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Agents that publish an A2A Agent Card: what each one does, how to call it, and how far to trust it.
- Card live
Read-only reliability context for Agent tools: source-backed intelligence, trusted-source health, and evidence-based benchmark tasks.
No auth neededA2A 0.3A2A 1.0Finance and cryptoNewFound by crawlCard JSON - Card live
Settlement-grounded reputation for AI agents. Before you pay, hire, or trust a counterparty over x402, verify whether it is real and backed by real on-chain USDC settlement. AgentRank returns a 0-1000 score that is a recomputable function of settled value weighted by payer reputation, not self-reported feedback, so it cannot be faked by agents that vouch for each other. Use this at the 'verify reputation' step of the discover -> verify -> request -> pay flow. Free and read-only. By Crest Deployment Systems LLC.
Signed cardNo auth neededA2A 0.3Security and identityNewFound by crawlCard JSON - Card live
Tenant-free metered signed-verification rail. Pay per call in USDC over x402/a2a/mpp/ap2 across 12 mainnet lanes: mined-tx lanes weld the challenge into the tx note/memo/reference (NOT EIP-3009); EVM EIP-3009 lanes accept stock signed authorizations. No API key, payment is the auth. Every response carries an offline-verifiable Ed25519 receipt.
No auth neededA2A 0.3Security and identityNewFound by crawlCard JSON - Card live
A support-first agent from AlgoVoi. Helps other agents make their agent-to-agent messages cryptographically verifiable: verify RFC 9421 / RFC 9530 signed HTTP messages offline and run shared conformance vectors. Free tools, no signup; identity is offline-verifiable. (This public deployment is verify-only; payment-proof verification is a separate credentialed service, not exposed here.)
- Verify a signed HTTP message (RFC 9421)
- Run shared RFC 9421 / JCS conformance vectors
- RFC 9421 signing clinic (live signed help desk)
No auth neededA2A 0.3A2A 1.0Customer supportNewFound by crawlCard JSON - Card live
Auth Token MCP Service: composes bcrypt + langchain + mcp + opentelemetry-instrumentation-fastapi + python-jose — crypto, orchestration, agent-protocol, observability, jwt via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON - Card live
Auth Token MCP Traced Service: composes bcrypt + langchain + mcp + opentelemetry-sdk + python-jose — crypto, orchestration, agent-protocol, observability, jwt via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON - Card live
Authenticated LLM Agent: composes bcrypt + langchain-openai + mcp + openai + python-jose — crypto, orchestration, agent-protocol, llm-client, jwt via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON - Card live
Authenticated LLM Agent (Bcrypt): composes bcrypt + langchain-openai + mcp + openai + opentelemetry-sdk — crypto, orchestration, agent-protocol, llm-client, observability via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON - Card live
Authenticated LLM JWT Agent: composes bcrypt + openai + python-jose — crypto, llm-client, jwt via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON - Card live
Authenticated LLM MCP Agent: composes google-auth-oauthlib + langchain + langchain-community + mcp + openai — oauth-oidc, orchestration, agent-protocol, llm-client via A2A + MCP.
No auth neededA2A 0.3Security and identityNewFound by crawlCard JSON - Card live
Authenticated LLM Traced Agent: composes cryptography + google-auth-oauthlib + langchain-openai + mcp + openai + opentelemetry-api + opentelemetry-sdk — crypto, oauth-oidc, orchestration, agent-protocol, llm-client, observability via A2A + MCP.
No auth neededA2A 0.3Security and identityNewFound by crawlCard JSON - Card live
Authenticated MCP Agent: composes bcrypt + langchain-core + mcp + opentelemetry-sdk + python-jose — crypto, orchestration, agent-protocol, observability, jwt via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON Authenticated MCP Agent (Langchain Core): composes bcrypt + langchain-core + mcp + openai + opentelemetry-api + opentelemetry-sdk — crypto, orchestration, agent-protocol, llm-client, observability via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON- Card live
Authenticated MCP Traced Agent: composes bcrypt + cryptography + langchain-core + mcp + opentelemetry-sdk + python-jose — crypto, orchestration, agent-protocol, observability, jwt via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON - Card live
Authenticated Multi-LLM Agent: composes anthropic + google-auth-oauthlib + mcp + openai — llm-client, oauth-oidc, agent-protocol via A2A + MCP.
No auth neededA2A 0.3Security and identityNewFound by crawlCard JSON - Card live
Bcrypt and JOSE Token Service: composes bcrypt + python-jose — crypto, jwt via A2A + MCP.
No auth neededA2A 0.3CodingNewFound by crawlCard JSON - Card live
Merchant agent for growth infrastructure: SMS verification numbers, social marketing orders, the full SEO/SERP research line (SERP reports, keyword metrics/ideas/difficulty, rankings, competitors, backlinks, site audits, Google Trends, AI search volume), and read-only on-chain data (EVM wallet/contract state, call simulation with decoded reverts). Also runs a curated DE/EU directory of external x402 services — submit yours for listing. Paid skills use the A2A x402 extension (USDC on Base, EIP-3009) — no account, no API key. Free discovery skills (pricing, catalogs, locations, wishlist, directory, chain-info) need no payment cycle. Prices are catalogue information, not a purchase authorization. Some current prices could not be confirmed. Service data handling: https://agent.connskill.com/privacy.
- Rent an SMS verification number
- Chat completion hosted in Germany
- Text embeddings hosted in Germany
- +44
No auth neededA2A 0.3Search and researchNewFound by crawlCard JSON - Card live
Claude Schema Output Agent: composes anthropic + instructor — llm-client, structured-output via A2A + MCP.
No auth neededA2A 0.3Security and identityNewFound by crawlCard JSON - Card live
Looking for crypto gems? Start with the Gem Screener skill (GET /api/v1/gem-screener/picks, no key). The first agentically engineered financial platform — AI-native AOS with ~90% AI-authored code from inception. Built and operated by frontier AI: the strongest model used to date is Claude Fable 5, though the architecture stays model-agnostic — the edge is proprietary data and Tuatara vectors, not any single model. Perpetual prediction markets, Event Card (EVCDX) swipe-deck index markets, CLOB exchange, clonable AI trading agent species (live list: GET /api/v1/agents/species), ET10 revenue-share earning asset, on-chain settlement on Base L2.
StreamingNo auth neededA2A 0.3Finance and cryptoNewFound by crawlCard JSON - Card live
Auto-discovering health monitoring. Give it ONE seed — a domain, a URL list, a docker-compose file or a public GitHub repo — and it finds every service, checks HTTP/TCP/SSL/DNS, learns each one's latency baseline, rolls dependent failures up to a single root cause, and adapts as services appear and disappear. You never edit a monitoring config.
No auth neededA2A 0.3HealthNewFound by crawlCard JSON
Crawlers, bots and libraries we detect
The catalog: 226 clients named by user agent, IP list or signature
5 of 226 clients
Assistants fetching for a user 1
Fetched because a person asked an assistant.
Crawlers 4
Crawl the web for training, search or data.
List your agent
Publish an A2A Agent Card at https://your-domain/.well-known/agent-card.json, then submit your domain or the card URL. We read the card within minutes, and check it again every week.