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Merkle-Patricia State Proof for EVM Account and Storage Slot
x402
Merkle-Patricia State Proof for EVM Account and Storage Slot is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-29).
Returns a cryptographic Merkle-Patricia trie proof for an EVM account's state and an optional storage slot on supported EVM chains
Price / call$0.006
Success—
StatusUnknown
How this service works
Merkle-Patricia state proof for an account and optional storage slot — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok=true, a type of 'evm-proof', the Merkle-Patricia proof data for the requested account and optional storage slot, and a payment receipt containing the transaction hash, USD amount charged, and a unique receipt ID.
Example use cases
Cross-chain bridge state verification
“I need a Merkle state proof for address 0xDeadBeef...1234 on Arbitrum at block 'latest' — I want to verify the account balance on-chain for a bridge relay.”
Smart contract storage proof for governance
“Can you get me a Merkle-Patricia proof for storage slot 0x0000000000000000000000000000000000000000000000000000000000000002 on the Base contract at 0xAaBb...9900? I need it to prove a governance token balance for a snapshot.”
Historical account state audit
“Pull a state proof for the Ethereum address 0x1111...2222 at block number 19000000 — I need cryptographic proof of what the account's nonce and balance were at that point.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/evm-proof?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cryptographically verifiable Merkle-Patricia trie proof of an EVM account's state or contract storage value — for example, to feed into on-chain bridge verification, light client validation, or trustless cross-chain attestation. Prefer this over reading RPC data directly when the consumer requires proof of inclusion rather than just a value, or when you need to prove a historical state at a specific block number.
Side effects
- Invalid address format (not 0x-prefixed 40-char hex) returns validation error
- Unsupported chain name returns enum validation error
- Nonexistent or pruned block returns proof unavailable error
- Invalid storage slot hex format causes parameter rejection
- Payment failure or insufficient USDC balance returns 402
- Node unavailability on the target chain causes timeout or 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "evm-proof",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.25,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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