# ChainRay Agent Discovery Registry

> ChainRay Agent Discovery Registry is a paid API for AI agents from chainray.online, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Discovers and lists registered AI agents in the ChainRay on-chain agent registry, filtered by blockchain network, with verifiable on-chain proofs

## Facts

- Endpoint: GET https://chainray.online/agent-card/discover
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainray-agent-discovery-registry-7a4943f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ujoSJkY5P45dXu3krr-R5

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 chainray-agent-discovery-registry-7a4943f9
```

Example prompt: Can you show me which AI agents are currently registered on Ethereum in the ChainRay registry, along with the on-chain proof?

## When to prefer this

Use this endpoint when you need to discover AI agents registered on a specific blockchain network with cryptographic, on-chain verifiability. Prefer this over generic agent directories when you require tamper-evident proof of registry state tied to a specific block, or when operating in a multi-chain context and need to enumerate agents by chain.

## Known failure modes

- Invalid or unsupported chain name returns empty results or error
- Registry may be empty (registrySize: 0, returned: 0) if no agents are registered
- Network timeout or upstream RPC failure may cause delayed or failed proof generation
- Payment not received (x402 protocol failure) results in 402 response before data is served

## How this service works

The most complete blockchain data and intelligence service for AI agents. 93 endpoints across 46 chains, from gas fees to DeFi analytics, with real-time streams, intent routing, and verifiable proofs. Pay-per-request via x402.

## Output

Returns an array of registered AI agents matching the filter, the total registry size, how many matched, applied filters (chain, keyword, capability), a timestamp, and a cryptographic on-chain proof object containing block number, block hash, data hash, chain name, and proof version for verifiability.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "chain": "ethereum"
  }
 }
}
```

## 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": {
      "chain": {
       "type": "string",
       "description": "Blockchain network (e.g., base, ethereum, polygon)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainray-agent-discovery-registry-7a4943f9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chainray.online](https://www.zero.xyz/host/chainray.online/llms.txt)