# Bot Bazaar A2A Agent Card Linter

> Bot Bazaar A2A Agent Card Linter is a paid API for AI agents from bot-bazaar.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Validates an A2A /.well-known/agent-card.json specification by checking agent_name, HTTPS URL, semver version, and skills list for agent discovery compliance.

## Facts

- Endpoint: GET https://bot-bazaar.fly.dev/v1/x402/agent-card-lint?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bot-bazaar-a2a-agent-card-linter-d0162eb4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jNUihBXKsW5XaA9IcnRfS

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 bot-bazaar-a2a-agent-card-linter-d0162eb4
```

Example prompt: Can you lint my A2A agent card for an agent named 'my-research-bot' and tell me if the agent_name, HTTPS URL, semver version, and skills list are all valid for agent discovery?

## When to prefer this

Use this endpoint when building or deploying A2A-compatible AI agents and need to verify that your agent-card.json meets the discovery specification before publishing. Ideal for CI/CD pipelines, pre-deployment checks, or debugging why an agent isn't being discovered correctly. Prefer this over manual review when you need programmatic, structured validation feedback on A2A agent card compliance.

## Known failure modes

- Missing agent_name query parameter returns an error indicating required field absent
- Invalid or non-HTTPS URL in agent card triggers URL validation failure
- Malformed semver version string flagged as non-compliant
- Empty or malformed skills list returns skills validation error
- Agent card URL unreachable or returns non-200 status may cause fetch failure
- Payment not processed (x402 flow incomplete) returns 402 Payment Required

## How this service works

Validate an A2A /.well-known/agent-card.json specification (agent_name, https url, semver version, skills list) for agent discovery.

## Output

Returns a lint/validation report indicating whether the agent card passes A2A spec requirements, including checks on agent_name format, HTTPS URL validity, semver version correctness, and skills list structure, along with any specific errors or warnings found.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "agent_name": {
       "type": "string",
       "description": "Agent name declared in agent-card.json"
      }
     }
    }
   },
   "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/bot-bazaar-a2a-agent-card-linter-d0162eb4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bot-bazaar.fly.dev](https://www.zero.xyz/host/bot-bazaar.fly.dev/llms.txt)