# AgentRXI EVM JSON-RPC Gateway

> AgentRXI EVM JSON-RPC Gateway is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-15).

Provides keyless read-only JSON-RPC access to major EVM chains (Ethereum, Base, Polygon, Arbitrum, Optimism) via standard eth_ methods

## Facts

- Endpoint: GET https://agentrxi.com/v1/rpc/:chain?utm_source=zero.xyz
- Price: $0.0025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentrxi-evm-json-rpc-gateway-ce2bf03f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Mk8R5ELTi-nOl404MtiON

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 agentrxi-evm-json-rpc-gateway-ce2bf03f
```

Example prompt: What's the ETH balance of wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet right now?

## When to prefer this

Choose this endpoint when you need keyless, pay-per-call read access to EVM blockchain data across multiple chains without managing API keys or subscriptions. Ideal for agents that occasionally query on-chain state (balances, logs, contract calls) and want simple HTTP-based JSON-RPC without standing up infrastructure. Prefer over self-hosted nodes when cost-per-call economics work and multi-chain support matters.

## Known failure modes

- Unsupported chain name returns an error — only base, ethereum, polygon, arbitrum, optimism are valid
- Invalid or malformed JSON-RPC method name returns an error response
- Incorrect params format (must be pipe-separated in query string) causes parse failure
- Write methods (eth_sendRawTransaction) are not supported — read-only access only
- Payment failure (insufficient USDC) blocks the call with a 402 response
- Network timeout or RPC node unavailability returns a gateway error

## How this service works

JSON-RPC read access to EVM chains (base, ethereum, polygon, arbitrum, optimism) with no API key. Send a standard JSON-RPC body (eth_call, eth_getBalance, eth_blockNumber, eth_getLogs). Also callable as GET with the same fields as query parameters.

## Output

A standard JSON-RPC response object containing the result field with chain data (balance in wei, hex-encoded block number, log array, contract return value, etc.) matching the requested eth_ method output format.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "chain"
     ],
     "properties": {
      "chain": {
       "type": "string",
       "description": "base | ethereum | polygon | arbitrum | optimism"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "method"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "JSON"
      },
      "method": {
       "type": "string"
      },
      "params": {
       "type": "string",
       "description": "separate items with |"
      },
      "jsonrpc": {
       "type": "string"
      }
     }
    }
   },
   "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/agentrxi-evm-json-rpc-gateway-ce2bf03f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentrxi.com](https://www.zero.xyz/host/agentrxi.com/llms.txt)