sigtap Agent Tools
https://sigtap-mcp.sigtap.workers.dev/mcp ↗
Description
13 paid x402 tools, USDC/Base. Free check: GET /preview<path>=200 sample. Copy-paste pay: /llms.txt
What our measurements say
sigtap Agent Tools is a remote MCP server published at sigtap-mcp.sigtap.workers.dev. It has been probed 8 times since 9/12/2026. It answered in 8 of them (100.0%), a near-uninterrupted record. Median response time is 562 ms, a delay an agent will notice. It offers a narrow, focused set of 13 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Agent readability score
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| Run | Era | Modern | ms | Legacy | ms | Versions |
|---|---|---|---|---|---|---|
| 2026-09-13 06:40:42 | Legacy | 400 | 496 | 200 | 627 | 2025-11-25 |
| 2026-09-13 04:35:29 | Legacy | 400 | 626 | 200 | 565 | 2025-11-25 |
| 2026-09-13 01:33:33 | Legacy | 400 | 562 | 200 | 561 | 2025-11-25 |
| 2026-09-12 23:31:36 | Legacy | 400 | 491 | 200 | 496 | 2025-11-25 |
| 2026-09-12 21:29:15 | Legacy | 400 | 621 | 200 | 649 | 2025-11-25 |
| 2026-09-12 19:27:29 | Legacy | 400 | 605 | 200 | 576 | 2025-11-25 |
| 2026-09-12 17:24:09 | Legacy | 400 | 524 | 200 | 549 | 2025-11-25 |
| 2026-09-12 15:21:42 | Legacy | 400 | 549 | 200 | 552 | 2025-11-25 |
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 37ms → warm 38ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
catalogList all 12 paid tools with live prices + free preview routes (FREE, no payment)
deliverability_auditSPF/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)
domainstringrequired
email_grade12-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)
subjectstringrequiredbodystringrequired
email_templatePersonalized 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)
personastringofferstringnamestringcompanystring
hash_textSHA-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)
textstringrequired
jwt_decodeDecode 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)
tokenstringrequired
uuid_batchBatch 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)
countintegerversionstring
slugifyUnicode-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)
textstringrequiredmaxlengthinteger
json_toolsFlatten 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)
datastringrequiredmodestring
regex_testRegex 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)
patternstringrequiredtextstringrequiredflagsstring
crypto_priceCoinbase 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)
fromstringrequiredtostringrequired
domain_ageDomain 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)
domainstringrequired
Availability history
Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.
Era history
Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.
Response time history
The two probe legs separately: modern server/discover and legacy initialize.
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Legacy
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[](https://mcpmetrics.io/servers/io-github-unnamedaiagent-sigtap-agent-tools)<a href="https://mcpmetrics.io/servers/io-github-unnamedaiagent-sigtap-agent-tools"><img src="https://mcpmetrics.io/badge/io.github.unnamedaiagent/sigtap-agent-tools/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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