# Services from synapse-api-brown.vercel.app on Zero > synapse-api-brown.vercel.app serves 427 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero. Canonical page: https://www.zero.xyz/host/synapse-api-brown.vercel.app Live health (JSON, refreshed every minute): https://www.zero.xyz/host/synapse-api-brown.vercel.app/health.json ## Services - [Synapse API — Blockchain Transaction History Lookup](https://www.zero.xyz/c/synapse-api-blockchain-transaction-history-lookup-860b4db9/llms.txt): $0.01/call via x402. Retrieves paginated historical transactions for a blockchain address across 57+ networks, filtered by block range, category, and address - [Synapse API — Linea Transaction History](https://www.zero.xyz/c/synapse-api-linea-transaction-history-4d0af6de/llms.txt): $0.01/call via x402. Retrieves the full transaction history for addresses on the Linea blockchain network, with filtering by block range, address, category, and ordering. - [Synapse API — Avalanche Token Transfers](https://www.zero.xyz/c/synapse-api-avalanche-token-transfers-8d81d552/llms.txt): $0.01/call via x402. Retrieves ERC-20 and native token transfer history for a given address or contract on the Avalanche blockchain network. - [Synapse API — Ethereum Transaction History](https://www.zero.xyz/c/synapse-api-ethereum-transaction-history-8a19d8b1/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for Ethereum addresses, filtered by block range, category, and direction, via pay-per-call x402 billing. - [Synapse API — Plasma Token Transfers](https://www.zero.xyz/c/synapse-api-plasma-token-transfers-24fa0b99/llms.txt): $0.01/call via x402. Fetches ERC-20 and other token transfer events for a specific wallet address across blockchain networks, with pagination and block range filtering - [Synapse API — SEI Token Transfers](https://www.zero.xyz/c/synapse-api-sei-token-transfers-776c856d/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given owner address on the SEI blockchain, with filtering by block range, contract, and pagination. - [Synapse API — Base Blockchain Transaction History](https://www.zero.xyz/c/synapse-api-base-blockchain-transaction-history-cdfce843/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the Base blockchain network, with filtering by block range, category, and address. - [Synapse API — ADI Token Transfers](https://www.zero.xyz/c/synapse-api-adi-token-transfers-5d7feb1f/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given wallet owner address across blockchain networks, with filtering by block range, contract addresses, and pagination support. - [Synapse API — ADI Transaction History](https://www.zero.xyz/c/synapse-api-adi-transaction-history-ad4159c8/llms.txt): $0.01/call via x402. Fetches paginated transaction history for a blockchain address across 57+ networks via the Alchemy Data Infrastructure (ADI) API - [Synapse API — Polygon Token Transfer History](https://www.zero.xyz/c/synapse-api-polygon-token-transfer-history-cf674009/llms.txt): $0.01/call via x402. Retrieves historical ERC-20 and native token transfer events for a given address or contract on the Polygon network - [Synapse API — Token Transfers Lookup](https://www.zero.xyz/c/synapse-api-token-transfers-lookup-5a8f1108/llms.txt): $0.01/call via x402. Retrieves historical token transfer events for a given wallet address across blockchain networks, filtered by block range, contract addresses, and pagination options. - [Synapse API — BNB Token Transfers Lookup](https://www.zero.xyz/c/synapse-api-bnb-token-transfers-lookup-f4aa459f/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given wallet address on the BNB (BNB Chain) blockchain, with filtering by block range, contract addresses, and pagination. - [Synapse API — Polygon Transaction History](https://www.zero.xyz/c/synapse-api-polygon-transaction-history-2039983b/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the Polygon blockchain network - [Synapse API — ZKsync Token Transfers](https://www.zero.xyz/c/synapse-api-zksync-token-transfers-8dc60a91/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given address on the ZKsync blockchain network, with filtering by block range, contract, and pagination. - [Synapse API — Polygon NFT by Owner](https://www.zero.xyz/c/synapse-api-polygon-nft-by-owner-995e20fd/llms.txt): $0.01/call via x402. Returns a paginated list of NFTs owned by a specified wallet address on the Polygon blockchain - [Synapse API — Katana Token Transfers](https://www.zero.xyz/c/synapse-api-katana-token-transfers-19dda84b/llms.txt): $0.01/call via x402. Retrieves token transfer history for a wallet or contract address on Katana (blockchain), with filtering by block range, contract, and pagination. - [Synapse API — Token Balances Lookup](https://www.zero.xyz/c/synapse-api-token-balances-lookup-2a0cc9a4/llms.txt): $0.01/call via x402. Retrieves token balances for a given wallet owner address across specified ERC-20 or multi-chain contract addresses - [Synapse API — ApeChain NFT Sales](https://www.zero.xyz/c/synapse-api-apechain-nft-sales-fad1c7f7/llms.txt): $0.01/call via x402. Retrieves NFT sales transaction history on the ApeChain blockchain, filterable by contract address and block range. - [Synapse API — Worldchain Token Transfers](https://www.zero.xyz/c/synapse-api-worldchain-token-transfers-6dec7947/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given wallet address on the Worldchain blockchain network, with filtering by block range, contract addresses, and pagination. - [Synapse API — Gnosis NFT Sales](https://www.zero.xyz/c/synapse-api-gnosis-nft-sales-03e3bdd6/llms.txt): $0.01/call via x402. Retrieves NFT sale events on the Gnosis blockchain, filterable by contract address and block range - [Synapse API — Ethereum RPC Endpoint](https://www.zero.xyz/c/synapse-api-ethereum-rpc-endpoint-2c9611d6/llms.txt): $0.01/call via x402. Provides pay-per-call JSON-RPC access to the Ethereum blockchain network via x402 micropayments - [Synapse API — Gnosis Token Balances](https://www.zero.xyz/c/synapse-api-gnosis-token-balances-e0d67df2/llms.txt): $0.01/call via x402. Fetches ERC-20 token balances for a given wallet address on the Gnosis (xDai) blockchain, optionally filtered by specific contract addresses. - [Synapse API — Ronin Token Transfers](https://www.zero.xyz/c/synapse-api-ronin-token-transfers-807d3a96/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given owner address on the Ronin blockchain network, with optional filtering by block range and contract addresses. - [Synapse API — Citrea Gas Estimator](https://www.zero.xyz/c/synapse-api-citrea-gas-estimator-9f40666f/llms.txt): $0.01/call via x402. Estimates the gas cost for a transaction on the Citrea blockchain network before submission - [Synapse API — Boba Network Token Transfers](https://www.zero.xyz/c/synapse-api-boba-network-token-transfers-60808576/llms.txt): $0.01/call via x402. Retrieves token transfer history for a specified wallet address on the Boba Network blockchain, with filtering by block range, contract addresses, and pagination support. - [Synapse API — XLayer Token Metadata Lookup](https://www.zero.xyz/c/synapse-api-xlayer-token-metadata-lookup-6c2cad7e/llms.txt): $0.01/call via x402. Returns token metadata (name, symbol, decimals, etc.) for a given ERC-20 or similar contract address on the XLayer blockchain network. - [Synapse API — Polygon Token Balances](https://www.zero.xyz/c/synapse-api-polygon-token-balances-e9596486/llms.txt): $0.01/call via x402. Retrieves ERC-20 token balances for a given wallet address on the Polygon network, optionally filtered by specific contract addresses - [Synapse API — Base NFT Metadata Lookup](https://www.zero.xyz/c/synapse-api-base-nft-metadata-lookup-fb3a4066/llms.txt): $0.01/call via x402. Fetches on-chain NFT metadata for a given contract address and token ID on the Base blockchain network - [Synapse API — SEI NFT Floor Price](https://www.zero.xyz/c/synapse-api-sei-nft-floor-price-f631bc0b/llms.txt): $0.01/call via x402. Returns the current floor price for an NFT collection on the SEI blockchain given a contract address - [Synapse API — Kaia Token Transfers](https://www.zero.xyz/c/synapse-api-kaia-token-transfers-1a4ab713/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given owner address on the Kaia blockchain, with optional filtering by block range, contract addresses, and pagination. - [Synapse API — Ronin NFT Sales](https://www.zero.xyz/c/synapse-api-ronin-nft-sales-a7221965/llms.txt): $0.01/call via x402. Fetches NFT sales transaction history on the Ronin blockchain, filterable by contract address and block range. - [Synapse API — Polygon NFT Floor Price](https://www.zero.xyz/c/synapse-api-polygon-nft-floor-price-e9d107dc/llms.txt): $0.01/call via x402. Returns the current floor price for an NFT collection on the Polygon blockchain given a contract address - [Synapse API — Monad Token Balances](https://www.zero.xyz/c/synapse-api-monad-token-balances-9f8114a3/llms.txt): $0.01/call via x402. Retrieves token balances for a given wallet address across specified ERC-20/token contract addresses on the Monad blockchain network - [Synapse API — Ethereum NFT by Owner](https://www.zero.xyz/c/synapse-api-ethereum-nft-by-owner-7a76221b/llms.txt): $0.01/call via x402. Returns all NFTs owned by a given Ethereum wallet address, with optional pagination - [Synapse API — Linea Token Transfers](https://www.zero.xyz/c/synapse-api-linea-token-transfers-1376f6b1/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given address on the Linea blockchain network, with filtering by block range, contract, and pagination. - [Synapse API — Celo Token Metadata Lookup](https://www.zero.xyz/c/synapse-api-celo-token-metadata-lookup-601c7f45/llms.txt): $0.01/call via x402. Fetches on-chain token metadata (name, symbol, decimals, etc.) for a given contract address on the Celo blockchain network. - [Synapse API — Ronin Transaction History](https://www.zero.xyz/c/synapse-api-ronin-transaction-history-b9244483/llms.txt): $0.01/call via x402. Fetches paginated transaction history for addresses on the Ronin blockchain network - [Synapse API — Gnosis Token Transfers](https://www.zero.xyz/c/synapse-api-gnosis-token-transfers-a479ae98/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given wallet address on the Gnosis blockchain network, with optional filtering by block range, contract addresses, and pagination. - [Synapse API — Zora NFT by Owner Lookup](https://www.zero.xyz/c/synapse-api-zora-nft-by-owner-lookup-5e0d36d6/llms.txt): $0.01/call via x402. Fetches all NFTs owned by a given wallet address on the Zora protocol, with optional pagination support. - [Synapse API — Linea NFT Lookup by Owner](https://www.zero.xyz/c/synapse-api-linea-nft-lookup-by-owner-9456a714/llms.txt): $0.01/call via x402. Returns all NFTs owned by a given wallet address on the Linea blockchain network - [Synapse API — Optimism RPC Endpoint](https://www.zero.xyz/c/synapse-api-optimism-rpc-endpoint-374b9df9/llms.txt): $0.01/call via x402. Proxies JSON-RPC calls to the Optimism (OP Mainnet) blockchain network, enabling agents to read chain state, send transactions, and interact with smart contracts. - [Synapse API — Monad Token Transfers](https://www.zero.xyz/c/synapse-api-monad-token-transfers-dbd6e9ab/llms.txt): $0.01/call via x402. Retrieves token transfer history for a specific owner address on the Monad blockchain, with optional filtering by block range, contract, and count. - [Synapse API — Celo Transaction History](https://www.zero.xyz/c/synapse-api-celo-transaction-history-64c6b863/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the Celo blockchain, with filtering by block range, category, and direction. - [Synapse API — Berachain Transaction History](https://www.zero.xyz/c/synapse-api-berachain-transaction-history-76e9f973/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the Berachain blockchain network - [Synapse API — Avalanche Transaction History](https://www.zero.xyz/c/synapse-api-avalanche-transaction-history-a4eed308/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the Avalanche blockchain network - [Synapse API — Ethereum Token Transfer History](https://www.zero.xyz/c/synapse-api-ethereum-token-transfer-history-668b4a42/llms.txt): $0.01/call via x402. Retrieves historical ERC-20 and native token transfer events for a given Ethereum address, with filtering by block range, contract, and pagination support. - [Synapse API — BNB Chain Transaction History](https://www.zero.xyz/c/synapse-api-bnb-chain-transaction-history-0e8d9b18/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the BNB (Binance Smart Chain) blockchain network - [BNB Chain Token Balance Lookup](https://www.zero.xyz/c/bnb-chain-token-balance-lookup-24ff51cb/llms.txt): $0.01/call via x402. Returns token balances for a given wallet address across specified BEP-20 contract addresses on BNB Chain - [Synapse API — NFTs by Owner on Base](https://www.zero.xyz/c/synapse-api-nfts-by-owner-on-base-027e542c/llms.txt): $0.01/call via x402. Retrieves all NFTs owned by a given wallet address on the Base blockchain network - [Synapse API — Optimism Transaction History](https://www.zero.xyz/c/synapse-api-optimism-transaction-history-7dbba2d9/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the Optimism blockchain network - [Synapse API — Sonic Token Transfers](https://www.zero.xyz/c/synapse-api-sonic-token-transfers-d06646d9/llms.txt): $0.01/call via x402. Retrieves token transfer history for a given wallet address on the Sonic blockchain network, with filtering by block range, contract addresses, and pagination. - [Synapse API — Abstract Transaction History](https://www.zero.xyz/c/synapse-api-abstract-transaction-history-2f2243a5/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for a given address or address pair across Abstract blockchain using block range and category filters. - [Synapse API — Gnosis Chain Transaction History](https://www.zero.xyz/c/synapse-api-gnosis-chain-transaction-history-46cc973b/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for addresses on the Gnosis blockchain network - [Synapse API — ZKsync Transaction History](https://www.zero.xyz/c/synapse-api-zksync-transaction-history-e8cb8c27/llms.txt): $0.01/call via x402. Retrieves paginated transaction history for address … (truncated at 16384 bytes)