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
Available components
Last scanned (4 hours ago)
Scores higher than 64% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Developer Tools
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. How we score → Why this is hard to score →
Endpoint Security46
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- 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. See how to fix → View diagnostics → Unverified
- HTTPS check failed: the endpoint is reachable over plaintext HTTP. See how to fix → View diagnostics → Fail
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability79
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 1267 tokens (~97/item across 13 items; 13 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 13 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 13 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 10 Oct 26 +1
- Stability: 0.97 → pass security
- 3 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 90 to 93. That category is still filling its 30-day observation window: 27 days of observed history at the previous scan, 28 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Sept 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 7 Sept 26 0
- 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 security
- Schema quality: 55 → 97 ▼ functional
- Tool “catalog” now declares an output schema ▲ functional
- Tool “crypto_price” now declares an output schema ▲ functional
- Tool “deliverability_audit” now declares an output schema ▲ functional
- Tool “domain_age” now declares an output schema ▲ functional
- Tool “email_grade” now declares an output schema ▲ functional
- Tool “email_template” now declares an output schema ▲ functional
- Tool “hash_text” now declares an output schema ▲ functional
- Tool “json_tools” now declares an output schema ▲ functional
- Tool “jwt_decode” now declares an output schema ▲ functional
- Tool “regex_test” now declares an output schema ▲ functional
- Tool “slugify” now declares an output schema ▲ functional
- Tool “uuid_batch” now declares an output schema ▲ functional
- Tool “weather” now declares an output schema ▲ functional
- First check of Tool coverage: 100 functional
- Schema quality: good → excellent functional
- 6 Sept 26 0
- Stability: unverified → 0.03 ▲ functional
- 5 Sept 26 0
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://sigtap-mcp.sigtap.workers.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=sigtap.workers.dev | CN=WE1,O=Google Trust Services,C=US | 3 Nov 2026 | 1 Feb 2027 | ECDSA 256 | ECDSA-SHA256 | 2192af197970e6890eb1c866ab8ee9ca |
| SANs: sigtap.workers.dev, *.sigtap.workers.dev | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of sigtap-mcp.sigtap.workers.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| workers.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://sigtap-mcp.sigtap.workers.dev/mcp | Verified | 200 | |
| http (plaintext) | http://sigtap-mcp.sigtap.workers.dev/mcp | Served over HTTP | 200 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
catalog ~26
List all 12 paid tools with live prices + free preview routes (FREE, no payment)
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| currency | string | yes | – |
| docs | string | yes | – |
| facilitator | string | – | – |
| free_previews_http | array | – | – |
| free_tools | array | yes | – |
| how_to_pay | string | – | – |
| network | string | yes | – |
| paid_tools | array | yes | – |
| server | string | yes | – |
| version | string | yes | – |
No examples provided.
crypto_price ~107
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)
| Name | Type | Req | Description |
|---|---|---|---|
| from | string | yes | Base asset code, e.g. BTC |
| to | string | yes | Quote asset code, e.g. USD |
| Name | Type | Req | Description |
|---|---|---|---|
| buy | number | yes | – |
| pair | string | yes | – |
| sell | number | yes | – |
| spot | number | yes | – |
| spread_pct | number | yes | – |
No examples provided.
deliverability_audit ~100
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)
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain to audit, e.g. openai.com |
| Name | Type | Req | Description |
|---|---|---|---|
| checks | object | yes | – |
| dkim | object | yes | – |
| dmarc | object | yes | – |
| domain | string | yes | – |
| spf | object | yes | – |
| verdict | string | yes | – |
No examples provided.
domain_age ~89
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)
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain to look up |
| Name | Type | Req | Description |
|---|---|---|---|
| age_days | number | yes | – |
| domain | string | yes | – |
| registrar | string | yes | – |
| registrar_url | string | – | – |
| registration_date | string | yes | – |
| verdict | string | yes | – |
No examples provided.
email_grade ~95
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)
| Name | Type | Req | Description |
|---|---|---|---|
| body | string | yes | Plain-text email body |
| subject | string | yes | Email subject line |
| Name | Type | Req | Description |
|---|---|---|---|
| checks | array | yes | – |
| grade | string | yes | – |
| score | number | yes | – |
No examples provided.
email_template ~111
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)
| Name | Type | Req | Description |
|---|---|---|---|
| company | string | – | Recipient company |
| name | string | – | Recipient name |
| offer | string | – | What you are offering |
| persona | string | – | founder | agency | freelancer |
| Name | Type | Req | Description |
|---|---|---|---|
| body | string | yes | – |
| cadence_tips | array | yes | – |
| persona | string | yes | – |
| subject | string | yes | – |
No examples provided.
hash_text ~103
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)
| Name | Type | Req | Description |
|---|---|---|---|
| text | string | yes | UTF-8 text to hash |
| Name | Type | Req | Description |
|---|---|---|---|
| base64 | string | yes | – |
| base64url | string | – | – |
| byte_length | number | – | – |
| crc32 | string | – | – |
| hex | string | yes | – |
| length | number | yes | – |
| sha256 | string | yes | – |
| sha384 | string | – | – |
| sha512 | string | – | – |
No examples provided.
json_tools ~97
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)
| Name | Type | Req | Description |
|---|---|---|---|
| data | string | yes | JSON string |
| mode | string | – | flatten | csv (default flatten) |
| Name | Type | Req | Description |
|---|---|---|---|
| flattened | object | yes | – |
| leaf_count | number | yes | – |
| mode | string | yes | – |
No examples provided.
jwt_decode ~93
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)
| Name | Type | Req | Description |
|---|---|---|---|
| token | string | yes | JWT to decode |
| Name | Type | Req | Description |
|---|---|---|---|
| alg | string | yes | – |
| flags | object | – | – |
| header | object | yes | – |
| payload | object | yes | – |
| signature | object | – | – |
No examples provided.
regex_test ~112
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)
| Name | Type | Req | Description |
|---|---|---|---|
| flags | string | – | Regex flags (subset of dgimsuy) |
| pattern | string | yes | Regular expression |
| text | string | yes | Text to search |
| Name | Type | Req | Description |
|---|---|---|---|
| backtracking_risk | object | – | – |
| count | number | yes | – |
| matches | array | yes | – |
| pattern | string | yes | – |
No examples provided.
slugify ~108
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)
| Name | Type | Req | Description |
|---|---|---|---|
| maxlength | integer | – | Max slug length 1-500 (default 60) |
| text | string | yes | Text to slugify |
| Name | Type | Req | Description |
|---|---|---|---|
| length | number | yes | – |
| maxlength | number | – | – |
| slug | string | yes | – |
| warnings | array | – | – |
No examples provided.
uuid_batch ~124
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)
| Name | Type | Req | Description |
|---|---|---|---|
| count | integer | – | How many IDs, 1-100 (default 1) |
| version | string | – | v4 | v7 | ulid | nanoid (default v4) |
| Name | Type | Req | Description |
|---|---|---|---|
| count | number | yes | – |
| ids | array | yes | – |
| version | string | yes | – |
No examples provided.
weather ~102
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)
| Name | Type | Req | Description |
|---|---|---|---|
| lat | number | yes | Latitude -90..90 |
| lon | number | yes | Longitude -180..180 |
| Name | Type | Req | Description |
|---|---|---|---|
| current | object | yes | – |
| next_3h | array | yes | – |
No examples provided.
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.
remote · sigtap-mcp.sigtap.workers.dev
claude mcp add --transport http unnamedaiagent-sigtap-agent-tools 'https://sigtap-mcp.sigtap.workers.dev/mcp'
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 75 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 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.