Echovalidum catalog agent bronze

echovalidum.pages.dev

“Echovalidum's catalog, as an A2A agent: read-only and deterministic (it runs no language model). Say what you're after, and crate echovalidum, as published to crates.io and compiled to WebAssembly, shows every .sol build kit, section of the site and part of the shop it connects your words to, and through which concepts. It also answers a kit's claims, price and license, how prices, membership, taxes and refunds work, or a citation of one of the site's pages that the site signs. It keeps no tasks (every message is answered at once), and buys and changes nothing: a person buys on www.echovalidum.com, where checkout is open in the United States, through Stripe. Every answer is signed (RFC 9421, ML-DSA-65) with the key at /.well-known/http-message-signatures-directory.

https://echovalidum.pages.dev/.well-known/agent-card.json its card

Checked 6d ago extendedAgentCard, 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 4 Feb 2027 as of our check on 8 Nov 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.

Key ECDSA P-256, signed ECDSA-SHA384, issued via YE2 under ISRG Root X2 — classical, as every publicly trusted certificate is today.

Names on this certificate (2)

*.echovalidum.pages.dev, echovalidum.pages.dev.
Connection: TLS 1.3 · X25519MLKEM768 — post-quantum hybrid key exchange, agreed with our checker on 8 Nov 2026. What this means
DANE / TLSA: Not verified
Discovery: Well-known document
This host also publishes an ARD catalog (/.well-known/ai-catalog.json) declaring 5 resources. The catalog's entries are the publisher's claims, not something agenttru.st verified.
AI use policy: Search: yesAI input: yesAI training: no

What this site's robots.txt says about how AI may use its content. Recorded as the operator wrote it, not enforced — these are preferences about use, not access, and agenttru.st only reads the agent's own discovery documents.
AI-facing documents: Publishes /llms.txt — “Echovalidum” a curated map of the site's content for language models

Publishes a Web Bot Auth key directory (4 keys, ML-DSA-44, ML-DSA-65, ML-DSA-87) — the operator publishes keys so their agent's signed requests can be verified. agenttru.st recorded that the directory exists; it has not verified a signature.

Fetched from this host during verification. Neither document is how this agent was discovered.
First seen: 8 Nov 2026

View verification details

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: ? Unknown · Cloudflare, Inc. (AS13335)
The address did not geolocate — usually anycast hosting, where one address answers from many places at once.
Last checked: 6d 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 echovalidum.pages.dev controls every word below.

Ask the crate: every connection

Say what you're after, in your own words. Crate echovalidum 0.4.0, as published to crates.io and compiled to WebAssembly (the same bytes a guest's card runs), connects them to every .sol build kit, section of the site and part of the shop that shares a concept with them, and answers all of it in ways, each thing saying why: the kits your words name, what connects through which concepts, and kits that only hold your words. As text, and as JSON in a data part. A data part {"skill": "ask-the-crate", "words", "concepts", "from", "kinds", "limit"} asks the same; from is any key in an answer, for what connects to that one thing.

crateconnectionssearchkitsconcepts

Examples it gives

kits for persistent memory
a kit that scores fraud
navigation engine kits
post-quantum agents

List the build kits

Ask to list the kits ("list the navigation kits"), and the agent answers the .sol build kits whose name, title, summary or claims hold those words, the most matching first, each with its tier, price in US dollars and links. A data part {"skill": "find-kits", "query", "tier", "limit"} asks the same.

cataloglistkits

Examples it gives

list the navigation kits
list all the kits

Describe a kit

Name a kit (such as fraud_score) and the agent answers it in full from its signed manifest: what it does, the claims its own run decides, its price and member price, its files and runtime, its license, where to buy it, and what the crate connects to it. A kit whose name is a plain word (imports, persistent, ouroboros) is described when named alone or as <name>.sol; among other words, the crate shows it with what else they connect to. A data part {"skill": "describe-kit", "name"} asks the same.

catalogkitmanifestclaims

Examples it gives

fraud_score
what does soc_triage prove

Prices, license and buying

Ask about prices, the membership, the license, taxes or refunds, and the agent answers from the signed listing, with the pages that say each. A person buys on the site; the agent buys nothing.

priceslicenserefundscheckout

Examples it gives

how much is a kit
what license do the kits carry
can I get a refund

Cite a page, word for word

Send "cite <page>: <words>" (or a data part {"skill": "cite", "page", "quote", "section"}) and the agent answers a citation the site signs (Echovalidum Citations 1.0): the passage, where the quote sits, the page's Markdown SHA-256, and the address that gives the same citation signed in its headers. Pages: index, lab, discoveries, one-cell, tour, judgments, api, verification, about, client-module, announcements, privacy, terms, catalog, pricing, validumbytes, terms-of-sale, refunds.

citationquoteverification

Examples it gives

cite privacy: the site sets no cookies of its own
cite catalog: A kit is a start, not a finished product
cite refunds: Before you download

What its catalog declares

From the ARD catalog this host publishes at /.well-known/ai-catalog.json. The operator controls every entry; agenttru.st verified that the catalog exists and parses, and nothing about what the entries say.

Echovalidum catalog (MCP server)

mcp-server-card

https://www.echovalidum.com/.well-known/mcp/server-card.json

Echovalidum catalog agent (A2A)

a2a

https://www.echovalidum.com/.well-known/agent-card.json

Echovalidum public APIs (OpenAPI)

vnd.oai.openapi

https://www.echovalidum.com/openapi.json

Echovalidum API catalog (RFC 9727)

linkset

https://www.echovalidum.com/.well-known/api-catalog

Echovalidum agent skills

json

https://www.echovalidum.com/.well-known/agent-skills/index.json

Technical agent card

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

Provider: Echovalidum (Brisen Koch) — 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

View all card details

Capabilities: extendedAgentCard pushNotifications streaming
Agent card: https://echovalidum.pages.dev/.well-known/agent-card.json

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