---
title: "Glossary"
description: "Common terms used throughout BlockReq documentation"
url: "https://blockreq.com/docs/welcome/glossary/"
---

# Glossary

| Term                   | Definition                                                                                                                         |
| ---------------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
| **Request Counting**   | How BlockReq counts distinguishable customer Requests and Requests used.                                                           |
| **Requests**           | Customer JSON-RPC items and successfully delivered WSS events or notifications.                                                    |
| **Requests used**      | Requests after the method multiplier is applied.                                                                                   |
| **Requests remaining** | Spendable prepaid Requests across active free-grant and Request Pack lots.                                                         |
| **Request Pack**       | A one-time prepaid request lot (Starter, Growth, Professional, or Business) with its own validity window.                          |
| **PAYG**               | Billing mode that accrues at $3.90 per 1M Requests used after prepaid Requests are exhausted.                                      |
| **Wallet balance**     | Settled USD value used to fund PAYG and eligible purchases; separate from Requests remaining.                                      |
| **Endpoint**           | A chain-specific RPC access point with credential and policy metadata.                                                             |
| **API Key**            | A credential used to authenticate endpoint requests.                                                                               |
| **Chain**              | A blockchain network such as Ethereum Mainnet, Base, or BSC.                                                                       |
| **JSON-RPC**           | The request/response protocol used by supported blockchain nodes.                                                                  |
| **HTTPS**              | Secure HTTP transport for standard request-response RPC calls.                                                                     |
| **WSS**                | WebSocket Secure transport for persistent connections and real-time subscriptions such as `eth_subscribe`.                         |
| **Archive Data**       | Historical blockchain state for deep-history reads. Availability depends on chain and route capability, not only the billing tier. |
| **Rate Limit**         | Sustained and burst request limits from the effective plan.                                                                        |
| **Free grant**         | A 3M-Request lot with a 30-day validity window.                                                                                    |