# Alchemy Blockchain RPC (x402 Pay-Per-Call)

> Alchemy Blockchain RPC (x402 Pay-Per-Call) is a paid API for AI agents from x402.alchemy.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-10).

Provides paid JSON-RPC access to blockchain nodes across supported chain networks via Alchemy, billed at $0.001 USDC per call using the x402 payment protocol.

## Facts

- Endpoint: POST https://x402.alchemy.com/%7BchainNetwork%7D/v2
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-alchemy-com-ef287eda
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rcz0Pr7aCpHON_aeY1_Kp

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 x402-alchemy-com-ef287eda -d '<json body>'
```

Example prompt: Using Alchemy's RPC on Ethereum mainnet, call eth_getBalance for wallet address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 and return the balance in wei.

## When to prefer this

Choose this endpoint when you need direct, authenticated blockchain RPC access across multiple EVM-compatible chains without managing your own node, and you want pay-per-call pricing via x402 rather than a subscription API key. Ideal for agents that need real-time on-chain data, transaction broadcasting, or contract interaction with minimal setup.

## Known failure modes

- Invalid or unsupported chainNetwork path returns 404 or routing error
- Malformed JSON-RPC body returns parse error (-32700)
- Unsupported RPC method returns method-not-found error (-32601)
- Payment failure or insufficient USDC balance causes x402 payment rejection
- Rate limiting or node unavailability causes 503 or timeout
- Invalid parameters for the RPC method return invalid-params error (-32602)

## How this service works

Paid blockchain RPC access across supported chain networks via Alchemy.

## Output

A standard JSON-RPC response object from the Alchemy node, containing a 'result' field with the requested on-chain data (e.g. balance, block info, transaction receipt, contract return value) or an 'error' field with code and message if the call failed.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-alchemy-com-ef287eda/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.alchemy.com](https://www.zero.xyz/host/x402.alchemy.com/llms.txt)