AI agents: Web3 developer tools

Best for Let APIs charge AI agents per request in stablecoins

Chains

Solana Base Arbitrum Polygon

Price

Facilitator: 1,000 transactions free per month, then $0.001 per transaction (gas separate)

An open HTTP-402 payment protocol plus Coinbase's hosted facilitator, so an API can charge AI agents per request in stablecoins. The facilitator documents Base, Polygon, Arbitrum and Solana mainnets; 1,000 transactions a month are free, then a tenth of a cent each, plus gas.

Best for Stablecoin wallets with spend limits for AI agents

Chains

Solana Base BNB Chain Arbitrum Polygon Stellar

Price

Free 1,000 Monthly Active Wallets, then $0.025/MAU; custom from $0.02/MAW

License

Proprietary

Server-signed stablecoin wallets with spend permissions so an agent can pay through x402 or on-chain transfers. Self-serve on Base, Solana, BNB Chain, Arbitrum, Polygon and Stellar; Ethereum and Avalanche are by request through sales. The first 1,000 monthly active wallets are free.

Best for MCP server for AI clients to read and transact on BNB Chain

Chains

Ethereum Base BNB Chain Arbitrum Polygon

Price

Free (open source)

License

MIT

BNB Chain's MCP server lets AI clients read and transact on BNB Smart Chain and other EVM chains, including agent registration. Free and MIT-licensed. Its README warns that the SSE endpoint is unauthenticated, so don't expose it publicly.

Best for Agent toolkit for Hedera tokens, accounts and contracts

Chains

Hedera testnet

Price

Free (open source)

License

Apache-2.0

Hashgraph's JavaScript and Python agent toolkit with plugins for Hedera tokens, accounts, consensus and contracts, plus LangChain, Vercel AI and MCP adapters. Free and Apache-2.0. The pages we checked only show testnet setup, so we list it as testnet.

Best for Let AI clients build and sign Algorand transactions

Chains

Algorand

Price

Free (open source)

License

MIT

A third-party MCP server (GoPlausible, not the Algorand Foundation) with a local agent wallet that builds, signs and submits Algorand transactions. Mainnet by default, with testnet and localnet. Free and MIT. Wallet mnemonics are stored in a local file, so treat the machine it runs on accordingly.