# Agent Card Fetch

> 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

## Facts

- Endpoint: GET https://intel.rallylive.ca/dev/agent-card
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-card-fetch-63e77e20
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YzteRxsU1liSJiMi1nWrv

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agent-card-fetch-63e77e20
```

Example prompt: What capabilities does the agent at acme.ai offer? Check its agent card and tell me its skills, supported auth schemes, and whether it supports streaming.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-card-fetch-63e77e20/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)