# Services from touchstone.locomot.io on Zero

> touchstone.locomot.io serves 15 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/touchstone.locomot.io
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/touchstone.locomot.io/health.json

## Services

- [touchstone.locomot.io Syntax Validator](https://www.zero.xyz/c/touchstone-locomot-io-syntax-validator-cb90bcbc/llms.txt): $0.001/call via x402. Validates JSON, YAML, TOML, Python, or regex syntax using the canonical parser, returning a valid/invalid result plus error location on failure
- [Touchstone Structured Diff API](https://www.zero.xyz/c/touchstone-structured-diff-api-203d56dd/llms.txt): $0.001/call via x402. Computes exact structured diffs between two inputs in text (unified diff), JSON (RFC 6902 JSON Patch), or word-level opcode modes, with every response cryptographically signed.
- [Touchstone Verifiable Timestamp (Proof-of-Existence)](https://www.zero.xyz/c/touchstone-verifiable-timestamp-proof-of-existence-d669017e/llms.txt): $0.001/call via x402. Binds a SHA-256 digest to a public drand randomness beacon round, producing a trustless anti-backdating receipt proving data existed no earlier than a specific instant.
- [touchstone.locomot.io – EIP-191 Signature Verification (ecrecover)](https://www.zero.xyz/c/touchstone-locomot-io-eip-191-signature-verification-ecrecover-a97e7ba9/llms.txt): $0.002/call via x402. Recovers the Ethereum address that signed a message using ecrecover / EIP-191 personal_sign, optionally validating against an expected signer address.
- [Touchstone Earth Magnetic Field API](https://www.zero.xyz/c/touchstone-earth-magnetic-field-api-0c689cd6/llms.txt): $0.002/call via x402. Returns Earth's magnetic field components, declination, inclination, and total intensity for a given latitude/longitude using the World Magnetic Model (WMM)
- [Touchstone x402 Door Verifier](https://www.zero.xyz/c/touchstone-x402-door-verifier-19c5c99e/llms.txt): $0.002/call via x402. Checks a given x402-protected URL against the catalogue index to verify whether the payTo address and price match what the catalogue claims, flagging mismatches, dead hosts, and self-contradicting entries.
- [Touchstone Prosody API](https://www.zero.xyz/c/touchstone-prosody-api-5005dd2c/llms.txt): $0.001/call via x402. Provides poetry and phonetic analysis operations including rhyme finding, pronunciation lookup, syllable counting, verse scanning, and homophone detection for any word or line of text.
- [Touchstone Sky — Astronomical Ephemeris API](https://www.zero.xyz/c/touchstone-sky-astronomical-ephemeris-api-c6fa0eca/llms.txt): $0.003/call via x402. Returns sun, moon, planetary body positions, twilight times, and next seasonal event for a given lat/lon and optional time
- [Touchstone Proofreader](https://www.zero.xyz/c/touchstone-proofreader-cb352731/llms.txt): $0.001/call via x402. Runs deterministic, rule-based proofreading on text and returns flagged issues (passive voice, adverbs, wordiness, filler, repeated words, whitespace, a/an, punctuation, sentence length, capitalization) with offsets and suggestions.
- [Touchstone Time API](https://www.zero.xyz/c/touchstone-time-api-7efbcf5d/llms.txt): $0.01/call via x402. Performs timezone conversions, time diffs, business day calculations, holiday lookups, and epoch conversions for a given instant or date range
- [Touchstone Readability Scorer](https://www.zero.xyz/c/touchstone-readability-scorer-8e468e22/llms.txt): $0.001/call via x402. Computes deterministic readability scores (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) for any input text using published formulas
- [Touchstone Citation Formatter](https://www.zero.xyz/c/touchstone-citation-formatter-f7f8f3cd/llms.txt): $0.001/call via x402. Formats academic citations in APA 7, MLA 9, Chicago 17 author-date, or BibTeX style from structured bibliographic fields, returning both the full reference entry and in-text citation.
- [Touchstone Locomot Random Proof](https://www.zero.xyz/c/touchstone-locomot-random-proof-4785f3b4/llms.txt): $0.001/call via x402. Generates cryptographically verifiable random draws (integers, dice rolls, coin flips, UUIDs, shuffles, etc.) backed by a drand beacon proof
- [Touchstone Unit Converter](https://www.zero.xyz/c/touchstone-unit-converter-bd927d2d/llms.txt): $0.001/call via x402. Converts a numeric quantity from one unit of measurement to another within the same dimension (e.g. miles to kilometers, kg to pounds, °C to °F).
- [Touchstone Locomot Sealed Timelock Encryption](https://www.zero.xyz/c/touchstone-locomot-sealed-timelock-encryption-87e0011d/llms.txt): $0.005/call via x402. Encrypts plaintext using drand timelock (tlock) so it can only be decrypted after a specified future round or time, and decrypts previously sealed ciphertexts

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)