# Services from www.tereno.xyz on Zero > www.tereno.xyz serves 17 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/www.tereno.xyz Live health (JSON, refreshed every minute): https://www.zero.xyz/host/www.tereno.xyz/health.json ## Services - [Tereno Transaction Intent Guard](https://www.zero.xyz/c/tereno-transaction-intent-guard-cd58bde9/llms.txt): $0.25/call via x402. Simulates an unsigned Base transaction against live chain state and returns a safety verdict (allow/review/block) with reason codes, balance/allowance changes, gas estimate, and approval risk flags. - [Tereno Aerodrome Swap Guard](https://www.zero.xyz/c/tereno-aerodrome-swap-guard-48c554b7/llms.txt): $0.25/call via x402. Simulates a prepared Aerodrome swap calldata against the Base blockchain to verify whether the encoded slippage/limit will be satisfied under current chain state. - [Tereno Contract Change Monitor](https://www.zero.xyz/c/tereno-contract-change-monitor-de8f09d6/llms.txt): $0.02/call via x402. Detects whether a Base smart contract has changed since Tereno last observed it, flagging proxy upgrades, admin takeovers, bytecode swaps, or newly paused states. - [Tereno Contract Interface Detector](https://www.zero.xyz/c/tereno-contract-interface-detector-649cf37f/llms.txt): $0.02/call via x402. Detects which ERC/EIP standards (ERC-20, ERC-721, ERC-1155, ERC-165, EIP-1967 proxy) a Base blockchain contract implements, with caching shared across agents. - [Tereno Morpho Collateral Guard](https://www.zero.xyz/c/tereno-morpho-collateral-guard-5f27bf0a/llms.txt): $0.75/call via x402. Simulates a proposed Morpho borrow or leverage action to determine if it will breach liquidation thresholds, evaluating health factor buffer and oracle freshness before execution. - [Tereno Obligation Verdict](https://www.zero.xyz/c/tereno-obligation-verdict-1a6a5a12/llms.txt): $0.001/call via x402. Recomputes and returns the verdict on a published Tereno economic obligation, indicating whether the condition was satisfied, along with receipt bytes, challenge count, and inputs to independently verify the result. - [Tereno RWA Market Guard](https://www.zero.xyz/c/tereno-rwa-market-guard-c091488a/llms.txt): $0.5/call via x402. Evaluates whether a tokenized RWA or stock token is tradeable right now by checking TradFi market hours, oracle freshness, and on-chain contract pause states for EVM and Robinhood Chain. - [Tereno Token Launch Guard](https://www.zero.xyz/c/tereno-token-launch-guard-67b6e931/llms.txt): $0.07/call via x402. Simulates a real sell of a funded balance for a freshly launched Base token, detects mint/blacklist/pause/fee powers in its bytecode, and returns a verdict on whether you can exit your position. - [Tereno Token Metadata](https://www.zero.xyz/c/tereno-token-metadata-1e89b4ef/llms.txt): $0.03/call via x402. Reads a Base network ERC-20 token's name, symbol, decimals, and total supply from a contract address in a single cached call. - [Tereno Uniswap V4 Hook Guard](https://www.zero.xyz/c/tereno-uniswap-v4-hook-guard-0e68ae25/llms.txt): $0.54/call via x402. Inspects Uniswap V4 pool hook permission flags and verifies contract deployment safety before swap execution - [Tereno Webpage to Markdown](https://www.zero.xyz/c/tereno-webpage-to-markdown-422dc379/llms.txt): $0.03/call via x402. Converts a public web page URL into clean, LLM-ready Markdown with resolved links, citations, a SHA-256 content hash, and an x402 payment receipt - [Tereno x402 Endpoint Assurance](https://www.zero.xyz/c/tereno-x402-endpoint-assurance-fc2ae536/llms.txt): $0.03/call via x402. Probe and validate a third-party x402 endpoint's 402 challenge conformance, schema quality, availability history, and field-level changes since last observation without paying it. - [Tereno Proxy Claim Publisher](https://www.zero.xyz/c/tereno-proxy-claim-publisher-f9503939/llms.txt): $0.25/call via x402. Publishes a deterministic, on-chain claim that a Base proxy contract's implementation slot held a specific address across a specified block range, funded with a USDC reward for anyone who can disprove it. - [Tereno Base Chain Snapshot](https://www.zero.xyz/c/tereno-base-chain-snapshot-e51b040c/llms.txt): $0.005/call via x402. Returns the current Base blockchain state — block number, timestamp, base fee, and suggested gas fees — in a single no-parameter call. - [Tereno Contract Guard](https://www.zero.xyz/c/tereno-contract-guard-5ceadaf5/llms.txt): $0.1/call via x402. Returns an allow, review, or block verdict for a Base smart contract by running bounded code, proxy, and pause safety checks with evidence and freshness metadata. - [Tereno Trade Execution Notarize](https://www.zero.xyz/c/tereno-trade-execution-notarize-191e6e42/llms.txt): $0.05/call via x402. Audits and notarizes a completed DEX trade on Base by decoding token deltas, verifying pool state, and certifying clean execution free of dynamic fee gouging. - [Tereno Evidence Artifact](https://www.zero.xyz/c/tereno-evidence-artifact-5c72cb23/llms.txt): $0.01/call via x402. Retrieves or recomputes a provenance envelope for a public Tereno artifact, returning its source capability, field paths, validity window, and exact recomputation inputs. 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)