What the same transaction costs right now on Base, Optimism, Arbitrum and Ethereum, in USD, cheapest chain first.

Get real-time spot price and market data for a cryptocurrency

Discover the callable public API behind a developer or documentation page: identify candidate API base URLs, developer portals, machine-readable API docs and authentication documentation for integration setup. Base mainnet USDC

DeFi lending rates vs Treasury yields: USDC supply and borrow APR on Aave v3 across five chains, read on chain, against the 3-month T-bill, with the spread and what it says about on-chain leverage demand. Use to compare DeFi and TradFi dollar yields.

US Treasury yields and yield curve: par and real (TIPS) curves with daily changes, 2s10s/3m10y/5s30s slopes and inversion flags, 10y breakeven inflation, and SOFR, EFFR and euro STR. Use for the interest-rate backdrop of any trade.

Trading signal accuracy and hit rate, live: whether price moved in the signal's direction after 5m, 15m, 1h and 24h, per signal type and per confidence bucket (calibration), over days=1-120, optionally for one symbol, with the latest signals and outcomes. Use to judge how reliable the signals are.

QR/Barcode Generator: Generate a QR code or barcode as an image (SVG or PNG). Returns a base64-encoded image (MCP content type image). Symbologies: qrcode/qr, code128, code39, ean13, ean8, upca, upce, isbn10, isbn13, issn, itf, gs1-128, databar. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/qr_generator.

OpenAPI Changelog Generator: Diff two OpenAPI specs and generate a structured breaking-change changelog (no LLM — deterministic diff). Provide base_spec_url and new_spec. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/changelog_openapi.

World ID Proof Verifier: Verify a World ID 4.0 proof via the Worldcoin Developer Portal API. Generates an RP signature server-side, then proxies the full IDKit proof to developer.world.org. Returns { valid, nullifier, worldcoin_response }. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_worldid.

Universe-wide composite breadth at one horizon — bullish/bearish/neutral counts and percentages across 200+ assets, sliced by regime, with full per-asset stance list. Is this rally broad or concentrated?

Browserbase — Create a headless browser session via x402. Charges 0.2¢ per minute of estimatedMinutes (minimum 5). Returns sessionId + connectUrl.

MX/SPF/DMARC preflight; not mailbox verification. Base mainnet USDC

Discover machine-readable integration documentation from a public developer/docs page: llms.txt, Markdown alternates, API/auth docs, OpenAPI or Swagger specifications, and MCP candidates. Candidates are returned only after bounded verification. Maximum 10 HTTP requests; no JavaScript, recursive crawl or authenticated content. Base mainnet USDC

Search Reels site-wide by keyword (not scoped to one profile — use instagram.profile.reels.list; not trending — use instagram.reels.trending.list; not audio-page — use instagram.audio.reels.list).

Generate an image from a text prompt using GPT Image 2 (low quality, 1024x1024). No API key needed; pay per call via x402. Returns base64 PNG. Prompt capped at 1000 chars. A render takes 10 to 30 s; use a client timeout of at least 60 s.

US Producer Price Index (PPI) in one call, live from FRED: headline Final Demand PPI and core PPI (ex food & energy), both YoY -- a leading inflation indicator that moves ahead of the consumer-side CPI/PCE already in /economic-indicators, since producer cost changes flow through to consumer prices with a lag. Not ticker-specific. $0.01/call.

Purchase and download the Broken Key Remapper software (one-time license).

Name search, European registers. Local copies, all searched without pays: Belgium, Croatia, Cyprus, Estonia, Ireland, Latvia, Lithuania, Norway, Romania, Sweden, Spain (BORME); live only with pays set: Czechia, Finland, Slovakia, Switzerland; Poland through GLEIF; DK/UK if enabled; +GLEIF. Top 10, score_confiance. BE, CH, CZ, DK, EE, HR, LT, LV, NO, RO, SE, SK: legal persons only (no FIE, ENK, IK), nor ES sole traders; no GLEIF sole proprietor or CH branch (ecartes; ecartes_non_mesures (LV/NO)).

Safety verdict for one Solana token mint: a graded risk score with the concrete reasons behind it, mint and freeze authority state, how much of the liquidity pool is locked, top-holder concentration, holder count and whether the token is verified. Use it before an agent buys, quotes, or recommends an unfamiliar token, and to screen a list of mints in seconds.

An executable swap on Base, routed by 0x across Uniswap, Aerodrome, Balancer, Curve and more. Returns the transaction for your own wallet to sign, plus the approval step if needed, minimum out, route and fees. We never hold funds. Name tokens as ETH, USDC, WETH, cbBTC, AERO… or a 0x address; buying an unknown token runs a sellability check first and refuses a honeypot unless force=1.