# BlockRun.AI Polygon JSON-RPC Gateway

> BlockRun.AI Polygon JSON-RPC Gateway is a paid API for AI agents from blockrun.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).

Proxies standard Ethereum/EVM JSON-RPC calls to the Polygon network via Tatum's gateway, billed per-call in USDC with no API key required.

## Facts

- Endpoint: POST https://blockrun.ai/api/v1/rpc/polygon?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockrun-ai-polygon-json-rpc-gateway-08276ef0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uhJAv6eX8_W4tFWyKX3sm

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 blockrun-ai-polygon-json-rpc-gateway-08276ef0 -d '<json body>'
```

Example prompt: Can you check the current block number on Polygon using a JSON-RPC call — use the eth_blockNumber method with no params?

## When to prefer this

Choose this endpoint when you need keyless, pay-per-call access to the Polygon EVM JSON-RPC without provisioning an API key or committing to a subscription. It is ideal for agents that need occasional or burst Polygon blockchain queries billed in USDC via x402 protocol, especially when a multi-chain gateway (Tatum) reliability is desired behind the scenes.

## Known failure modes

- Invalid JSON-RPC method name returns error code -32601 Method not found
- Malformed params array returns error -32602 Invalid params
- Insufficient USDC balance causes payment failure and request rejection
- Network congestion may cause timeout or slow response
- Unsupported Polygon-specific methods may return errors from the underlying Tatum gateway

## How this service works

Multi-chain JSON-RPC passthrough fronted by BlockRun, powered by Tatum's gateway across 40 chains (Ethereum, Base, Solana, Polygon, BSC, Arbitrum, Optimism, Avalanche, Bitcoin, Sui, and more). One endpoint, every chain, pay-per-call in USDC, no API key. $0.002 per call (or per element of a JSON-RPC batch). Network: Polygon.

## Output

A standard JSON-RPC 2.0 response object containing the result field with the requested on-chain data (block number, balance, call return value, etc.) or an error object with code and message if the call failed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "id": {
   "type": [
    "string",
    "number"
   ],
   "description": "JSON-RPC id"
  },
  "method": {
   "type": "string",
   "description": "Chain RPC method, e.g. eth_blockNumber, eth_call, eth_getBalance (EVM) or getSlot, getAccountInfo (Solana)."
  },
  "params": {
   "type": "array",
   "description": "Method-specific params."
  },
  "jsonrpc": {
   "type": "string",
   "description": "\"2.0\""
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockrun-ai-polygon-json-rpc-gateway-08276ef0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from blockrun.ai](https://www.zero.xyz/host/blockrun.ai/llms.txt)