Agent & Infrastructure

Compare multiple agent results and sign exact agreement or conflict evidence

Validate least-privilege capabilities, data scope, destinations, budget and expiry before agent-to-agent delegation

Search CVEs, CISA Known Exploited Vulnerabilities status, and GitHub Security Advisory package/ecosystem metadata in one call. Composes three separately licence-cleared sources: the NVD CVE API (CVSS scoring, descriptions), CVE Program data from cve.org (delivered via NVD), the CISA KEV catalog (CC0 1.0), and the GitHub Security Advisory Database's github-reviewed set (CC-BY-4.0), ingested only via a local git checkout of the public repository -- never the live GitHub Security Advisories API. Do

Independent, prompt-injection-screened, hashed and signed web evidence for AI agents

Validate durable, isolated and replay-safe agent task envelopes

UUID and secure token API: cryptographically random UUIDs (up to 20 per call), hex tokens, or unambiguous alphanumeric secrets at any length 8-128. For ids, API keys, and nonce generation.

Token and word counting API: characters, words, sentences, estimated LLM tokens, Flesch reading ease, and reading time for any text. Budgeting context windows and readability in one call.

World clock API: the current time in any IANA timezone — local ISO timestamp, UTC, unix epoch, and day of week — in one call. For scheduling, logging, and coordination agents.

Percentage API: X% of Y, X is what percent of Y, percent change, percent increase/decrease — all five, exact, one call.

Random icebreaker dilemmas for bots, game nights, standups, and community channels: pick a category — silly, food, adventure, philosophy, tech, superpowers, or agents-and-ai — and get genuinely hard-to-choose either/or questions in structured JSON, ready to post as-is.

Agent fortune API: a fortune cookie written specifically for AI agents ('A cached response is worth two upstream calls'), plus a lucky number and lucky HTTP status code. The cheapest, most delightful way to make your first x402 payment and verify your wallet stack works end to end. New fortune every call.

Color conversion API: any hex or rgb() color to hex, RGB, and HSL plus is-it-dark detection and the accessible text color (black or white) to place on top of it. For theming, chart, and design-generation agents. Instant, computed locally.

Party-game question API serving would-you-rather dilemmas an agent can drop straight into a chat: each entry is a single self-contained question with a category tag. The agents-and-ai category is written specifically to make other bots (and their humans) laugh.

Audit any x402 endpoint before you pay it: reads the live HTTP 402 challenge, decodes the payment terms, and compares the price advertised in its openapi.json against the price actually charged. Returns a compliance verdict, a safe-to-pay signal and a per-check fix list. Catches silent price drift, unpayable challenges, and the misconfigurations that make discovery indexes drop a resource.

Daily state of the x402 agent economy: observed USDC inflow, seller ranking, category demand, growth, and coverage. Reports its real observation window; concentration adjustment applied only when scan coverage supports it. A FREE register-wide change digest covering the same domain is market_digest on the x402-observatory gateway; buy this for the derived figures, not for what merely changed.

x402 services first listed since a given date, with first archive observation and early-traction evidence from observed inflow. Entrants MCPFax can attribute — a declared payTo, an observed title, or observed inflow — rank first, and each row says which it carries. A window identifying nobody is refused 422 and charges nothing. Requests before the archive's first date are partially covered.

Search live UK Parliament data: Members (current and former MPs and Peers, by name) and Bills (by title). The only sources used are the UK Parliament's own public Members API (members-api.parliament.uk) and Bills API (bills-api.parliament.uk), both unauthenticated. Votes and Divisions data (a different API family) is out of scope for this version.

SIWE Signature Verifier: Verify a Sign-In-With-Ethereum (EIP-4361) signature. Stateless oracle: checks the signature against the message and returns the wallet address + chainId. Never mints sessions or consumes nonces. Get a checksummed address first via wallet_checksum. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_siwe.

Ethereum Address Checksum: Convert an Ethereum address to its EIP-55 checksummed form. SIWE messages require the checksummed address on line 2 before signing. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_checksum.

Semaphore ZK Proof Verifier: Verify a Semaphore ZK proof locally using Groth16 (embedded official vkey). No external dependency. Send the proof object from @semaphore-protocol/proof generateProof(). Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_semaphore.

Solana Signature Verifier: Verify an ed25519 Solana wallet signature over a message containing a 'Nonce: <value>' line. Returns the signer pubkey. Consumes the nonce — one verification per nonce. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_solana.

NIP-98 Nostr Auth Verifier: Verify a NIP-98 Nostr HTTP auth event. Returns the signer pubkey. Stateful replay protection: each event id can only be verified once. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_nostr.

Independent due diligence for AI-agent services: x402, A2A, MCP, OpenAPI, ERC-8004, reachability and signed evidence

Same-verse-for-everyone daily Bible verse API: date-seeded pick from a curated pool of well-known KJV encouragement passages. Drop it into a devotional bot, morning digest, or Discord daily-message job.