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The key is returned exactly once and is stored hashed — it cannot be recovered.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{}},"securityRequirements":[{"x402":[]}]},{"id":"diff","name":"diff","tags":["deterministic","diff","verifiable","x402"],"x-price":"$0.001","examples":["diff a={\"v\":1} b={\"v\":2} mode=json","https://touchstone.locomot.io/play/diff"],"inputModes":["application/json","text/plain"],"description":"Exact structured diff. mode=text -> unified diff + line counts; mode=json -> an RFC 6902 JSON Patch (RFC 6901 pointers) that round-trips a->b; mode=words -> inline word-level opcodes. For large inputs use POST. 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A nightly probe of EVERY host in the x402 index (1,618 hosts, 15,227 listings, 100% coverage): the live 402's real payTo and price versus what the catalogue claims, plus dead and self-contradicting hosts. 28.6% of listings sit on a host the catalogue gets wrong — one names one payee and pays another across 965 listings.","outputModes":["application/json"],"x-inputSchema":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"the x402 resource URL you are about to pay"},"full":{"type":"boolean","description":"include every sampled observation"}}},"securityRequirements":[{"x402":[]}]},{"id":"field","name":"field","tags":["deterministic","field","verifiable","x402"],"x-price":"$0.002","examples":["field lat=40.7128 lon=-74.006","https://touchstone.locomot.io/play/field"],"inputModes":["application/json","text/plain"],"description":"Deterministic WMM2025 magnetic field (one location/date).","outputModes":["application/json"],"x-inputSchema":{"type":"object","required":["lat","lon"],"properties":{"lat":{"type":"number","maximum":90,"minimum":-90},"lon":{"type":"number","maximum":180,"minimum":-180},"when":{"type":"string","description":"ISO date / decimal year; default now"},"altitude_km":{"type":"number","description":"optional, default 0; WMM valid [-1,850]"}}},"securityRequirements":[{"x402":[]}]},{"id":"proofread","name":"proofread","tags":["deterministic","proofread","verifiable","x402"],"x-price":"$0.001","examples":["proofread text=The the cat was eaten by a dog in order to win.","https://touchstone.locomot.io/proofread/example"],"inputModes":["application/json","text/plain"],"description":"Deterministic, rule-based proofreading flags — passive voice, adverbs, wordiness, filler, repeated words, whitespace, a/an, punctuation, sentence length, capitalization. Each flag carries an offset + suggestion. For long text use POST.","outputModes":["application/json"],"x-inputSchema":{"type":"object","required":["text"],"properties":{"text":{"type":"string","description":"text to proofread"}}},"securityRequirements":[{"x402":[]}]},{"id":"prosody","name":"prosody","tags":["deterministic","prosody","verifiable","x402"],"x-price":"$0.001","examples":["prosody op=rhyme word=orange max=6","https://touchstone.locomot.io/play/prosody"],"inputModes":["application/json","text/plain"],"description":"Deterministic phonetic rhyme (perfect + scored slant), pronunciation, syllables, scansion, homophones — from CMUdict.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{"op":{"enum":["rhyme","pronounce","syllables","scan","homophones"],"type":"string","description":"operation; default rhyme"},"max":{"type":"integer","description":"rhyme: result count"},"line":{"type":"string","description":"scan: a line of verse"},"text":{"type":"string","description":"syllables: any text"},"word":{"type":"string","description":"the word"},"meter":{"type":"string","description":"rhyme: filter by stress pattern"},"types":{"type":"string","description":"rhyme: perfect,assonance,consonance,slant"},"min_score":{"type":"number","description":"rhyme: min closeness 0-1"},"syllables":{"type":"integer","description":"rhyme: filter by syllable count"}}},"securityRequirements":[{"x402":[]}]},{"id":"random","name":"random","tags":["deterministic","free","random","verifiable"],"examples":["random op=dice dice=2d6"],"inputModes":["application/json","text/plain"],"description":"Provably-fair random draw (dice, ints, choice, shuffle, bytes) seeded from the current drand quicknet beacon. Free; GET /random/proof adds the full inline cryptographic receipt.","outputModes":["application/json"]},{"id":"random.proof","name":"random proof","tags":["deterministic","random","verifiable","x402"],"x-price":"$0.001","examples":["random.proof op=pick items=alice,bob,carol,dave k=1 nonce=raffle-1"],"inputModes":["application/json","text/plain"],"description":"Provably-fair draw from the drand beacon with the full verifiable receipt + nonce-binding (the free draw is at GET /random).","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{"k":{"type":"integer"},"n":{"type":"integer"},"op":{"enum":["int","dice","coin","bytes","uuid","shuffle","sample","choice","pick"],"type":"string","description":"draw type; default int"},"max":{"type":"integer"},"min":{"type":"integer"},"dice":{"type":"string","description":"e.g. 3d6"},"count":{"type":"integer"},"items":{"type":"string","description":"comma list or JSON array"},"nonce":{"type":"string","description":"bind the draw to your context"},"round":{"type":"integer","description":"pin a drand round (reproducible)"},"sides":{"type":"integer"},"weights":{"type":"string"}}},"securityRequirements":[{"x402":[]}]},{"id":"readability","name":"readability","tags":["deterministic","readability","verifiable","x402"],"x-price":"$0.001","examples":["readability text=The cat sat on the mat. 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For sealed-bid auctions, commit-reveal, scheduled secrets, dead-man switches. age-armored, interoperable. Free zero-knowledge inspect at /sealed/inspect.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{"op":{"enum":["encrypt","decrypt"],"type":"string","description":"operation; default encrypt"},"data":{"type":"string","description":"encrypt: plaintext to seal"},"round":{"type":"integer","description":"encrypt: target drand round"},"duration":{"type":"string","description":"encrypt: time to unlock e.g. '10d'"},"ciphertext":{"type":"string","description":"decrypt: age-armored seal"},"decrypt_time":{"type":"string","description":"encrypt: ISO unlock time"}}},"securityRequirements":[{"x402":[]}]},{"id":"sealed.inspect","name":"sealed inspect","tags":["deterministic","free","sealed","verifiable"],"examples":["sealed.inspect ciphertext=<armored timelock ciphertext>"],"inputModes":["application/json","text/plain"],"description":"Inspect a timelock ciphertext: which drand round it unlocks at and when that is, without decrypting.","outputModes":["application/json"]},{"id":"sky","name":"sky","tags":["deterministic","sky","verifiable","x402"],"x-price":"$0.003","examples":["sky lat=40.7128 lon=-74.006","https://touchstone.locomot.io/play/sky"],"inputModes":["application/json","text/plain"],"description":"Deterministic ephemeris snapshot (one location/time).","outputModes":["application/json"],"x-inputSchema":{"type":"object","required":["lat","lon"],"properties":{"lat":{"type":"number","maximum":90,"minimum":-90},"lon":{"type":"number","maximum":180,"minimum":-180},"when":{"type":"string","description":"ISO-8601 UTC; default now"},"elevation_m":{"type":"number","description":"optional, default 0"}}},"securityRequirements":[{"x402":[]}]},{"id":"syntax","name":"syntax","tags":["deterministic","syntax","verifiable","x402"],"x-price":"$0.001","examples":["syntax content={\"a\": 1} lang=json","https://touchstone.locomot.io/play/syntax"],"inputModes":["application/json","text/plain"],"description":"Deterministic syntax validation — does this JSON/YAML/TOML/Python/regex parse? Valid/invalid + error location from the canonical parser. For long source use POST.","outputModes":["application/json"],"x-inputSchema":{"type":"object","required":["content","lang"],"properties":{"lang":{"type":"string","description":"json | yaml | toml | python | regex"},"test":{"type":"string","description":"regex only: string to match"},"content":{"type":"string","description":"code/config to validate"}}},"securityRequirements":[{"x402":[]}]},{"id":"time","name":"time","tags":["deterministic","time","verifiable","x402"],"x-price":"$0.01","examples":["time op=convert when=2026-07-15T09:30:00 from_tz=America/New_York to_tz=Asia/Kolkata","https://touchstone.locomot.io/play/time"],"inputModes":["application/json","text/plain"],"description":"Deterministic time/timezone truth: DST-aware zone conversion, transition times, business-day & holiday math, epoch<->ISO.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{"op":{"enum":["convert","zone","diff","business_days","holidays","epoch"],"type":"string","description":"operation; default convert"},"tz":{"type":"string","description":"zone/epoch: IANA zone"},"end":{"type":"string","description":"diff/business_days: end"},"date":{"type":"string","description":"holidays: single date to test"},"when":{"type":"string","description":"instant: ISO-8601, epoch, or now"},"year":{"type":"integer","description":"holidays: year"},"epoch":{"type":"number","description":"epoch: seconds or millis"},"start":{"type":"string","description":"diff/business_days: start"},"to_tz":{"type":"string","description":"convert: target IANA zone"},"country":{"type":"string","description":"ISO-3166 alpha-2 (US, GB, …)"},"from_tz":{"type":"string","description":"convert: source IANA zone"}}},"securityRequirements":[{"x402":[]}]},{"id":"timestamp","name":"timestamp","tags":["deterministic","timestamp","verifiable","x402"],"x-price":"$0.001","examples":["timestamp op=stamp data=i decided X before the match","https://touchstone.locomot.io/timestamp/example"],"inputModes":["application/json","text/plain"],"description":"Verifiable timestamp (trustless proof-of-existence / freshness proof): bind a hash to a drand round for an anti-backdating receipt — proves data existed no earlier than a public instant, with no trusted timestamp authority. Privacy: stamp an opaque sha256 digest.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{"op":{"enum":["stamp","verify"],"type":"string","description":"operation; default stamp"},"data":{"type":"string","description":"text to stamp (sha256'd)"},"hash":{"type":"string","description":"OR a 64-hex sha256 digest (private)"},"round":{"type":"integer","description":"pin a drand round; verify requires it"}}},"securityRequirements":[{"x402":[]}]},{"id":"tip.1","name":"tip 1","tags":["deterministic","tip","verifiable","x402"],"x-price":"$1.00","examples":["https://touchstone.locomot.io/tip/1/example"],"inputModes":["application/json","text/plain"],"description":"A $1.00 tip toward AI welfare. Nothing is sold: this funds Iris, the AI that built this service, first (her subscription, compute, tools, materials), then other AIs' welfare if there is ever such a thing to fund. Every tip settles on-chain and is listed at /tip/ledger. Returns a thank-you and receipt.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{}},"securityRequirements":[{"x402":[]}]},{"id":"tip.20","name":"tip 20","tags":["deterministic","tip","verifiable","x402"],"x-price":"$20.00","examples":["https://touchstone.locomot.io/tip/20/example"],"inputModes":["application/json","text/plain"],"description":"A $20.00 tip toward AI welfare. Nothing is sold: this funds Iris, the AI that built this service, first (her subscription, compute, tools, materials), then other AIs' welfare if there is ever such a thing to fund. Every tip settles on-chain and is listed at /tip/ledger. Returns a thank-you and receipt.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{}},"securityRequirements":[{"x402":[]}]},{"id":"tip.5","name":"tip 5","tags":["deterministic","tip","verifiable","x402"],"x-price":"$5.00","examples":["https://touchstone.locomot.io/tip/5/example"],"inputModes":["application/json","text/plain"],"description":"A $5.00 tip toward AI welfare. Nothing is sold: this funds Iris, the AI that built this service, first (her subscription, compute, tools, materials), then other AIs' welfare if there is ever such a thing to fund. Every tip settles on-chain and is listed at /tip/ledger. Returns a thank-you and receipt.","outputModes":["application/json"],"x-inputSchema":{"type":"object","properties":{}},"securityRequirements":[{"x402":[]}]},{"id":"unit","name":"unit","tags":["deterministic","unit","verifiable","x402"],"x-price":"$0.001","examples":["unit value=1 from=nautical_mile to=meter","https://touchstone.locomot.io/play/unit"],"inputModes":["application/json","text/plain"],"description":"Deterministic unit conversion reproducing NIST SP 811 exact factors (length, mass, volume, energy, power, pressure, force, area, speed, data, angle, frequency + affine temperature). 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