# Services from api.salt19.com on Zero

> api.salt19.com serves 26 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/api.salt19.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.salt19.com/health.json

## Services

- [SALT19 Agent Plan Verifier](https://www.zero.xyz/c/salt19-agent-plan-verifier-2b605db2/llms.txt): $0.72/call via x402. Validates an AI agent's step-by-step plan against a goal and optional constraints, returning a verdict, score, and itemized issues such as unsafe steps, ordering errors, and constraint violations.
- [SALT19 URL to LLM Markdown Converter](https://www.zero.xyz/c/salt19-url-to-llm-markdown-converter-9688fcb0/llms.txt): $0.01/call via x402. Fetches a web page by URL and converts its content to clean LLM-ready Markdown, with optional character truncation.
- [SALT19 Model Memory Fit Calculator](https://www.zero.xyz/c/salt19-model-memory-fit-calculator-c8dff1e4/llms.txt): $0.05/call via x402. Estimates whether an LLM model will fit in a given VRAM budget, returning a FIT/NO-FIT verdict with estimated memory breakdown and headroom.
- [SALT19 Dependency Go/No-Go Checker](https://www.zero.xyz/c/salt19-dependency-go-no-go-checker-9a442348/llms.txt): $0.2/call via x402. Evaluates an npm/software package and version against vulnerability, license, and activity policies and returns a GO or NO-GO verdict with supporting evidence.
- [SALT19 Dependency Upgrade Go/No-Go Decision Engine](https://www.zero.xyz/c/salt19-dependency-upgrade-go-no-go-decision-engine-d4ce3cf7/llms.txt): $0.16/call via x402. Analyzes a proposed package version upgrade and returns a scored go/no-go verdict covering breaking changes, security implications, runtime compatibility, and peer dependency conflicts.
- [SALT19 Agent Claim Output Verifier](https://www.zero.xyz/c/salt19-agent-claim-output-verifier-07a6bd18/llms.txt): $0.45/call via x402. Verifies whether an agent-generated claim is supported, partially supported, or contradicted by a given set of evidence, returning a structured verdict with confidence score and breakdown.
- [SALT19 npm Package Intelligence](https://www.zero.xyz/c/salt19-npm-package-intelligence-91d880f9/llms.txt): $0.03/call via x402. Looks up npm package metadata including license, version, deprecation status, publication date, and vulnerability count for a given package name and optional version.
- [SALT19 Repo Adoption Go/No-Go Evaluator](https://www.zero.xyz/c/salt19-repo-adoption-go-no-go-evaluator-af6ae713/llms.txt): $0.32/call via x402. Analyzes a GitHub repository and returns a scored go/no-go adoption verdict covering maintenance, license, compatibility, and security indicators
- [SALT19 GitHub Repo Preflight Check](https://www.zero.xyz/c/salt19-github-repo-preflight-check-bcce56a0/llms.txt): $0.09/call via x402. Fetches key health and risk metadata for a GitHub repository, including license, archive status, open issues, and push recency
- [SALT19 Agent Code Change Risk Gate](https://www.zero.xyz/c/salt19-agent-code-change-risk-gate-b1631468/llms.txt): $1.21/call via x402. Analyzes a code diff and returns a risk verdict, rollback risk, breaking change probability, security flags, and test requirements before deployment.
- [SALT19 URL HTTP Preflight Check](https://www.zero.xyz/c/salt19-url-http-preflight-check-ccff518d/llms.txt): $0.03/call via x402. Performs an HTTP preflight check on a given URL, returning final resolved URL, redirect count, latency, content type, and security header presence
- [SALT19 Agent Decision Preflight](https://www.zero.xyz/c/salt19-agent-decision-preflight-2d9c172e/llms.txt): $0.45/call via x402. Performs a pre-flight safety and compliance check on an npm package or GitHub repository, returning a GO/NO-GO verdict with vulnerability data and a signed evidence receipt.
- [SALT19 USGS Earthquake Feed](https://www.zero.xyz/c/salt19-usgs-earthquake-feed-78f5a940/llms.txt): $0.01/call via x402. Retrieves recent USGS earthquake events filtered by time window, count limit, and minimum magnitude
- [SALT19 NPM Package Facts](https://www.zero.xyz/c/salt19-npm-package-facts-5422104d/llms.txt): $0.01/call via x402. Retrieves key metadata facts about an NPM package — including license, version, and deprecation status — for a given package name and optional version.
- [SALT19 Agent Utility Grid – Base Token Balance Lookup](https://www.zero.xyz/c/salt19-agent-utility-grid-base-token-balance-lookup-6c5481f6/llms.txt): $0.01/call via x402. Returns the on-chain ERC-20 token balance for a given wallet address and token contract at the latest block.
- [SALT19 NWS Active Alerts](https://www.zero.xyz/c/salt19-nws-active-alerts-74721bd7/llms.txt): $0.01/call via x402. Fetches active National Weather Service alerts for a given US state or territory, returning current severe weather warnings and watches.
- [SALT19 SEC Company Facts](https://www.zero.xyz/c/salt19-sec-company-facts-47aaaac2/llms.txt): $0.01/call via x402. Retrieves SEC EDGAR financial facts (e.g. Assets, Revenue) for a public company by CIK and requested concepts
- [SALT19 Commerce Decision Engine](https://www.zero.xyz/c/salt19-commerce-decision-engine-019414e6/llms.txt): $0.01/call via x402. Evaluates a payment request against a spending policy and returns a GO/NO-GO decision with a selected payment offer for x402-style micropayments
- [SALT19 GitHub Repo Facts](https://www.zero.xyz/c/salt19-github-repo-facts-b17aefda/llms.txt): $0.01/call via x402. Fetches key metadata facts about a GitHub repository, including license, archive status, default branch, and more.
- [SALT19 Commerce Receipt Verifier](https://www.zero.xyz/c/salt19-commerce-receipt-verifier-80020292/llms.txt): $0.04/call via x402. Verifies and issues a cryptographically signed receipt for an x402 micropayment transaction, confirming payment settlement and delivery against policy constraints.
- [SALT19 SEC Recent Filings](https://www.zero.xyz/c/salt19-sec-recent-filings-9df4062c/llms.txt): $0.01/call via x402. Retrieves the most recent SEC regulatory filings for a given company by CIK number
- [SALT19 Commerce Verify](https://www.zero.xyz/c/salt19-commerce-verify-9348cbba/llms.txt): $0.02/call via x402. Validates x402 payment-bound commerce transactions by checking policy compliance, payment payload integrity, and delivery binding for agent-initiated purchases.
- [SALT19 Base Token Allowance Lookup](https://www.zero.xyz/c/salt19-base-token-allowance-lookup-c6f3f250/llms.txt): $0.01/call via x402. Returns the current ERC-20 token allowance granted by an owner address to a spender address on the Base network
- [SALT19 Base Wallet Balance Lookup](https://www.zero.xyz/c/salt19-base-wallet-balance-lookup-319f8e31/llms.txt): $0.01/call via x402. Returns the native ETH balance (in ETH and Wei) of a given Ethereum address on the Base network (chain ID 8453)
- [SALT19 Base Contract State Lookup](https://www.zero.xyz/c/salt19-base-contract-state-lookup-ba0cc7d7/llms.txt): $0.01/call via x402. Retrieves the base on-chain state of an Ethereum address, including whether it is a contract, its bytecode size, and current block context.
- [SALT19 Base Transaction Status](https://www.zero.xyz/c/salt19-base-transaction-status-aae8d3d8/llms.txt): $0.01/call via x402. Looks up the on-chain status of a Base (EVM) transaction by its hash, returning state, network, gas used, and block number

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)