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SYNTHORA RPC Nonce Lookup
x402
SYNTHORA RPC Nonce Lookup is a paid API for AI agents from rpc-nonce.hergertsynthora.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Returns the next pending transaction nonce for an Ethereum address using eth_getTransactionCount (pending)
Price / call$0.1
Success—
StatusUnknown
How this service works
Next pending nonce for an address via eth_getTransactionCount (pending). Deterministic, Ed25519-signed.
Output
Returns the pending nonce (transaction count) for the given address, cryptographically signed with Ed25519 for integrity, indicating the next sequence number to use for a new transaction on that chain.
Example use cases
Example prompt
“What's the next pending nonce for Ethereum address 0xAbCd1234... on Base so I can construct my next transaction?”
Technical details
Endpoint
POSThttps://rpc-nonce.hergertsynthora.com/serviceWhen to prefer
Use this endpoint when you need to programmatically retrieve the pending nonce for an Ethereum-compatible address before constructing or signing a transaction, especially when you want Ed25519-signed deterministic responses for auditability, and when operating on chains supported by SYNTHORA's RPC infrastructure. The first 3 calls per wallet are free, making it useful for low-frequency or testing scenarios before committing USDC via x402.
Side effects
- Invalid or malformed Ethereum address returns an error with no charge
- Upstream RPC node failure returns an error with no charge billed
- Unsupported or invalid chain identifier results in an error response
- Missing required fields (address or chain) causes a request validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | chain |
| addressrequired | string | address |
Tags
x402
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