Struct QuoteGenerator 

pub struct QuoteGenerator { /* private fields */ }

Quote generator for creating payment quotes.

Uses the node’s signing capabilities to sign quotes, which clients use to pay for storage on the Arbitrum network.

Implementations

impl QuoteGenerator

pub fn new( rewards_address: RewardsAddress, metrics_tracker: QuotingMetricsTracker, ) -> Self

Create a new quote generator without signing capability.

Call set_signer to enable quote signing.

Arguments

• rewards_address - The EVM address for receiving payments
• metrics_tracker - Tracker for quoting metrics

pub fn set_signer<F>(&mut self, pub_key: Vec<u8>, sign_fn: F)

where F: Fn(&[u8]) -> Vec<u8> + Send + Sync + 'static,

Set the signing function for quote generation.

Arguments

• pub_key - The node’s public key bytes
• sign_fn - Function that signs bytes and returns signature

pub fn can_sign(&self) -> bool

Check if the generator has signing capability.

pub fn probe_signer(&self) -> Result<()>

Probe the signer with test data to verify it produces a non-empty signature.

Errors

Returns an error if no signer is set or if signing produces an empty signature.

pub fn create_quote( &self, content: XorName, data_size: usize, data_type: u32, ) -> Result<PaymentQuote>

Generate a payment quote for storing data.

Arguments

• content - The XorName of the content to store
• data_size - Size of the data in bytes
• data_type - Type index of the data (0 for chunks)

Returns

A signed PaymentQuote that the client can use to pay on-chain.

Errors

Returns an error if signing is not configured.

pub fn rewards_address(&self) -> &RewardsAddress

Get the rewards address.

pub fn current_metrics(&self) -> QuotingMetrics

Get current quoting metrics.

pub fn record_payment(&self)

Record a payment received (delegates to metrics tracker).

pub fn record_store(&self, data_type: u32)

Record data stored (delegates to metrics tracker).

pub fn create_merkle_candidate_quote( &self, data_size: usize, data_type: u32, merkle_payment_timestamp: u64, ) -> Result<MerklePaymentCandidateNode>

Create a merkle candidate quote for batch payment using ML-DSA-65.

Returns a MerklePaymentCandidateNode constructed with the node’s ML-DSA-65 public key and signature. This uses the same post-quantum signing stack as regular payment quotes, rather than the ed25519 signing that the upstream ant-evm library assumes.

The pub_key field stores the raw ML-DSA-65 public key bytes, and signature stores the ML-DSA-65 signature over bytes_to_sign(). Clients verify these using verify_merkle_candidate_signature().

Errors

Returns an error if signing is not configured.