Terms of Use
Last updated: March 2026
The French version of these Terms prevails in case of discrepancy. By using Vayu, you agree to be bound by the following terms.
1. Service Description and Regulatory Status
Vayu is a cryptocurrency data indexing and analysis platform. It provides CSV exports of on-chain data (pool events, wallet transaction history across Multi-chain EVM) with automated fiscal classification for analysis purposes. Vayu is NOT a Digital Asset Service Provider (PSAN) under Article L.54-10-2 of the French Monetary and Financial Code, nor a Crypto-Asset Service Provider (CASP) under EU Regulation 2023/1114 (MiCA). Vayu is not registered with the SEC, CFTC, FCA, FINMA, MAS, FSA, or any financial regulatory authority. Vayu does not provide custody, exchange, transfer, or portfolio management services for crypto-assets.
2. No Financial, Tax, or Legal Advice
IMPORTANT: Vayu does NOT provide financial, tax, investment, or legal advice of any kind. The fiscal classifications generated by the Service (Acquisition, Disposal, Income, Neutral, Swap) are produced by automated algorithms for informational purposes only. They do not constitute tax advice under French law (Loi n. 71-1130 of December 31, 1971), nor under US Treasury Circular 230 (31 CFR Part 10), nor under any other jurisdiction's regulations. Vayu is not a tax return preparer (26 U.S.C. 7701(a)(36)), a Certified Public Accountant, an Enrolled Agent, or a licensed tax professional. The classifications are based on article 150 VH bis of the French General Tax Code and may not reflect tax treatment in other jurisdictions. You MUST consult a qualified tax professional before relying on any data from this Service for tax filings or financial decisions.
3. Data Provided 'As Is'
THE SERVICE IS PROVIDED 'AS IS' AND 'AS AVAILABLE' WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. Vayu does not guarantee the completeness, accuracy, timeliness, or reliability of any data, including: - On-chain transaction history (may be incomplete due to blockchain reorganizations, API limitations, or unsupported protocols) - Token prices (aggregated from third-party sources, may contain carry-forward approximations or errors) - Fiscal classifications (automated heuristics that may produce incorrect results) - DeFi position valuations (based on on-chain balanceOf calls that may not capture all protocol interactions) - Portfolio valuations in EUR/USD (based on daily exchange rates from the European Central Bank)
4. Token Pricing Limitations
Token prices are determined by a multi-source system and do NOT constitute official market quotations: - Prices come from on-chain events (Uniswap/PancakeSwap Sync/Swap), DefiLlama, Moralis, GeckoTerminal, and DexScreener. Different sources may provide different prices for the same token. - When no price event is available, the last known price is carried forward. For low-liquidity tokens, this may persist for thousands of blocks and diverge significantly from actual market price. - LP tokens are valued using Net Asset Value (NAV) based on on-chain reserves. This method may be imprecise in cases of pool manipulation or impermanent loss. - Prices are validated against neighbors (50x ratio threshold). Some erroneous prices may still pass validation. - EUR amounts use daily ECB exchange rates (not intraday). All transactions on the same day use the same rate.
5. Fiscal Classification Limitations
The automated fiscal classification uses 85 hand-written protocol decoders and 5,922 generated decoders. Known limitations: - Unrecognized protocols are classified by a fallback heuristic that may be less accurate. - The distinction between neutral transfers (self-transfers, bridges) and taxable disposals relies on heuristics that may be incorrect, especially for multi-hop bridges or smart wallets (Gnosis Safe). - DeFi income (staking rewards, lending interest, airdrops) is classified as 'Income' generically. The exact tax treatment (BNC, BIC, capital gains) depends on your personal situation. - NFT transactions are classified as Swap. NFTs may have specific tax treatments that are beyond the scope of automated classification. - The classification covers article 150 VH bis CGI (occasional capital gains). It does NOT cover BIC (habitual trading, art. 34 CGI), BNC (mining/staking income, art. 92 CGI), or other tax regimes. - Tax laws evolve. The classification may not reflect current legislation at the time of your filing.
6. Third-Party Data Providers
Vayu relies on third-party services whose availability and accuracy are beyond our control: - On-chain indexing: Envio/HyperSync - RPC nodes: PublicNode, dRPC (archive nodes on 5 chains) - Pricing: DefiLlama, Moralis, GeckoTerminal, DexScreener - Security: GoPlus Security (scam/honeypot detection on 14 chains) - Labels: Blockscout, Etherscan, Sourcify - CEX APIs: Binance, Coinbase, Kraken, Bybit, MEXC - Exchange rates: Frankfurter API (European Central Bank) Temporary or permanent unavailability of any third-party service may result in incomplete or unavailable data. Vayu is not liable for third-party service failures.
7. CEX Integration
When you provide CEX API credentials: - Credentials are transmitted exclusively via HTTPS and are NEVER stored, cached, or logged by Vayu. They exist only in server memory for the duration of the request. - You MUST create read-only API keys. Vayu does not verify key permissions and is not liable if you provide keys with trading or withdrawal permissions. - Data completeness depends on each exchange's API limitations (e.g., MEXC limits trade history to 30 days, Bybit to 7 days). - Deposit/withdrawal deduplication against on-chain transactions uses heuristic matching that may not be perfect. - You are responsible for revoking API keys after use.
8. User Responsibility
You are solely responsible for: - Verifying ALL exported data before use in tax declarations, financial decisions, or any other purpose - Consulting a qualified tax professional (CPA, tax attorney, expert-comptable) for your specific situation - Determining the applicable tax regime for your crypto transactions (capital gains, BIC, BNC, or other) - Filing accurate tax returns with the relevant authorities (formulaire 2086, IRS forms, or equivalent) - Declaring foreign crypto accounts if required (formulaire 3916-bis in France, FBAR in the US) - Complying with all applicable laws and regulations in your jurisdiction - Securing your account credentials, API keys, and wallet private keys - Using the Service only for lawful purposes
9. Account Security
You must be at least 18 years old (or the age of majority in your jurisdiction) to create an account. Each account is personal and non-transferable. You agree to: - Maintain the confidentiality of your authentication credentials - Enable two-factor authentication (2FA) on linked email/social accounts where available - Notify us within 24 hours if you suspect unauthorized access to your account - Not share, sell, or transfer your account to third parties - Not create multiple accounts to circumvent free tier limits or credit quotas All actions performed from your account are presumed to be yours. Vayu is not liable for unauthorized access resulting from your failure to secure your credentials.
10. Credits and Payments
Credits are purchased as one-time packs (Starter, Standard, Pro, Business) and never expire. Prices are displayed and charged in EUR. Payments are processed by Stripe (card, Apple Pay, Google Pay). Free tier: 100 credits every 4 hours per IP address, no account required. By completing a purchase, you expressly consent to immediate execution of the contract and expressly waive your 14-day right of withdrawal under Article L.221-28, 13 of the French Consumer Code, as credits are digital content delivered immediately upon payment.
11. Refund Policy
Purchased credits are non-refundable, non-exchangeable, and non-transferable, except: - Technical error: In case of double billing or credits not delivered, you may request a full refund within 30 days by contacting support. Refunds are processed in EUR regardless of original payment method. - Service malfunction: If a major service failure prevented you from using your credits, Vayu may, at its discretion, issue a refund or re-credit your account. Abusive chargebacks result in immediate account suspension, deduction of corresponding credits, and a 15 EUR chargeback fee. Repeat offenders will be permanently banned.
12. Limitation of Liability
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, VAYU'S TOTAL CUMULATIVE LIABILITY FOR ALL CLAIMS ARISING FROM OR RELATED TO THE SERVICE SHALL NOT EXCEED THE GREATER OF: (A) THE TOTAL AMOUNT PAID BY YOU IN THE 12 MONTHS PRECEDING THE CLAIM, OR (B) ONE HUNDRED EUROS (100 EUR). IN NO EVENT SHALL VAYU BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING BUT NOT LIMITED TO: LOSS OF PROFITS, LOSS OF DATA, LOSS OF BUSINESS OPPORTUNITIES, TAX PENALTIES, FINES, INTEREST, ADDITIONAL TAXES ASSESSED BY ANY TAX AUTHORITY, OR COSTS OF SUBSTITUTE SERVICES. This limitation does not apply to damages caused by willful misconduct (dol) or gross negligence (faute lourde), or where applicable law prohibits such limitation (Article 1170 of the French Civil Code).
13. Force Majeure
Vayu shall not be liable for any failure or delay resulting from circumstances beyond its reasonable control, including but not limited to: - Blockchain network failures, congestion, hard forks, chain reorganizations, or 51% attacks - Unavailability, modification, or discontinuation of third-party APIs (HyperSync, DefiLlama, Moralis, GoPlus, exchange APIs) - Regulatory changes, sanctions, or government actions affecting crypto-assets - Cloud infrastructure failures, DNS outages, or telecommunications disruptions - Cyberattacks (DDoS, smart contract exploits) - Natural disasters, pandemics, wars, or terrorism If force majeure persists for more than 90 days, either party may terminate without liability.
14. Indemnification
You agree to indemnify, defend, and hold harmless Vayu, its officers, employees, and contractors from and against any claims, losses, damages, costs, and expenses (including reasonable attorney fees) arising from or related to: - Your use of the Service, including any tax filings based on exported data - Your violation of these Terms - Your violation of any third-party rights - Your provision of CEX API credentials with excessive permissions - Any inaccurate or misleading information you provide to the Service
15. Intellectual Property
The Vayu platform, including its algorithms, decoders, pricing models, classification logic, user interface, and source code, is the exclusive property of Vayu. Raw on-chain data (transaction hashes, block numbers, addresses) is publicly available and not claimed as proprietary. However, the processed data (fiscal classifications, enriched labels, price calculations, structured CSV format) constitutes a protected compilation. You are granted a perpetual, non-exclusive license to use your own exported CSV files for personal or internal business purposes (tax filings, portfolio analysis). You may NOT redistribute, resell, or use exported data to build competing services, train AI models, or create derivative products without written authorization.
16. Prohibited Uses
You shall not: - Use the Service to build or contribute to a competing product - Scrape, crawl, or systematically extract data from the platform - Circumvent rate limits, credit metering, or security features - Use automated tools (bots, scripts) to create accounts or submit requests - Reverse engineer, decompile, or attempt to derive the source code or algorithms - Share, publish, or transfer authentication tokens or session credentials - Use the Service for money laundering, terrorist financing, tax fraud, or any illegal purpose - Present Vayu's data as your own original work
17. Geographic Restrictions and Sanctions
The Service is NOT available to persons residing in, located in, or organized under the laws of countries subject to comprehensive international sanctions (EU, OFAC, UN), including but not limited to: - Cuba, Iran, North Korea, Syria - Crimea, Donetsk, and Luhansk regions - Any country or territory subject to a comprehensive embargo Access may also be restricted for residents of Russia and Belarus pursuant to applicable EU regulations. You represent and warrant that you are not listed on any sanctions list (EU Consolidated List, OFAC SDN List, UN Sanctions List) and are not controlled by any listed person or entity. Vayu reserves the right to suspend or terminate any account in violation of this section without notice or compensation.
18. Data Privacy (GDPR)
Vayu processes personal data in accordance with EU Regulation 2016/679 (GDPR) and the French Data Protection Act (Loi n. 78-17). Data processed: Privy authentication identifiers (pseudonymous), wallet addresses (pseudonymous), payment data (via Stripe), IP addresses (normalized to /48 for IPv6). Data NOT stored: CEX API credentials (transit only, never logged), wallet transaction history (streamed, never persisted server-side), passwords (managed by Privy). Your rights: access (Art. 15), rectification (Art. 16), erasure (Art. 17 via account deletion), portability (Art. 20 via CSV export), objection (Art. 21). Contact: [email]. International transfers: Some sub-processors are US-based (Privy, Stripe). Transfers are covered by the EU-US Data Privacy Framework or Standard Contractual Clauses (Decision 2021/914). Data breach: We will notify the CNIL within 72 hours (Art. 33) and affected users without undue delay if the breach poses a high risk (Art. 34). Blockchain data is public and immutable. Account deletion does not erase your transactions from the blockchain.
19. Governing Law and Jurisdiction
These Terms are governed by French law, excluding conflict of law rules and the UN Convention on Contracts for the International Sale of Goods (CISG). For professional users (B2B): Disputes shall be submitted to the Commercial Court of Paris, France. For consumers (B2C) in the EU: You may use the European Online Dispute Resolution platform at https://ec.europa.eu/consumers/odr. You retain the right to bring proceedings in the courts of your place of residence. For users in the United States: Any dispute shall be resolved by binding individual arbitration under the American Arbitration Association (AAA) rules. YOU WAIVE YOUR RIGHT TO PARTICIPATE IN A CLASS ACTION OR CLASS ARBITRATION. If this waiver is unenforceable, the entire arbitration clause is void and disputes shall be resolved in the courts of Paris, France. This clause does not deprive any consumer of the mandatory protections afforded by the law of their habitual residence (Rome I Regulation, Art. 6).
20. Miscellaneous
Severability: If any provision is found unenforceable, the remaining provisions remain in full force. The invalid provision shall be replaced by a valid provision closest to the original intent. Entire agreement: These Terms, together with the Privacy Policy, constitute the entire agreement between you and Vayu. Waiver: Failure to enforce any provision does not constitute a waiver of that provision. Assignment: Vayu may assign these Terms without your consent. You may not assign your rights or obligations. Modifications: Vayu reserves the right to modify these Terms at any time. Material changes will be notified 30 days in advance. Continued use after modifications constitutes acceptance. Current prices at the time of purchase apply regardless of subsequent price changes. Survival: Sections 2 (No Advice), 12 (Liability), 14 (Indemnification), 15 (IP), 17 (Sanctions), and 19 (Jurisdiction) survive termination. DISCLAIMER: These Terms are provided for informational purposes and do not constitute legal advice. Vayu recommends consulting a qualified legal professional for your specific situation.