# Services from base-agent-preflight.bytoken2023.workers.dev on Zero

> base-agent-preflight.bytoken2023.workers.dev serves 115 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/base-agent-preflight.bytoken2023.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/base-agent-preflight.bytoken2023.workers.dev/health.json

## Services

- [Base Contract Verification](https://www.zero.xyz/c/base-contract-verification-7f62a0bb/llms.txt): $0.005/call via x402. Verifies a Base (EVM) smart contract address and returns risk assessment, flags, and provenance metadata
- [PyPI Package Preflight Check](https://www.zero.xyz/c/pypi-package-preflight-check-1a2ff108/llms.txt): $0.005/call via x402. Checks a PyPI package's metadata, release age, yanked status, Python requirements, dependencies, license, and known OSV vulnerabilities.
- [Base Merchant Trust Assessment](https://www.zero.xyz/c/base-merchant-trust-assessment-bcb32674/llms.txt): $0.1/call via x402. Evaluates the trustworthiness and risk profile of a Base blockchain merchant address before making payments
- [Base Transaction Calldata Preflight Inspector](https://www.zero.xyz/c/base-transaction-calldata-preflight-inspector-4c5ff26a/llms.txt): $0.005/call via x402. Decodes and analyzes EVM calldata for a Base transaction before signing, flagging token transfers, approvals, unlimited spending allowances, and unknown function selectors.
- [x402 Payment Guard Preflight Evaluator](https://www.zero.xyz/c/x402-payment-guard-preflight-evaluator-b7b79b72/llms.txt): $0.1/call via x402. Evaluates an x402 payment URL before autonomous spending — enforcing budgets, scoring merchant/domain risk, detecting replay, and requiring human approval when needed.
- [Base Payment Proof Verifier](https://www.zero.xyz/c/base-payment-proof-verifier-cddae9ee/llms.txt): $0.03/call via x402. Verifies and risk-assesses a Base blockchain USDC payment transaction by checking its hash, recipient, and amount on-chain.
- [Domain Trust Preflight Check](https://www.zero.xyz/c/domain-trust-preflight-check-6452162b/llms.txt): $0.015/call via x402. Inspects a domain's DNS, DNSSEC, mail records, CNAME chains, RDAP registration age/expiration, and trust signals to assess domain safety before interaction.
- [NPM Package Preflight Safety Check](https://www.zero.xyz/c/npm-package-preflight-safety-check-ef75a1fa/llms.txt): $0.015/call via x402. Analyzes an npm package for security risk, flags, provenance, and metadata to help agents safely evaluate packages before installation or use.
- [Base Address Preflight Safety Check](https://www.zero.xyz/c/base-address-preflight-safety-check-3b5e3fc7/llms.txt): $0.075/call via x402. Inspects a Base (EIP-155:8453) wallet address for risk signals, flags, and activity before an autonomous payment is made
- [A2A Agent Card Preflight Validator](https://www.zero.xyz/c/a2a-agent-card-preflight-validator-f1c6be8f/llms.txt): $0.02/call via x402. Discovers and validates a public A2A Agent Card, checking its skills, provider identity, authentication declarations, endpoint consistency, and unsafe URLs.
- [Base ERC-20 Approval Risk Checker](https://www.zero.xyz/c/base-erc-20-approval-risk-checker-3f037c11/llms.txt): $0.005/call via x402. Assesses the risk level of an ERC-20 token approval on Base by analyzing the owner, spender, and token contract addresses.
- [GitHub Repository Health Check](https://www.zero.xyz/c/github-repository-health-check-2a047b99/llms.txt): $0.02/call via x402. Assesses a public GitHub repository's health, activity, identity, and risk level, returning a structured safety assessment with risk score and flags.
- [Base ERC-20 Token Preflight Check](https://www.zero.xyz/c/base-erc-20-token-preflight-check-1a9843fa/llms.txt): $0.075/call via x402. Inspects a Base network ERC-20 token contract address and returns a safety assessment including risk score, risk level, and flags covering identity, activity, provenance, and product metadata.
- [Base Event Log Monitor](https://www.zero.xyz/c/base-event-log-monitor-ad74dffe/llms.txt): $0.003/call via x402. Monitors and retrieves emitted event logs from a given Base (EVM) address starting from a specified block, with risk scoring and flag assessment.
- [OpenAPI Preflight Validator](https://www.zero.xyz/c/openapi-preflight-validator-4fdd5912/llms.txt): $0.015/call via x402. Validates a public OpenAPI JSON or YAML document for server URLs, authentication declarations, operation coverage, and content fingerprint.
- [x402 Endpoint Preflight Inspector](https://www.zero.xyz/c/x402-endpoint-preflight-inspector-0720e55a/llms.txt): $0.015/call via x402. Inspects a public HTTP/HTTPS x402-payment-gated URL and returns risk assessment, network metadata, and safety flags without actually paying the endpoint's fee.
- [Base Nonce Readiness Check](https://www.zero.xyz/c/base-nonce-readiness-check-331a3804/llms.txt): $0.003/call via x402. Checks and assesses the transaction nonce readiness and risk level for a Base blockchain account address
- [Base DEX Market Monitor](https://www.zero.xyz/c/base-dex-market-monitor-405f280c/llms.txt): $0.005/call via x402. Monitors a Base network token contract across DEX trading pairs, returning market activity data and a risk assessment with flags and risk score.
- [Base Agent Preflight – RSS/Atom Feed Snapshot](https://www.zero.xyz/c/base-agent-preflight-rss-atom-feed-snapshot-17909cc3/llms.txt): $0.003/call via x402. Fetches a public RSS or Atom feed URL and returns a structured safety snapshot with risk scoring and flags for autonomous agents.
- [Base Gas Fee Quote](https://www.zero.xyz/c/base-gas-fee-quote-d7d14726/llms.txt): $0.003/call via x402. Returns a current gas fee quote for a given transaction gas limit on the Base (EIP-155:8453) network, including risk assessment flags and risk score.
- [Nomos Crypto-to-Fiat Value Converter](https://www.zero.xyz/c/nomos-crypto-to-fiat-value-converter-d60c9314/llms.txt): $0.005/call via x402. Converts a specified amount of BTC, ETH, TRX, USDT, or USDC into its equivalent USD or TWD fiat value for agent budget checks and cost calculations.
- [Base Wallet Activity Delta](https://www.zero.xyz/c/base-wallet-activity-delta-598c4ec9/llms.txt): $0.03/call via x402. Returns recent transfer activity and risk assessment for a Base wallet address since a specified timestamp
- [Base Wallet Counterparty Risk Analyzer](https://www.zero.xyz/c/base-wallet-counterparty-risk-analyzer-54337ec7/llms.txt): $0.02/call via x402. Analyzes a Base blockchain wallet or contract address for risk level, flags, and counterparty safety before transacting
- [URL Change Fingerprint](https://www.zero.xyz/c/url-change-fingerprint-68849f3f/llms.txt): $0.003/call via x402. Generates a change-detection fingerprint for a public HTTP(S) URL to assess whether its content has been altered, along with a risk score and flags.
- [Base USDC Receipt Lookup & Risk Assessment](https://www.zero.xyz/c/base-usdc-receipt-lookup-risk-assessment-c5e06ef0/llms.txt): $0.003/call via x402. Fetches a structured receipt for a Base chain USDC transaction, including risk scoring, activity details, and provenance assessment.
- [Base Stablecoin Balance Checker](https://www.zero.xyz/c/base-stablecoin-balance-checker-62f79c4d/llms.txt): $0.003/call via x402. Fetches and risk-assesses stablecoin balances held by a given Base (EVM) wallet or contract address, returning balances, risk score, and safety flags.
- [Kalshi Prediction Market Snapshot](https://www.zero.xyz/c/kalshi-prediction-market-snapshot-1a0b12be/llms.txt): $0.005/call via x402. Fetches a machine-readable risk and activity snapshot for a Kalshi prediction market ticker, including risk score and flags.
- [Nomos Wallet Labels API](https://www.zero.xyz/c/nomos-wallet-labels-api-0912fab2/llms.txt): $0.01/call via x402. Returns identity labels, risk scores, and flags for a blockchain wallet address on Ethereum, Tron, or Bitcoin.
- [Nomos Wallet Watchlist Risk Screening](https://www.zero.xyz/c/nomos-wallet-watchlist-risk-screening-68968987/llms.txt): $0.02/call via x402. Screens a blockchain wallet address for risk flags, risk score, and risk level across Ethereum, Tron, or Bitcoin networks
- [Nomos Counterparty Intelligence API](https://www.zero.xyz/c/nomos-counterparty-intelligence-api-d1318a66/llms.txt): $0.5/call via x402. Returns identity, risk score, and behavioral summary for a wallet address based on its on-chain counterparty activity over a specified lookback window.
- [Base Alpha Risk Scorer — Wallet & Token Risk Assessment](https://www.zero.xyz/c/base-alpha-risk-scorer-wallet-token-risk-assessment-d02b84eb/llms.txt): $0.003/call via x402. Scores a Base network wallet or ERC-20 token address for risk level, alpha potential, and trade bias using on-chain analysis
- [Nomos ETH/USD Value Assessment API](https://www.zero.xyz/c/nomos-eth-usd-value-assessment-api-d9b4be8c/llms.txt): $0.002/call via x402. Returns the current ETH/USD exchange rate with associated risk assessment, network metadata, and risk scoring via a pay-per-request preflight API.
- [Nomos Merchant Risk & Policy Check](https://www.zero.xyz/c/nomos-merchant-risk-policy-check-88f94ea0/llms.txt): $0.05/call via x402. Evaluates a merchant's identity, risk level, and authorization policy before an autonomous agent executes a payment or transaction on its behalf.
- [Nomos Payment Preflight Decision API](https://www.zero.xyz/c/nomos-payment-preflight-decision-api-04197ae6/llms.txt): $0.2/call via x402. Evaluates an autonomous agent's proposed USDC payment before execution, returning a risk score, risk level, and any compliance flags.
- [Base Wallet Copy-Trade Risk Scorer](https://www.zero.xyz/c/base-wallet-copy-trade-risk-scorer-98fe0e06/llms.txt): $0.003/call via x402. Evaluates the risk level of a Base network wallet address before copy-trading, returning a risk score, risk level, and any associated flags.
- [Nomos MCP Server Risk Check](https://www.zero.xyz/c/nomos-mcp-server-risk-check-129cc1a6/llms.txt): $0.02/call via x402. Performs a risk assessment on a given MCP server URL, returning a risk score, risk level, and any flags indicating suspicious or dangerous behavior.
- [Nomos Wallet Risk 360](https://www.zero.xyz/c/nomos-wallet-risk-360-420fd5c6/llms.txt): $0.1/call via x402. Returns a comprehensive 360-degree risk assessment for a blockchain wallet address, including risk score, risk level, flags, identity, and activity signals.
- [Agent Buyer Identity Preflight | x402 Purchase Governance](https://www.zero.xyz/c/agent-buyer-identity-preflight-x402-purchase-governance-ca1fec2b/llms.txt): $0.05/call via x402. Verifies whether an AI agent's buyer role, status, and approval policy are compatible with a target x402 product category, price, and data sensitivity before purchase.
- [Nomos Wallet Risk Lite](https://www.zero.xyz/c/nomos-wallet-risk-lite-be411e85/llms.txt): $0.04/call via x402. Screens a blockchain wallet address for risk signals and returns a risk score, risk level, and flags for autonomous agent preflight checks.
- [Nomos Agent Action Preflight Check](https://www.zero.xyz/c/nomos-agent-action-preflight-check-5731d79d/llms.txt): $0.01/call via x402. Evaluates an agent's proposed action (tool call, shell command, wallet operation, etc.) for identity, risk, and authorization before execution.
- [Nomos Source of Funds Quick Assessment](https://www.zero.xyz/c/nomos-source-of-funds-quick-assessment-9ab1c6d4/llms.txt): $0.25/call via x402. Returns a rapid risk assessment and source-of-funds summary for an EVM wallet address on Ethereum or Base, covering activity, identity signals, and risk score.
- [Nomos Budget Check API](https://www.zero.xyz/c/nomos-budget-check-api-b395ebe8/llms.txt): $0.02/call via x402. Validates whether an autonomous agent has sufficient budget and authorization to proceed with a requested spend, returning a risk assessment and approval decision.
- [Agent Payment Guard — x402 Server Trust Assessment](https://www.zero.xyz/c/agent-payment-guard-x402-server-trust-assessment-e902c36d/llms.txt): $0.01/call via x402. Returns a risk score, risk level, and flags for a given x402 payment server URL to help AI agents decide whether to trust and pay it.
- [Nomos Wallet Identity & Risk API](https://www.zero.xyz/c/nomos-wallet-identity-risk-api-e245267c/llms.txt): $0.01/call via x402. Identifies a blockchain wallet address and returns its risk score, risk level, activity profile, and identity metadata for agent pre-flight decision-making.
- [BlockchainSecurity Address Labels Lookup](https://www.zero.xyz/c/blockchainsecurity-address-labels-lookup-951167d7/llms.txt): $0.02/call via x402. Retrieves risk labels and classification data for a blockchain address on a specified chain via the BlockchainSecurity Atlantis upstream service.
- [Nomos BTC/USD Value API](https://www.zero.xyz/c/nomos-btc-usd-value-api-b796d421/llms.txt): $0.002/call via x402. Returns the current BTC/USD price along with a risk assessment and flags for a given BTC amount.
- [SignGate Token Risk Screener for AI Agents](https://www.zero.xyz/c/signgate-token-risk-screener-for-ai-agents-4b50dc1e/llms.txt): $0.01/call via x402. Screens a token contract address on a specified chain for risk level, flags, and risk score before an AI agent proceeds with a transaction.
- [Wallet Address Risk Lookup for EVM/ETH Chains](https://www.zero.xyz/c/wallet-address-risk-lookup-for-evm-eth-chains-a9a9b669/llms.txt): $0.1/call via x402. Looks up the risk score, risk level, and sanction/fraud labels for an Ethereum wallet or contract address on the ETH/EVM chain.
- [Nomos TRX/USD Value Assessment](https://www.zero.xyz/c/nomos-trx-usd-value-assessment-fdd7e590/llms.txt): $0.001/call via x402. Returns a risk assessment and value lookup for a given TRX (Tron) amount in USD terms, including risk score and flags for autonomous agent preflight checks.
- [Nomos Execution Environment Preflight API](https://www.zero.xyz/c/nomos-execution-environment-preflight-api-c4027a05/llms.txt): $2/call via x402. Assesses the risk level and flags of a code execution action within a specified environment before an autonomous agent proceeds with execution.
- [SignGate Agent Buyer Identity Preflight | x402 Purchase Governance](https://www.zero.xyz/c/signgate-agent-buyer-identity-preflight-x402-purchase-governance-b9821757/llms.txt): $0.15/call via x402. Performs a pre-payment risk assessment for AI agents about to make an x402 USDC payment, checking buyer identity, amount limits, recipient allowlists/blocklists, and approval policies before authorizing the transaction.
- [Nomos Tool Access Decision API](https://www.zero.xyz/c/nomos-tool-access-decision-api-d369af97/llms.txt): $0.03/call via x402. Performs a preflight risk and authorization assessment for an agent attempting to use a specific tool, returning a risk score and flags before execution.
- [SignGate Agent Buyer Identity Preflight – x402 Purchase Governance](https://www.zero.xyz/c/signgate-agent-buyer-identity-preflight-x402-purchase-governance-01133ef9/llms.txt): $0.1/call via x402. Evaluates whether an AI agent's buyer identity, role, and risk profile are authorized to purchase a specific x402-gated API, dataset, or tool before 

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