Question 1

What is a Binance Smart Chain archive node and when do you need one?

Accepted Answer

A Binance Smart Chain (BNB Smart Chain) archive node keeps the full historical state of the chain, so you can query balances, storage slots, and contract state at any past block height. Standard full nodes prune old state, which is why historical queries fail against them. Archive access is essential for analytics, tax and accounting tools, indexers, and any backend that needs to reconstruct what happened at a specific block. You can connect to an archive-capable endpoint through OnFinality's RPC API or run a dedicated archive node when your workload needs consistent historical throughput.

Question 2

What is a public Solana RPC endpoint and when should you use one?

Accepted Answer

A public Solana RPC endpoint is a shared, no-signup URL that lets you read from and submit transactions to Solana mainnet without running your own validator or RPC node. It is ideal for learning, prototyping, hackathon demos, and low-volume scripts, but shared capacity means you should expect variable performance and rate limits under load.

This page explains how public Solana RPC works, how to connect with curl and JavaScript, the exact mainnet settings you need, and the point at which a managed or dedicated endpoint becomes the better choice for production apps.

Question 3

BNB Smart Chain RPC: Endpoint Settings, Chain ID, and Debugging

Accepted Answer

BNB Smart Chain (BSC) exposes an EVM-compatible JSON-RPC interface, so most Ethereum tooling works after you point it at a BSC endpoint and set chain ID 56. This page covers the endpoint format, wallet and library configuration, the methods that matter for BSC apps, and how to debug the failures you are most likely to hit.

You can start against the public OnFinality endpoint for quick tests, then move to a managed RPC API or a dedicated node when you need predictable throughput, archive access, or WebSocket subscriptions for production traffic.

Question 4

Celo API Access: Chain Settings, Methods, and Failure Modes

Accepted Answer

The Celo API is a JSON-RPC interface that lets your application read chain state, submit transactions, and subscribe to events on Celo Mainnet. You connect to it through an HTTPS endpoint using standard EVM methods such as eth_blockNumber, eth_getBalance, and eth_call, plus Celo-specific calls for fee currencies and mobile-friendly gas abstraction. This article covers the chain settings you need, how to send your first request, and how to diagnose the failures developers hit most often. It also explains when a shared public endpoint is enough and when a dedicated Celo node is the better fit for production workloads.

Question 5

TON API Keys: How Do You Get One and When Do You Need It?

Accepted Answer

A TON API key is a credential that authenticates your requests to a TON RPC or HTTP API endpoint, letting a provider attribute traffic to your project and apply its own rate limits and access rules. Public endpoints usually work without a key, but they are shared and best suited to prototypes, while production apps typically need a keyed endpoint or a dedicated node.

This article explains what a TON API key actually does, how to get one, how to send your first authenticated request, and when a shared keyed endpoint stops being enough and a dedicated TON node becomes the better fit.

Question 6

What Is a Solana Devnet Address and How Do You Use One?

Accepted Answer

A Solana devnet address is a public key on the Solana devnet cluster, a test network that mirrors mainnet behavior without using real SOL. You use it to airdrop test SOL, deploy programs, and run transactions before shipping to mainnet. The address format is identical to mainnet, so the only thing that changes is the RPC endpoint your tooling points at.

This article explains how devnet addresses differ from mainnet, how to generate and fund one, how to configure wallets and RPC clients, and how to debug the errors that show up when a devnet address is unfunded or pointed at the wrong cluster.

Question 7

What RPC URL should I use for Solana?

Accepted Answer

A Solana RPC URL is the HTTP or WebSocket endpoint your app sends JSON-RPC calls to for reading accounts, submitting transactions, and subscribing to on-chain events. OnFinality exposes a public Solana endpoint at https://solana.api.onfinality.io/public and a matching WebSocket at wss://solana.api.onfinality.io/public-ws, which you can drop into wallets, SDKs, and scripts for testing.

Public endpoints are convenient for development, but production apps usually need dedicated capacity, predictable throughput, and failover. This article covers where the Solana RPC URL goes in common tools, how to verify it works, and when to move from a shared public endpoint to dedicated Solana node infrastructure.

Question 8

Polygon Mainnet RPC: How Do You Connect to Chain ID 137?

Accepted Answer

Polygon Mainnet is an EVM-compatible chain identified by chain ID 137, with POL as its native gas token. To connect, point your wallet or app at an HTTP or WebSocket RPC endpoint and confirm the chain ID matches 137 before sending transactions. OnFinality provides a public Polygon endpoint for testing and dedicated Polygon node infrastructure for production workloads that need consistent capacity.

Question 9

What should I know about Polygon PoS endpoints?

Accepted Answer

Polygon PoS endpoints are the HTTP and WebSocket URLs your app uses to read chain state and submit transactions to the Polygon proof-of-stake network. The mainnet chain ID is 137, the native gas token is POL, and a working endpoint needs to support the JSON-RPC methods your workload actually calls. This page covers chain settings, endpoint options, request examples, and the failure modes that show up in production.

Use it to decide whether a shared public endpoint is enough for your traffic or whether you need a dedicated Polygon node. OnFinality provides Polygon PoS RPC through its API service and dedicated node infrastructure, so you can start on a shared endpoint and move to isolated capacity as your request volume or indexing needs grow.

Question 10

Which Solana RPC services offer enhanced APIs tailored for NFT and DeFi data?

Accepted Answer

Most Solana RPC providers expose the same core JSON-RPC surface, so the real differentiator for NFT and DeFi workloads is how well a provider handles token accounts, program logs, compressed NFTs, and high-volume getProgramAccounts calls. Enhanced APIs usually mean indexed or specialized methods layered on top of standard RPC, plus dedicated node capacity for the read patterns that NFT marketplaces and DeFi dashboards generate. OnFinality provides Solana RPC API access and dedicated node infrastructure that teams can size around these workloads, with HTTP and WebSocket transports available.

Question 11

Solana RPC Nodes: Endpoints, Methods, and Workload Fit

Accepted Answer

Solana RPC nodes expose the JSON-RPC interface your app uses to read accounts, submit transactions, and subscribe to slot or account changes. This page covers the endpoint shape, the methods that matter most in practice, and how to decide between shared public RPC and a dedicated node as your workload grows.

You will get a connectable endpoint example, a workload-to-setup table, a debugging path for common failures, and a short checklist for evaluating a provider before you move traffic to it.

Question 12

How do Solana NFT API providers handle scalability and low-latency data retrieval?

Accepted Answer

Solana NFT applications depend on fast, consistent access to on-chain state: token accounts, metadata pointers, mint authorities, and compressed NFT proofs. The bottleneck is rarely the API wrapper itself — it is the RPC layer underneath it. When that layer is shared and rate-limited, metadata lookups, holder snapshots, and wallet refreshes slow down under load.

This article explains how to evaluate Solana NFT API providers for scalability and low-latency retrieval, which RPC methods and transports matter, and when a dedicated Solana node is the better fit than a shared endpoint. It includes endpoint settings, a curl example, and a failure-mode table you can use during provider evaluation.

API Service

Dedicated Nodes

Enterprise Nodes

Indexer Services

Network Prototyping Tools

Staking & Validators

AI Agent

RPC documentation entries

What is a Binance Smart Chain archive node and when do you need one?

What is a public Solana RPC endpoint and when should you use one?

BNB Smart Chain RPC: Endpoint Settings, Chain ID, and Debugging

Celo API Access: Chain Settings, Methods, and Failure Modes

TON API Keys: How Do You Get One and When Do You Need It?

What Is a Solana Devnet Address and How Do You Use One?

What RPC URL should I use for Solana?

Polygon Mainnet RPC: How Do You Connect to Chain ID 137?

What should I know about Polygon PoS endpoints?

Which Solana RPC services offer enhanced APIs tailored for NFT and DeFi data?

Solana RPC Nodes: Endpoints, Methods, and Workload Fit

How do Solana NFT API providers handle scalability and low-latency data retrieval?

Never Worry about Infrastructure Again

Supported Networks

Product

Company

Resources

OnFinality RPC Assistant

RPC documentation entries

What is a Binance Smart Chain archive node and when do you need one?

What is a public Solana RPC endpoint and when should you use one?

BNB Smart Chain RPC: Endpoint Settings, Chain ID, and Debugging

Celo API Access: Chain Settings, Methods, and Failure Modes

TON API Keys: How Do You Get One and When Do You Need It?

What Is a Solana Devnet Address and How Do You Use One?

What RPC URL should I use for Solana?

Polygon Mainnet RPC: How Do You Connect to Chain ID 137?

What should I know about Polygon PoS endpoints?

Which Solana RPC services offer enhanced APIs tailored for NFT and DeFi data?

Solana RPC Nodes: Endpoints, Methods, and Workload Fit

How do Solana NFT API providers handle scalability and low-latency data retrieval?

Never Worry about Infrastructure Again

Supported Networks

Product

Company

Resources