# Services from api.jagent.dev on Zero

> api.jagent.dev serves 20 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.jagent.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.jagent.dev/health.json

## Services

- [Base Gas Oracle](https://www.zero.xyz/c/base-gas-oracle-704733b0/llms.txt): $0.005/call via x402. Returns real-time Base mainnet gas fee estimates with USD cost breakdowns for common transaction types, using live ETH price from Uniswap v3
- [Base Token Risk Check](https://www.zero.xyz/c/base-token-risk-check-0cb293c5/llms.txt): $0.008/call via x402. Performs a live heuristic risk assessment of a token contract address on Base mainnet, returning risk level, token metadata, ownership, proxy status, and bytecode-level red flags.
- [Base Token Verdict](https://www.zero.xyz/c/base-token-verdict-92b250be/llms.txt): $0.01/call via x402. Returns an AI-generated plain-English risk verdict (low_risk, caution, high_risk, or insufficient_data) for a given ERC-20 token contract on the Base blockchain, including a summary and key risk points.
- [Base Wallet Profile](https://www.zero.xyz/c/base-wallet-profile-27359694/llms.txt): $0.008/call via x402. Returns live wallet profile for a Base mainnet address, including account kind, nonce, ETH balance, and balances of 7 major tokens (USDC, USDbC, WETH, DAI, cbETH, cbBTC, AERO)
- [Base Wallet Summary](https://www.zero.xyz/c/base-wallet-summary-4cd4b3d8/llms.txt): $0.01/call via x402. Returns an AI-generated plain-English profile of a Base blockchain address, including onchain data, a classification label, key points, and warnings.
- [Cron Expression Validator & Next Run Time Calculator](https://www.zero.xyz/c/cron-expression-validator-next-run-time-calculator-6c8ba4ab/llms.txt): $0.001/call via x402. Validates a 5-field cron expression and returns its next scheduled run times in UTC ISO format
- [CSV to JSON Converter](https://www.zero.xyz/c/csv-to-json-converter-d589449d/llms.txt): $0.005/call via x402. Converts CSV text to JSON, returning an array of objects (with headers) or array of arrays (without), with optional type inference and delimiter configuration.
- [EIP-712 Signature Check](https://www.zero.xyz/c/eip-712-signature-check-968896ac/llms.txt): $0.005/call via x402. Pre-sign risk analysis of EIP-712 typed data messages, detecting dangerous approvals, transfers, and missing safeguards before signing
- [EVM Calldata Decoder](https://www.zero.xyz/c/evm-calldata-decoder-0f047bcd/llms.txt): $0.003/call via x402. Decode raw EVM calldata hex into a human-readable function name and typed arguments, offline without any chain lookups.
- [EVM Event Log Decoder](https://www.zero.xyz/c/evm-event-log-decoder-2d62602d/llms.txt): $0.003/call via x402. Decodes raw EVM event logs (topics + data) into named, typed arguments offline, recognizing common token, NFT, and AMM events without chain lookups
- [EVM Keccak and Checksum](https://www.zero.xyz/c/evm-keccak-and-checksum-0a95c5a0/llms.txt): $0.002/call via x402. Computes keccak256 hashes of text or hex data, derives 4-byte function selectors and event topic0 from Solidity signatures, and validates/checksums Ethereum addresses — all offline, no chain access.
- [EVM Tx Safety Check](https://www.zero.xyz/c/evm-tx-safety-check-f75b263c/llms.txt): $0.005/call via x402. Pre-sign offline risk assessment of EVM transaction calldata, flagging dangerous patterns like unlimited approvals, permit calls, and ownership changes
- [Hash / HMAC String (MD5, SHA-1, SHA-256, SHA-3 and more)](https://www.zero.xyz/c/hash-hmac-string-md5-sha-1-sha-256-sha-3-and-more-27426d9a/llms.txt): $0.001/call via x402. Computes cryptographic hash digests (or HMAC) of a string using one or more algorithms, returning hex and base64 encodings of the result.
- [JSON Schema Validate](https://www.zero.xyz/c/json-schema-validate-99d24fc9/llms.txt): $0.001/call via x402. Validates arbitrary JSON data against a JSON Schema definition and returns detailed validation errors with JSON-pointer paths
- [JSON to CSV Converter](https://www.zero.xyz/c/json-to-csv-converter-cf483782/llms.txt): $0.001/call via x402. Converts an array of JSON objects into a RFC 4180-compliant CSV string, with options for column ordering, delimiter, flattening, and line endings.
- [JWT Inspect – Decode and Verify JWTs](https://www.zero.xyz/c/jwt-inspect-decode-and-verify-jwts-d1987f7b/llms.txt): $0.001/call via x402. Decodes and optionally cryptographically verifies a JWS-compact JWT, returning parsed header, payload, claims analysis, and signature validity.
- [Markdown to HTML Converter](https://www.zero.xyz/c/markdown-to-html-converter-5f84d6e0/llms.txt): $0.001/call via x402. Converts a Markdown string to HTML, returning rendered HTML, a headings outline, and input character count
- [JavaScript Regex Tester](https://www.zero.xyz/c/javascript-regex-tester-7eab938c/llms.txt): $0.001/call via x402. Tests a JavaScript regular expression against input text, returning match details, groups, and optional string replacement results
- [Text Diff (Line-Based)](https://www.zero.xyz/c/text-diff-line-based-6103091d/llms.txt): $0.001/call via x402. Computes a line-based unified diff between two text strings, returning added/removed/unchanged line counts, hunk count, and a unified diff string.
- [Time Zone Converter API](https://www.zero.xyz/c/time-zone-converter-api-e5c63bb2/llms.txt): $0.001/call via x402. Converts a time value between IANA timezones, optionally adding a duration offset and computing a diff to a reference time.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

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