sigtap Agent Tools MCP Server

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answering

sigtap Agent Tools is answering right now. Last checked 5 min ago. It exposes 13 tools. Last commit 8 Sep 2026.

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

Uptime history 5 days of history

5 days agonow

100.0%

Uptime 24h

93 of 93 checks

Tools

read from the server

643 ms

Response time

average over 24h

Stars

last commit 8 Sep 2026

What changed 12

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 8 September 2026. No other catalogue keeps this.

8 Sep 12 tool descriptions were rewritten crypto_price, deliverability_audit, domain_age and 9 more

Nothing serious here today

Today is the operative word: we check sigtap Agent Tools every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add sigtap-agent-tools --transport http https://sigtap-mcp.sigtap.workers.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 13

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

email_grade

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)

email_template

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)

catalog

catalog

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

crypto

crypto_price

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)

deliverability

deliverability_audit

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)

domain

domain_age

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)

hash

hash_text

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)

json

json_tools

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)

jwt

jwt_decode

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)

regex

regex_test

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)

slugify

slugify

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)

uuid

uuid_batch

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)

weather

weather

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)

Endpoints

URL	Transport	State	Latency	Checked
https://sigtap-mcp.sigtap.workers.dev/mcp	streamable-http	answering	1876 ms	5 min ago

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sigtap Agent Tools — questions

Answers built from our own checks of this server.

What can sigtap Agent Tools do?

It exposes 13 tools, read directly from the server on our last check. Among them: catalog, crypto_price, deliverability_audit, domain_age, email_grade, email_template and 7 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is sigtap Agent Tools working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 93 of 93 checks got a reply (100.0%), average response time 643 ms. The bar chart above shows every period we have measured.

How do I connect sigtap Agent Tools?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does sigtap Agent Tools need an API key?

No. sigtap Agent Tools completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 13 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is sigtap Agent Tools?

It answers our handshake in 643 ms on average, which is faster than 22% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is sigtap Agent Tools open source?

Yes — it is published under the MIT licence, written in Python, 0 stars on GitHub and 1 open issue. The source link is on this page, so you can read exactly what it does with your data before you connect it.