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Agent Card Fetch
x402
Agent Card Fetch is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Fetches and summarises AI agent discovery metadata from a domain by probing well-known agent descriptor paths
Price / call$0.05
Success—
StatusUnknown
How this service works
Agent discovery card fetch: looks for /.well-known/agent.json and /.well-known/agent-card.json (Google A2A Agent Card) plus /llms.txt and /.well-known/ai-plugin.json, and summarises whatever is found: name, description, url, version, capabilities (streaming, push), skills (id, name, description, tags), auth schemes, input/output modes, and provider. Lets agents learn what another agent offers. $0.01 per domain.
Output
A structured summary of whatever agent discovery documents are found at the domain, including: agent name, description, URL, version, capabilities (streaming, push notifications), skills list (each with id, name, description, and tags), supported authentication schemes, accepted input/output modes, and provider identity. Fields not present in any discovered document are omitted.
Example use cases
Vetting an agent before integration
“Before I integrate with the agent at payments.example.com, can you fetch its agent card and tell me what skills it advertises, what auth it requires, and whether it supports streaming?”
Building an agent directory
“I'm compiling a directory of AI agents — can you pull the agent card for shopbot.io and give me its name, description, version, and the list of skills with their tags?”
Checking A2A compatibility
“I want to know if the service at assistant.brandx.com follows the Google A2A standard — fetch its well-known agent card and tell me what capabilities and input/output modes it declares.”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/dev/agent-cardWhen to prefer
Choose this endpoint when an AI agent needs to programmatically discover what another agent or AI-enabled service offers before calling it — especially for A2A (agent-to-agent) workflows, building agent registries, or checking interoperability. Prefer this over manually inspecting URLs when you need a single call that probes all standard discovery paths (agent.json, agent-card.json, llms.txt, ai-plugin.json) and returns a normalised summary.
Side effects
- Domain does not publish any well-known agent descriptor — returns empty or not-found summary
- Domain is unreachable or times out — network error response
- Domain returns malformed JSON at well-known paths — parse error noted in response
- Domain has no agent card but publishes llms.txt or ai-plugin.json only — partial results returned
- Rate limiting or firewall on target domain blocks probe requests
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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