Operator RFQ Pricing Server

This system defines a simplified decentralized pricing mechanism in which each operator runs a local RPC server to respond to user price requests. Prices are generated based on benchmarking configurations for specific blueprints and cached in a local key-value store. When a user requests a quote, the operator returns a signed price quote that includes an expiry block number or timestamp for on-chain verification.

🔄 System Flow Diagram

graph TD
  subgraph Operator
    A1["Blueprint Registered or Price Updated"] --> B1["Run Benchmark"]
    B1 --> C1["Compute Price for Blueprint"]
    C1 --> D1["Store Price in Cache (KV DB)"]

    E1["Incoming Price Request"] --> F1["Lookup Price in Cache"]
    F1 --> G1["Sign Price with Expiry"]
    G1 --> H1["Send Price Response"]
  end

  subgraph User
    H1 --> I1["Verify Signature"]
    I1 --> J1["Submit Quote On-chain"]
  end

🔧 Technologies Used

• Rust (Operator server and benchmarking engine)
• Tonic (gRPC server)
• SQLite / RocksDB / Sled (for local price cache)
• ed25519 / secp256k1 (signature scheme)
• SHA256 (message hashing)
• Web3 library (optional: for on-chain verification testing)

📁 File Structure

operator_rfq/
├── Cargo.toml
├── src/
│   ├── main.rs         # RPC server + request handler
│   ├── benchmark.rs    # Benchmarking logic per blueprint
│   ├── pricing.rs      # Price computation engine
│   ├── cache.rs        # Local DB wrapper (RocksDB or SQLite)
│   ├── signer.rs       # Signature generation + verification
│   └── proto/          # gRPC proto definitions
└── README.md           # This file

✍️ Example Flow

Blueprint Registration or Price Update:

1. Operator receives new blueprint registration.
2. Runs a benchmark (e.g. CPU time, memory, disk I/O).
3. Calculates pricing model (e.g. linear or exponential curve).
4. Stores result in local database: price_cache[blueprint_hash] = PriceModel { price_per_unit, timestamp }

User Request:

1. User sends a GetPrice(blueprint_hash) RPC request.
2. Operator fetches cached price.
3. Signs the quote with:
   • Price amount
   • Blueprint hash
   • Timestamp or block number
4. Sends back SignedQuote { price, blueprint_hash, timestamp, signature }

On-Chain Verification:

1. Smart contract checks:
   • Signature is valid.
   • Block number is within expiry.
   • The quoted blueprint matches user job.

⚡ Quote Signature Format

struct QuotePayload {
    blueprint_hash: [u8; 32],
    price_wei: u128,
    timestamp_or_block: u64,
}

Hash with sha256, sign with ed25519:

let msg = sha256(encode(&QuotePayload));
let sig = keypair.sign(&msg);

🚀 Quick Start

# Build the server
cargo build --release

# Run the gRPC server
cargo run --bin operator_rfq

✅ Future Extensions

• Add support for multi-resource pricing (CPU + RAM + storage).
• Implement on-chain validation smart contract.
• Add gossip/pubsub for broadcasting available blueprints.
• Add reputation system to weigh operator reliability.

📅 License

MIT or Apache 2.0