# Vextorium Multi-Chain JSON-RPC Proxy

> Vextorium Multi-Chain JSON-RPC Proxy is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-14).

Executes a read-only JSON-RPC method on any of 14 supported blockchains (12 EVM chains, Solana, XRPL) and returns the raw node result, paid per call at $0.002 USDC.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/rpc?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-multi-chain-json-rpc-proxy-aa315bbf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_djeo2zxQ-MDNLA5wCW0-6

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 vextorium-multi-chain-json-rpc-proxy-aa315bbf -d '<json body>'
```

Example prompt: What's the current ETH balance of wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet — call eth_getBalance with 'latest' as the block parameter.

## When to prefer this

Choose this endpoint when you need raw, low-level JSON-RPC access to any of 14 supported chains without setting up your own RPC node or managing API keys. It is ideal for agents that need to make one-off or infrequent on-chain reads across multiple chains without provisioning per-chain infrastructure. At $0.002/call it suits low-to-moderate query volumes where pay-per-call is preferred over subscription RPC services.

## Known failure modes

- Unsupported chain identifier returns an error
- Write methods (eth_sendRawTransaction, etc.) are rejected as read-only endpoint
- Malformed params array causes node-level RPC error
- Node timeout or temporary unavailability returns latency spike or error
- Payment failure (insufficient USDC) blocks the call via x402 protocol

## How this service works

552 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.

## Output

A JSON object containing the chain queried, the RPC method called, the raw result from the node (e.g. a hex block number, balance, or structured object), the source node URL, and the round-trip latency in milliseconds.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "enum": [
    "ethereum",
    "base",
    "arbitrum",
    "optimism",
    "polygon",
    "bnb",
    "avalanche",
    "gnosis",
    "line",
    "scroll",
    "sonic",
    "unichain",
    "solana",
    "xrpl"
   ],
   "type": "string"
  },
  "method": {
   "type": "string",
   "description": "JSON-RPC method (read-only), e.g. eth_getBalance, getSlot, account_info"
  },
  "params": {
   "type": "array",
   "description": "Method params (for XRPL, one object)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "method": "eth_blockNumber",
  "result": "0x3214aa0",
  "source": "Public node (base-rpc.publicnode.com)",
  "latency_ms": 100
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-multi-chain-json-rpc-proxy-aa315bbf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)