# Services from tereno.xyz on Zero

> tereno.xyz serves 12 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/tereno.xyz
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/tereno.xyz/health.json

## Services

- [Tereno Contract Guard — Smart Contract Safety Verdict](https://www.zero.xyz/c/tereno-contract-guard-smart-contract-safety-verdict-e711f313/llms.txt): $0.1/call via x402. Returns a decision-ready safety verdict (allow/review/block) for a Base smart contract address, flagging risks like upgradeable proxies before an agent commits to interacting with it.
- [Tereno Contract Interface Detector](https://www.zero.xyz/c/tereno-contract-interface-detector-7defccd4/llms.txt): $0.02/call via x402. Probes a Base blockchain contract address and returns a decision-ready verdict on which ERC/EIP interfaces it implements (ERC-20, ERC-721, ERC-1155, ERC-165, EIP-1967 proxy)
- [Tereno Aerodrome Swap Guard](https://www.zero.xyz/c/tereno-aerodrome-swap-guard-e572196c/llms.txt): $0.25/call via x402. Validates and simulates an Aerodrome DEX swap transaction on Base, returning a allow/deny verdict before the swap is submitted on-chain.
- [Tereno Contract Change Detection](https://www.zero.xyz/c/tereno-contract-change-detection-b58cbb26/llms.txt): $0.02/call via x402. Detects whether a Base smart contract has changed since the last Tereno observation, returning a decision-ready verdict (allow/review/block) and a diff of any bytecode or proxy changes
- [Tereno Chain Snapshot — Base Network State Verdict](https://www.zero.xyz/c/tereno-chain-snapshot-base-network-state-verdict-2391e8be/llms.txt): $0.005/call via x402. Returns a real-time snapshot of the Base (EIP-155:8453) blockchain including current block number, gas fee recommendations, and an 'allow/deny' decision verdict for agent use.
- [Tereno Obligation Verdict](https://www.zero.xyz/c/tereno-obligation-verdict-669aff97/llms.txt): $0.001/call via x402. Retrieves a decision-ready verdict on whether a published on-chain obligation has been satisfied, returning allow/review/block signals for autonomous agent decision gates.
- [Tereno Web Compile — URL to LLM-Ready Markdown](https://www.zero.xyz/c/tereno-web-compile-url-to-llm-ready-markdown-9119602b/llms.txt): $0.03/call via x402. Fetches a public web page and converts it into clean, bounded, LLM-ready Markdown with links and metadata, paid via x402 micropayment
- [Tereno Token Metadata Lookup](https://www.zero.xyz/c/tereno-token-metadata-lookup-25274bab/llms.txt): $0.03/call via x402. Fetches ERC-20 token metadata (name, symbol, decimals, totalSupply) for a Base chain contract address and returns a decision-ready verdict on its readability.
- [Tereno Transaction Preflight Verdict](https://www.zero.xyz/c/tereno-transaction-preflight-verdict-6a69d0b8/llms.txt): $0.25/call via x402. Runs a preflight risk check on a blockchain transaction (from/to/value/data) and returns a decision-ready allow/review/block verdict with supporting evidence.
- [Tereno Evidence Artifact Lookup](https://www.zero.xyz/c/tereno-evidence-artifact-lookup-ab7d93d0/llms.txt): $0.01/call via x402. Retrieves a cached, reusable artifact by its SHA-256 ID, returning structured evidence fields, freshness metadata, and a decision-ready verdict.
- [Tereno Transaction Intent Guard](https://www.zero.xyz/c/tereno-transaction-intent-guard-af29989b/llms.txt): $0.25/call via x402. Analyzes a blockchain transaction's intent and returns a decision-ready verdict (allow/block/warn) with risk assessment, simulation results, and allowance change detection
- [Tereno Contract Upgrade Window Claim](https://www.zero.xyz/c/tereno-contract-upgrade-window-claim-08c4c8da/llms.txt): $0.25/call via x402. Publishes a verifiable, challengeable claim that a Base proxy contract's implementation slot did not change during a specified block window

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)