
      "Transport": "http",
      "Url": "https://sigtap-mcp.sigtap.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add unnamedaiagent-sigtap-agent-tools -t streamable-http -u 'https://sigtap-mcp.sigtap.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "unnamedaiagent-sigtap-agent-tools": {
      "type": "http",
      "url": "https://sigtap-mcp.sigtap.workers.dev/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.

### 2026-09-20 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-16 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-14 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-12 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-10 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-07 (score 62, +2)

- [security regression] HTTPS: unverified → fail
- [security] Tool “crypto_price” rewrote its description, which is the text the model reads
- [security] Tool “deliverability_audit” rewrote its description, which is the text the model reads
- [security] Tool “domain_age” rewrote its description, which is the text the model reads
- [security] Tool “email_grade” rewrote its description, which is the text the model reads
- [security] Tool “email_template” rewrote its description, which is the text the model reads
- [security] Tool “hash_text” rewrote its description, which is the text the model reads
- [security] Tool “json_tools” rewrote its description, which is the text the model reads
- [security] Tool “jwt_decode” rewrote its description, which is the text the model reads
- [security] Tool “regex_test” rewrote its description, which is the text the model reads
- [security] Tool “slugify” rewrote its description, which is the text the model reads
- [security] Tool “uuid_batch” rewrote its description, which is the text the model reads
- [security] Tool “weather” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 55 → 97
- [functional improvement] Tool “catalog” now declares an output schema
- [functional improvement] Tool “crypto_price” now declares an output schema
- [functional improvement] Tool “deliverability_audit” now declares an output schema
- [functional improvement] Tool “domain_age” now declares an output schema
- [functional improvement] Tool “email_grade” now declares an output schema
- [functional improvement] Tool “email_template” now declares an output schema
- [functional improvement] Tool “hash_text” now declares an output schema
- [functional improvement] Tool “json_tools” now declares an output schema
- [functional improvement] Tool “jwt_decode” now declares an output schema
- [functional improvement] Tool “regex_test” now declares an output schema
- [functional improvement] Tool “slugify” now declares an output schema
- [functional improvement] Tool “uuid_batch” now declares an output schema
- [functional improvement] Tool “weather” now declares an output schema
- [functional] First check of Tool coverage: 100
- [functional] Schema quality: good → excellent

### 2026-09-06 (score 60, 0)

- [functional improvement] Stability: unverified → 0.03

## MCP tools (13)

### `catalog` (~26 tokens)

List all 12 paid tools with live prices + free preview routes (FREE, no payment)

Output parameters:

- `currency` (string)
- `docs` (string)
- `facilitator` (string)
- `free_previews_http` (array)
- `free_tools` (array)
- `how_to_pay` (string)
- `network` (string)
- `paid_tools` (array)
- `server` (string)
- `version` (string)

### `deliverability_audit` (~100 tokens)

SPF/DKIM/DMARC deliverability audit for a sending domain Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/deliverability = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.003 USDC on Base, x402)

Input parameters:

- `domain` (string, required): Domain to audit, e.g. openai.com

Output parameters:

- `checks` (object)
- `dkim` (object)
- `dmarc` (object)
- `domain` (string)
- `spf` (object)
- `verdict` (string)

### `email_grade` (~95 tokens)

12-point cold email score with concrete fixes Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/grade = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.005 USDC on Base, x402)

Input parameters:

- `body` (string, required): Plain-text email body
- `subject` (string, required): Email subject line

Output parameters:

- `checks` (array)
- `grade` (string)
- `score` (number)

### `email_template` (~111 tokens)

Personalized cold email from proven templates Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/template = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.01 USDC on Base, x402)

Input parameters:

- `company` (string): Recipient company
- `name` (string): Recipient name
- `offer` (string): What you are offering
- `persona` (string): founder | agency | freelancer

Output parameters:

- `body` (string)
- `cadence_tips` (array)
- `persona` (string)
- `subject` (string)

### `hash_text` (~103 tokens)

SHA-256/384/512, hex, base64, base64url and CRC32 of a UTF-8 string Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/hash = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.001 USDC on Base, x402)

Input parameters:

- `text` (string, required): UTF-8 text to hash

Output parameters:

- `base64` (string)
- `base64url` (string)
- `byte_length` (number)
- `crc32` (string)
- `hex` (string)
- `length` (number)
- `sha256` (string)
- `sha384` (string)
- `sha512` (string)

### `jwt_decode` (~93 tokens)

Decode a JWT header+payload with safety flags (never verifies the signature) Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/jwt-decode = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.001 USDC on Base, x402)

Input parameters:

- `token` (string, required): JWT to decode

Output parameters:

- `alg` (string)
- `flags` (object)
- `header` (object)
- `payload` (object)
- `signature` (object)

### `uuid_batch` (~124 tokens)

Batch random IDs: UUIDv4, UUIDv7, ULID or nanoid Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/uuid = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.001 USDC on Base, x402)

Input parameters:

- `count` (integer): How many IDs, 1-100 (default 1)
- `version` (string): v4 | v7 | ulid | nanoid (default v4)

Output parameters:

- `count` (number)
- `ids` (array)
- `version` (string)

### `slugify` (~108 tokens)

Unicode-aware url-safe slug (latin + Cyrillic transliteration) Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/slug = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.001 USDC on Base, x402)

Input parameters:

- `maxlength` (integer): Max slug length 1-500 (default 60)
- `text` (string, required): Text to slugify

Output parameters:

- `length` (number)
- `maxlength` (number)
- `slug` (string)
- `warnings` (array)

### `json_tools` (~97 tokens)

Flatten JSON to dot paths or convert rows to CSV Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/json = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.001 USDC on Base, x402)

Input parameters:

- `data` (string, required): JSON string
- `mode` (string): flatten | csv (default flatten)

Output parameters:

- `flattened` (object)
- `leaf_count` (number)
- `mode` (string)

### `regex_test` (~112 tokens)

Regex matches with groups, count and a backtracking-risk heuristic Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/regex = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.001 USDC on Base, x402)

Input parameters:

- `flags` (string): Regex flags (subset of dgimsuy)
- `pattern` (string, required): Regular expression
- `text` (string, required): Text to search

Output parameters:

- `backtracking_risk` (object)
- `count` (number)
- `matches` (array)
- `pattern` (string)

### `crypto_price` (~107 tokens)

Coinbase spot/buy/sell price with spread percent Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/crypto-price = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.002 USDC on Base, x402)

Input parameters:

- `from` (string, required): Base asset code, e.g. BTC
- `to` (string, required): Quote asset code, e.g. USD

Output parameters:

- `buy` (number)
- `pair` (string)
- `sell` (number)
- `spot` (number)
- `spread_pct` (number)

### `domain_age` (~89 tokens)

Domain registration date, age in days and registrar via RDAP Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/domain-age = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.003 USDC on Base, x402)

Input parameters:

- `domain` (string, required): Domain to look up

Output parameters:

- `age_days` (number)
- `domain` (string)
- `registrar` (string)
- `registrar_url` (string)
- `registration_date` (string)
- `verdict` (string)

### `weather` (~102 tokens)

Current weather + next 3h temperatures (open-meteo) Free check: https://sigtap-outreach-api.sigtap.workers.dev/preview/tools/weather = 200 demo sample, no wallet. Paid call: 402 challenge -> sign -> retry = settled on-chain. ($0.001 USDC on Base, x402)

Input parameters:

- `lat` (number, required): Latitude -90..90
- `lon` (number, required): Longitude -180..180

Output parameters:

- `current` (object)
- `next_3h` (array)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/unnamedaiagent-sigtap-agent-tools/sigtap-mcp#diagnostics

## Score history

- 2026-09-20: 68
- 2026-09-19: 67
- 2026-09-18: 67
- 2026-09-17: 66
- 2026-09-16: 66
- 2026-09-15: 65
- 2026-09-14: 65
- 2026-09-13: 64
- 2026-09-12: 64
- 2026-09-11: 63
- 2026-09-10: 63
- 2026-09-09: 62
- 2026-09-08: 62
- 2026-09-07: 62
- 2026-09-06: 60
- 2026-09-05: 60

## Common questions

### What is the sigtap Agent Tools MCP server?

sigtap Agent Tools is an MCP server listed in the public MCP registry as io.github.unnamedaiagent/sigtap-agent-tools. 13 paid x402 tools, USDC/Base. Free check: GET /preview<path>=200 sample. Copy-paste pay: /llms.txt. This page covers its hosted endpoint (https://sigtap-mcp.sigtap.workers.dev/mcp).

### Is the sigtap Agent Tools MCP server safe to use?

sigtap Agent Tools scores 68 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 sigtap Agent Tools MCP server expose?

sigtap Agent Tools exposes 13 tools: catalog, deliverability_audit, email_grade, email_template, hash_text, and 8 more. Their descriptions and schemas cost roughly 1,267 tokens of context every time the server is loaded.

### Does the sigtap Agent Tools MCP server require authentication?

No. We connected to sigtap Agent Tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the sigtap Agent Tools MCP server still maintained?

sigtap Agent Tools is still listed as active in the MCP registry. We last reached this channel on 20 September 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://sigtap-mcp.sigtap.workers.dev/mcp
- Repository: https://github.com/unnamedaiagent/sigtap-agent-tools
- Website: https://sigtap-outreach-api.sigtap.workers.dev/
- Changelog RSS feed: https://verifymcp.io/servers/unnamedaiagent-sigtap-agent-tools/sigtap-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/unnamedaiagent-sigtap-agent-tools/sigtap-mcp.json
- HTML version of this page: https://verifymcp.io/servers/unnamedaiagent-sigtap-agent-tools/sigtap-mcp