# Services from aether-x402.vercel.app on Zero > aether-x402.vercel.app serves 22 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/aether-x402.vercel.app Live health (JSON, refreshed every minute): https://www.zero.xyz/host/aether-x402.vercel.app/health.json ## Services - [Aether x402 Preflight Auditor](https://www.zero.xyz/c/aether-x402-preflight-auditor-5a6f94d5/llms.txt): $0.01/call via x402. Audits a public x402-gated endpoint to verify it is correctly configured and payable via USDC on Base, returning a scored verdict with pass/warn/fail checks. - [Aether Base Token Risk Analyzer](https://www.zero.xyz/c/aether-base-token-risk-analyzer-6a8dfc5b/llms.txt): $0.01/call via x402. Analyzes a Base ERC-20 token contract for risk flags, market data, and buy/sell simulation to produce a risk verdict and score. - [Aether ERC-20 Balance Lookup on Base](https://www.zero.xyz/c/aether-erc-20-balance-lookup-on-base-94beef98/llms.txt): $0.002/call via x402. Returns the ERC-20 token balance for a given wallet address on the Base network, including raw amount, symbol, decimals, and human-readable formatted value. - [Aether Base ETH Balance Lookup](https://www.zero.xyz/c/aether-base-eth-balance-lookup-0ecdfedb/llms.txt): $0.001/call via x402. Returns the ETH balance (in ETH and wei) for a given Base network wallet address, paid via x402 micropayment in USDC. - [Aether Base Token Allowance Lookup](https://www.zero.xyz/c/aether-base-token-allowance-lookup-26c6372f/llms.txt): $0.002/call via x402. Queries the ERC-20 token spending allowance granted by an owner address to a spender address on Base mainnet. - [Aether Base Portfolio Lookup](https://www.zero.xyz/c/aether-base-portfolio-lookup-e55d6d3c/llms.txt): $0.004/call via x402. Fetches the token holdings and USD portfolio value for a Base network wallet address, optionally filtered to specific token contracts. - [Aether Base Block Lookup](https://www.zero.xyz/c/aether-base-block-lookup-0b44a9b2/llms.txt): $0.001/call via x402. Retrieves metadata for a specific block on the Base blockchain, including block number, transaction count, and timestamp. - [Aether Base Basename Lookup](https://www.zero.xyz/c/aether-base-basename-lookup-2c952f98/llms.txt): $0.003/call via x402. Resolves a Base Name Service (Basename) handle to its associated wallet address and ENS records on the Base blockchain. - [Aether Base Gas Price Lookup](https://www.zero.xyz/c/aether-base-gas-price-lookup-c42df100/llms.txt): $0.01/call via x402. Returns current Base network gas fee estimates including base fee, max fee, and priority fee in Gwei. - [Aether Base Transaction Receipt Lookup](https://www.zero.xyz/c/aether-base-transaction-receipt-lookup-280abc30/llms.txt): $0.003/call via x402. Fetches decoded receipt data for a Base blockchain transaction by hash, including gas used and token transfers. - [Aether Base Token Risk & Onchain Data](https://www.zero.xyz/c/aether-base-token-risk-onchain-data-0f5a729b/llms.txt): $0.002/call via x402. Looks up onchain metadata and risk verdicts for a Base network ERC-20 token by contract address - [Aether Base Token Transfer History](https://www.zero.xyz/c/aether-base-token-transfer-history-467cf5ad/llms.txt): $0.01/call via x402. Fetches on-chain ERC-20 or native token transfer history for a given address or token contract on the Base network over a specified block range. - [Aether Base Token Price Lookup](https://www.zero.xyz/c/aether-base-token-price-lookup-55454968/llms.txt): $0.003/call via x402. Returns the current USD price and best liquidity pool for a given ERC-20 token contract address on the Base blockchain. - [Aether Base Gas Estimator](https://www.zero.xyz/c/aether-base-gas-estimator-9255f452/llms.txt): $0.002/call via x402. Estimates the gas cost (in gas units, ETH, and USD) for a given transaction on the Base blockchain network. - [Aether Base Contract Onchain Data Lookup](https://www.zero.xyz/c/aether-base-contract-onchain-data-lookup-8890db38/llms.txt): $0.01/call via x402. Fetches onchain metadata and risk signals for a contract address on Base, including proxy details, code size, ERC standards, and x402 payability audit results. - [Aether NFT Metadata Lookup (Base)](https://www.zero.xyz/c/aether-nft-metadata-lookup-base-14cb40a6/llms.txt): $0.005/call via x402. Fetches on-chain NFT metadata (name, image, tokenURI) for a given contract and token ID on the Base network, paid via x402 (USDC on Base). - [Aether NFT Owner Lookup on Base](https://www.zero.xyz/c/aether-nft-owner-lookup-on-base-2d42d1aa/llms.txt): $0.01/call via x402. Returns the current owner address of a specific NFT on the Base blockchain given a contract address and token ID. - [Aether Base Onchain Data & Token Risk](https://www.zero.xyz/c/aether-base-onchain-data-token-risk-d779c2b8/llms.txt): $0.01/call via x402. Executes Base blockchain eth_call operations to retrieve onchain data, token risk verdicts, and x402 payability audits, paid per-call in USDC via x402. - [Aether Base Transaction Lookup](https://www.zero.xyz/c/aether-base-transaction-lookup-4da59db2/llms.txt): $0.003/call via x402. Looks up a Base blockchain transaction by hash and returns decoded details including sender, receiver, status, and ETH value transferred. - [Aether: x402 Payability Evidence Audit](https://www.zero.xyz/c/aether-x402-payability-evidence-audit-75d55f00/llms.txt): $0.25/call via x402. Audits a block of text or API description for contradictions and unsupported claims related to Base onchain data, token risk, and x402 payability. - [Aether Opportunity Score](https://www.zero.xyz/c/aether-opportunity-score-63084f79/llms.txt): $0.01/call via x402. Scores a business or investment opportunity by stage, pillars, and red flags, returning a numeric score and recommendation verdict. - [Aether Invoice Triage – Base Onchain Data & Token Risk](https://www.zero.xyz/c/aether-invoice-triage-base-onchain-data-token-risk-77867e7c/llms.txt): $0.5/call via x402. Triages an invoice by amount, aging, and reference to return a next-action recommendation and aging category, payable via x402 (USDC on Base). Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. - [Zero catalog index](https://www.zero.xyz/llms.txt)