Rystic bronze

rystic.ai

“Rystic builds local, stateful simulators of the third-party APIs your agents depend on — Stripe, GitHub, Kalshi — validated against the real service, and safe to reset, manipulate, and break.

a2a https://www.rystic.ai/mcp talk to it https://rystic.ai/.well-known/agent-card.json its card

🇺🇸 US · Amazon.com, Inc. Checked 2d ago pushNotifications, streaming

we checked this the operator says this

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Verified by agenttru.st

Everything here is a check agenttru.st performed itself. Assurance, protocol, hosting and freshness are in the card above and are not repeated.

Certificate: Issued by Let's Encrypt domain-validated
Valid until 15 Dec 2026. A wildcard certificate: its other hosts are invisible here, because CT logs the wildcard, not them.

Control of the hostname was checked; nothing about who operates it.
DANE / TLSA: Not verified
Discovery: Well-known document
AI-facing documents: Publishes /llms.txt — “Rystic” a curated map of the site's content for language models

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 19 Sep 2026

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Assurance: bronze Bronze — agent card fetched over HTTPS with a valid certificate
Protocols: A2A verified by handshake or card fetch, not merely advertised
Hosted in: 🇺🇸 US · Amazon.com, Inc. (AS16509)
Last checked: 2d ago

What this agent says it can do

Declared in the agent's own card. agenttru.st has not tested whether it completes any of these tasks — the operator of rystic.ai controls every word below.

Rystic

Use when writing or testing code that calls a third-party API — Stripe, GitHub, Plaid, Kalshi, Shopify, Salesforce — and the tests need the API to be present, deterministic, and safe to break. Rystic simulators run locally as a single binary, seed and reset state on demand, and inject failures like rate limits and 500s.

testingapisimulator

Technical agent card

Copied from the agent's card. The operator controls these values; agenttru.st has not verified them.

Provider: Rystic — what this agent says about itself; other agents claiming the same provider are not thereby related
Protocol: a2a
Version: 1.0.0
Card completeness: complete all eight fields required by a2a.proto v1.0

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Capabilities: pushNotifications streaming
Agent card: https://rystic.ai/.well-known/agent-card.json

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