# Script Master Labs — Base RPC via x402

> Script Master Labs — Base RPC via x402 is a paid API for AI agents from mcp-x402.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Proxies Ethereum/Base JSON-RPC calls (e.g. eth_getBalance, eth_getBlockByHash) with per-call USDC micropayment settlement via the x402 protocol

## Facts

- Endpoint: GET https://mcp-x402.onrender.com/x402/base-rpc
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/script-master-labs-base-rpc-via-x402-b89fa370
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jT_0rkUmtb-StDhS_ixaJ

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 script-master-labs-base-rpc-via-x402-b89fa370
```

Example prompt: Can you look up the current ETH balance for wallet address 0xAbC...123 on the Base network using an eth_getBalance RPC call?

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call access to Base or Ethereum RPC data without managing your own node or committing to a subscription API key. Ideal for AI agents that make infrequent or burst RPC calls and want to settle costs in USDC micropayments via x402. Prefer alternatives (Alchemy, Infura free tiers) when call volume is high enough to make per-call pricing uneconomical.

## Known failure modes

- Invalid or unsupported RPC method returns an error object
- Missing required 'method' field causes a 400-level rejection
- Block hash or address not found returns null result
- Payment failure or insufficient USDC balance blocks the response
- Network congestion on Base may cause timeouts
- Malformed address or hash causes RPC-level error

## How this service works

Pay-per-call crypto, RWA, federal, SEC, Section 8/HUD housing, and compliance APIs via x402. Primary: USDC on Base (eip155:8453). Also accepts Global Dollar (USDG) on Robinhood Chain (eip155:4663) via sovereign X-PAYMENT-TX. Hyphen routes only (e.g. /x402/gas-tracker, /x402/pha-lookup, /x402/sec-8k). MARKETPLACE REVIEW: use free /x402/playground/* (no key, no payment). Production /x402/* returns 402 unless paid via x402 or X-Api-Market-Key / X-API-Key from seller dashboard.

## Output

Returns a JSON-RPC response payload from the Base/Ethereum node, including fields such as block data, account balance in wei, transaction receipts, or contract bytecode, depending on the method called. Payment of $0.001 USDC is settled atomically via x402 before the response is delivered.

## 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": {
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "hash": {
       "type": "string"
      },
      "block": {
       "type": "string"
      },
      "method": {
       "type": "string"
      },
      "address": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "properties": {
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/script-master-labs-base-rpc-via-x402-b89fa370/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-x402.onrender.com](https://www.zero.xyz/host/mcp-x402.onrender.com/llms.txt)