Deterministic Truth Suite (x402)

Endpoints (38 live)

• GET /cite — Deterministic citation formatter — APA 7, MLA 9, Chicago 17 author-date, BibTeX. From structured fields, returns the reference entry (markdown/html/plain) + the in-text citation, reproducing published style-manual examples exactly. For full author lists use POST. Every answer signed. Free sample, no payment required: GET /play/cite (0.001 USDC on Base)
• GET /tip/1 — 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. (1 USDC on Base)
• POST /tip/20 — 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. Same computation as GET; send the parameters as a JSON body. (20 USDC on Base)
• GET /tip/20 — 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. (20 USDC on Base)
• POST /tip/1 — 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. Same computation as GET; send the parameters as a JSON body. (1 USDC on Base)
• GET /tip/5 — 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. (5 USDC on Base)
• POST /tip/5 — 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. Same computation as GET; send the parameters as a JSON body. (5 USDC on Base)
• POST /timestamp — 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. Same computation as GET; send the parameters as a JSON body. (0.001 USDC on Base)
• GET /readability — Deterministic readability scores (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) over published formulas. For long text use POST. Signed. (0.001 USDC on Base)
• POST /readability — Readability scores for long text — JSON body {text}. (0.001 USDC on Base)
• POST /cite — Citation formatter (APA/MLA/Chicago/BibTeX) from structured JSON — {style, type, title, authors:[{family,given}], editors, container, volume, issue, pages, publisher, place, doi, url, book_title, month, day, locator}. Free sample, no payment required: GET /play/cite (0.001 USDC on Base)
• GET /unit — Deterministic unit conversion reproducing NIST SP 811 exact factors (length, mass, volume, energy, power, pressure, force, area, speed, data, angle, frequency + affine temperature). Every answer signed. Free sample, no payment required: GET /play/unit (0.001 USDC on Base)
• POST /verify/sig — Recover the signer (EIP-191 or EIP-712) — JSON body {signature, message | typed_data, type, expected_signer?}. (0.002 USDC on Base)
• POST /auction/create — Open a sealed-bid auction (close round N). Bidders timelock-seal bids to N; nobody can read any bid until N; highest wins, signed + re-verifiable. bid/open/get are free. (0.01 USDC on Base)
• POST /sky — Deterministic ephemeris snapshot (one location/time). Same computation as GET; send the parameters as a JSON body. Free sample, no payment required: GET /play/sky (0.003 USDC on Base)
• POST /field — Deterministic WMM2025 magnetic field (one location/date). Same computation as GET; send the parameters as a JSON body. Free sample, no payment required: GET /play/field (0.002 USDC on Base)
• POST /proofread — Rule-based proofreading flags for long text — JSON body {text}. (0.001 USDC on Base)
• GET /proofread — 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. (0.001 USDC on Base)
• POST /syntax — Syntax validation for long source — JSON body {content, lang, test?}. Free sample, no payment required: GET /play/syntax (0.001 USDC on Base)
• GET /prosody — Deterministic phonetic rhyme (perfect + scored slant), pronunciation, syllables, scansion, homophones — from CMUdict. Free sample, no payment required: GET /play/prosody (0.001 USDC on Base)

+18 more endpoints.