Base storage slot read

$0.01 per call · failed calls are never charged · no account or API key needed

Read one raw storage slot of a contract on Base (eth_getStorageAt): the 32-byte word, as a number and, when it holds one, as an address. Slot is a decimal index or a 0x 32-byte key (mapping and proxy slots). Use to inspect contract state that has no getter, owners or implementation pointers; for proxies use base_proxy. A malformed address or slot is rejected with 400, uncharged.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Try it with your own inputs

0x contract address

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
address (required)string0x contract address
slotstringSlot: a decimal index (0, 1, 2…) or a 0x 32-byte key

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/base/storage?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/base/storage?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "chain": "Base",
  "chainId": 8453,
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "slot": "0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3",
  "value": "0x0000000000000000000000002ce6311ddae708829bc0784c967b7d77d19fd779",
  "asNumber": "251560…",
  "asAddress": "0x2ce6311ddae708829bc0784c967b7d77d19fd779",
  "block": 123456789
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is base_storage, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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