# Services from market.561.group on Zero

> market.561.group serves 14 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/market.561.group
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/market.561.group/health.json

## Services

- [561 Group Astronomy Positions](https://www.zero.xyz/c/561-group-astronomy-positions-37d7f593/llms.txt): $0.04/call via x402. Returns apparent geocentric ecliptic longitude, latitude, and angular speed for celestial bodies at a given UTC instant, with lunar illumination, computation provenance, and error bounds.
- [Base Chain ETH Balance](https://www.zero.xyz/c/base-chain-eth-balance-c594055d/llms.txt): $0.001/call via x402. Returns the live native ETH balance (in wei) for a given Base network address, along with the snapshot block number at which it was read.
- [Base Chain Gas Oracle](https://www.zero.xyz/c/base-chain-gas-oracle-19847781/llms.txt): $0.001/call via x402. Returns the current gas price on the Base network in both wei and gwei, along with the block number at which it was read, fetched live from a public Base RPC node via eth_gasPrice.
- [market.561.group Chinese-to-English Translation](https://www.zero.xyz/c/market-561-group-chinese-to-english-translation-e1ace743/llms.txt): $0.01/call via x402. Translates Mandarin Chinese (Simplified or Traditional) text and SRT/WebVTT subtitle files into natural American English, preserving timings, names, numbers, and glossary terms.
- [book-record](https://www.zero.xyz/c/book-record-9961b750/llms.txt): $0.002/call via x402. Validates an ISBN-10 or ISBN-13 checksum and returns a unified CSL-JSON book record sourced from Open Library (edition, work, and author data)
- [Chinese Short Drama (Duanju) Subtitle Translator — ZH to EN](https://www.zero.xyz/c/chinese-short-drama-duanju-subtitle-translator-zh-to-en-2cbc5e2e/llms.txt): $0.01/call via x402. Translates Mandarin SRT or WebVTT subtitle files from Chinese short dramas into natural, fan-friendly English, preserving cue numbers and timings while rendering trope terms, titles, and names consistently.
- [561 Group Ephemeris Moment](https://www.zero.xyz/c/561-group-ephemeris-moment-98a2ad98/llms.txt): $0.04/call via x402. Returns deterministic apparent tropical planetary positions, signs, motion, lunar phase, aspects, provenance, and audited error bounds for a given UTC instant.
- [orphan-patch-score](https://www.zero.xyz/c/orphan-patch-score-457afa12/llms.txt): $0.02/call via x402. Ranks open-source packages as orphan-patch candidates by scoring them on disclosed advisories, maintainer silence, and dependent count using only public, deterministic inputs.
- [561-Group Pacing Analysis](https://www.zero.xyz/c/561-group-pacing-analysis-2b78331c/llms.txt): $0.05/call via x402. Analyzes caller-submitted biometric observations to produce a full pacing report including rolling baselines, morning deviation, resting-heart-rate threshold estimate, and PEM risk flag for ME/CFS energy management.
- [Trashpanda Pre-Sign Conformance Check](https://www.zero.xyz/c/trashpanda-pre-sign-conformance-check-4f0a9f17/llms.txt): $0.03/call via x402. Deterministically evaluates one unsigned Base transaction against the buyer's policy and block anchor, returning a clause-by-clause PASS, FAIL, or ESCALATE verdict before signing
- [cdrama-episode-en-zh](https://www.zero.xyz/c/cdrama-episode-en-zh-817044fd/llms.txt): $0.01/call via x402. Translates Chinese drama subtitle files from English to Mandarin Chinese (or reverse), preserving subtitle cue IDs and timing, with series-level terminology consistency via a private series key.
- [561 Group Heart-Rate Threshold](https://www.zero.xyz/c/561-group-heart-rate-threshold-3936278c/llms.txt): $0.01/call via x402. Computes the Workwell Foundation resting-heart-rate+15bpm pacing ceiling heuristic to determine a safe heart-rate threshold for pacing, labeled as an unvalidated clinical rule of thumb.
- [Trashpanda Market Action Admission](https://www.zero.xyz/c/trashpanda-market-action-admission-c4a2da99/llms.txt): $0.04/call via x402. Deterministically evaluates a proposed market action against buyer policy, fees, risk limits, and public evidence, returning a replayable ADMIT or REJECT decision
- [structural-claim-option-value](https://www.zero.xyz/c/structural-claim-option-value-9aef5e31/llms.txt): $0.01/call via x402. Computes a schedule-delay option-value heuristic for a single infrastructure claim, classifying what approval operation it constrains and what happens on violation.

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)