{"id":10725,"date":"2024-12-05T09:00:00","date_gmt":"2024-12-05T08:00:00","guid":{"rendered":"https:\/\/www.blog.bim.finance\/?p=10725"},"modified":"2024-12-04T19:42:30","modified_gmt":"2024-12-04T18:42:30","slug":"quest-ce-quun-flash-loan","status":"publish","type":"post","link":"https:\/\/www.blog.bim.finance\/en\/quest-ce-quun-flash-loan\/","title":{"rendered":"Qu\u2019est ce qu\u2019un Flash loan ?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"10725\" class=\"elementor elementor-10725\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4dd4b63 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4dd4b63\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5d9bd31\" data-id=\"5d9bd31\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2aeacc2 elementor-widget elementor-widget-heading\" data-id=\"2aeacc2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Qu\u2019est-ce qu\u2019un Flash Loan et comment fonctionne-t-il ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-393feb9 elementor-widget elementor-widget-text-editor\" data-id=\"393feb9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Un flash loan est un <strong>pr\u00eat temporaire<\/strong> accord\u00e9 par un protocole DeFi comme <a href=\"https:\/\/www.blog.bim.finance\/en\/aave-aave-le-protocole-de-pret-et-demprunt-de-cryptomonnaies\/\"><strong>Aave<\/strong><\/a>, <strong>dYdX<\/strong> ou <strong>Uniswap<\/strong>. Contrairement \u00e0 un pr\u00eat traditionnel, un flash loan ne n\u00e9cessite aucune garantie (collat\u00e9ral). Il repose sur trois principes fondamentaux rendus possibles par la technologie blockchain :<\/p>\n<p><strong>Pr\u00eat et remboursement dans la m\u00eame transaction<\/strong> :<\/p>\n<ul>\n<li>Lorsqu\u2019un utilisateur emprunte des fonds via un flash loan, il doit rembourser <strong>la totalit\u00e9 du montant emprunt\u00e9 + des frais<\/strong> avant la fin de la transaction blockchain. Une transaction blockchain regroupe plusieurs \u00e9tapes, qui doivent toutes r\u00e9ussir pour que la transaction soit valid\u00e9e.<\/li>\n<li>Si l\u2019utilisateur \u00e9choue \u00e0 rembourser, <strong>toute la transaction est annul\u00e9e<\/strong>, comme si rien ne s\u2019\u00e9tait pass\u00e9.<\/li>\n<\/ul>\n<p><strong>Ex\u00e9cution par contrats intelligents (smart contracts)<\/strong> :<\/p>\n<ul>\n<li>Les flash loans utilisent des smart contracts, qui sont des programmes autonomes d\u00e9ploy\u00e9s sur une blockchain. Ces contrats d\u00e9finissent les r\u00e8gles du pr\u00eat (ex. : montant \u00e0 rembourser, frais) et s\u2019assurent qu\u2019elles sont respect\u00e9es.<\/li>\n<li>Si une \u00e9tape \u00e9choue (par exemple, le remboursement), le contrat annule toutes les actions effectu\u00e9es dans la transaction.<\/li>\n<\/ul>\n<p><strong>Nature atomique des transactions blockchain<\/strong> :<\/p>\n<ul>\n<li>Sur des blockchains comme <strong>Ethereum<\/strong>, une transaction est atomique : elle r\u00e9ussit enti\u00e8rement ou \u00e9choue compl\u00e8tement. Cela garantit que les pr\u00eateurs r\u00e9cup\u00e8rent toujours leurs fonds.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ffe78d elementor-widget elementor-widget-heading\" data-id=\"4ffe78d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Les \u00e9tapes d\u2019un Flash Loan<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d8300b0 elementor-widget elementor-widget-text-editor\" data-id=\"d8300b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Prenons un exemple concret pour comprendre les \u00e9tapes d\u2019un flash loan :<\/p>\n<ol>\n<li>\n<p><strong>Demande de pr\u00eat<\/strong> :<\/p>\n<ul>\n<li>Un utilisateur interagit avec un protocole DeFi (ex. : Aave) et demande un montant sp\u00e9cifique (par exemple, 10 000 USDC) via un flash loan.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Utilisation des fonds<\/strong> :<\/p>\n<ul>\n<li>Les fonds emprunt\u00e9s sont utilis\u00e9s pour effectuer une s\u00e9rie d\u2019op\u00e9rations pr\u00e9d\u00e9finies, comme :\n<ul>\n<li>Acheter des actifs sur une plateforme.<\/li>\n<li>Arbitrer entre plusieurs exchanges d\u00e9centralis\u00e9s (DEX).<\/li>\n<li>Rembourser une dette ou refinancer un pr\u00eat.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Remboursement<\/strong> :<\/p>\n<ul>\n<li>Avant la fin de la transaction, l\u2019utilisateur doit rembourser le montant emprunt\u00e9, major\u00e9 des frais (souvent autour de 0,09 %).<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Validation ou annulation<\/strong> :<\/p>\n<ul>\n<li>Si le remboursement est effectu\u00e9 correctement, la transaction est valid\u00e9e et inscrite sur la blockchain.<\/li>\n<li>En cas d\u2019\u00e9chec (par exemple, si les fonds restants sont insuffisants), la transaction enti\u00e8re est annul\u00e9e.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-efd5ada elementor-widget elementor-widget-heading\" data-id=\"efd5ada\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Pourquoi un Flash Loan est-il si rapide ?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7602103 elementor-widget elementor-widget-text-editor\" data-id=\"7602103\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les flash loans fonctionnent dans le cadre d\u2019une <strong>transaction blockchain unique<\/strong>, ce qui signifie que toutes les \u00e9tapes (emprunt, op\u00e9rations, remboursement) sont ex\u00e9cut\u00e9es en <strong>quelques secondes<\/strong>. Cette vitesse est possible gr\u00e2ce \u00e0 trois \u00e9l\u00e9ments cl\u00e9s :<\/p>\n<p><strong>Atomicit\u00e9 des transactions<\/strong> :<\/p>\n<ul>\n<li>Une transaction blockchain regroupe plusieurs op\u00e9rations dans un bloc unique. Ces op\u00e9rations sont ex\u00e9cut\u00e9es successivement sans interruption.<\/li>\n<\/ul>\n<p><strong>Validations simultan\u00e9es<\/strong> :<\/p>\n<ul>\n<li>Les n\u0153uds du r\u00e9seau blockchain valident l\u2019int\u00e9gralit\u00e9 de la transaction d\u2019un seul coup, incluant toutes les \u00e9tapes (pr\u00eat, op\u00e9rations, remboursement). Cela garantit qu\u2019aucune \u00e9tape ne reste inachev\u00e9e.<\/li>\n<\/ul>\n<p><strong>Automatisation via smart contracts<\/strong> :<\/p>\n<ul>\n<li>Les contrats intelligents g\u00e8rent automatiquement toutes les interactions, sans intervention humaine. Cela \u00e9vite les d\u00e9lais li\u00e9s \u00e0 des v\u00e9rifications ou approbations manuelles.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ae4831 elementor-widget elementor-widget-heading\" data-id=\"4ae4831\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">\u00c0 quoi sert un Flash Loan ? Les cas d\u2019utilisation<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dbdcff8 elementor-widget elementor-widget-text-editor\" data-id=\"dbdcff8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les flash loans sont utilis\u00e9s dans des contextes vari\u00e9s pour tirer parti de leur rapidit\u00e9 et de leur flexibilit\u00e9.<\/p>\n<h5>1. <strong>Arbitrage<\/strong><\/h5>\n<p>L\u2019arbitrage consiste \u00e0 exploiter les diff\u00e9rences de prix d\u2019un actif entre plusieurs plateformes pour g\u00e9n\u00e9rer des profits.<\/p>\n<ul>\n<li>Exemple :\n<ul>\n<li>Un token co\u00fbte 1 000 USDT sur un DEX (A) et 1 100 USDT sur un autre DEX (B).<\/li>\n<li>Avec un flash loan, un trader emprunte 100 000 USDT, ach\u00e8te 100 tokens sur A, les revend sur B pour 110 000 USDT, rembourse le pr\u00eat (100 000 + 90 USDT de frais) et conserve 9 910 USDT de b\u00e9n\u00e9fices.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5>2. <strong>Refinancement de dettes<\/strong><\/h5>\n<p>Un utilisateur peut transf\u00e9rer une dette entre deux protocoles DeFi pour profiter de meilleurs taux d\u2019int\u00e9r\u00eat.<\/p>\n<ul>\n<li>Exemple :\n<ul>\n<li>L\u2019utilisateur rembourse une dette sur Compound avec un flash loan, r\u00e9cup\u00e8re son collat\u00e9ral (ETH), d\u00e9pose ce collat\u00e9ral sur Aave et contracte une nouvelle dette pour rembourser le flash loan.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5>3. <strong>Changement de collat\u00e9ral<\/strong><\/h5>\n<p>Les flash loans permettent de modifier un collat\u00e9ral sans fermer un pr\u00eat existant.<\/p>\n<ul>\n<li>Exemple :\n<ul>\n<li>Passer d\u2019un collat\u00e9ral en BTC \u00e0 un collat\u00e9ral en stablecoins (DAI), en une seule transaction.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5>4. <strong>Cr\u00e9ation de positions \u00e0 effet de levier<\/strong><\/h5>\n<p>Un trader peut emprunter via un flash loan pour augmenter sa position sur un actif, amplifiant ainsi ses gains (mais aussi ses pertes).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4dc52dd elementor-widget elementor-widget-heading\" data-id=\"4dc52dd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">Comment emprunter avec un Flash Loan ?<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-832e00e elementor-widget elementor-widget-text-editor\" data-id=\"832e00e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Choisir une plateforme DeFi<\/strong> :<\/p>\n<ul>\n<li>Les protocoles populaires incluent <strong>Aave<\/strong>, <strong>Uniswap<\/strong>, <strong>dYdX<\/strong> ou <strong>Furucombo<\/strong>.<\/li>\n<\/ul>\n<p><strong>\u00c9crire un contrat intelligent<\/strong> :<\/p>\n<ul>\n<li>Les utilisateurs doivent coder un smart contract en <strong>Solidity<\/strong> (ou utiliser une interface simplifi\u00e9e comme Furucombo).<\/li>\n<li>Ce contrat doit inclure toutes les \u00e9tapes pr\u00e9vues : emprunt, op\u00e9rations, remboursement.<\/li>\n<\/ul>\n<p><strong>D\u00e9ployer la transaction<\/strong> :<\/p>\n<ul>\n<li>Une fois le contrat \u00e9crit, l\u2019utilisateur envoie une transaction \u00e0 la blockchain pour ex\u00e9cuter le flash loan.<\/li>\n<\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1f5724e elementor-widget elementor-widget-heading\" data-id=\"1f5724e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h5 class=\"elementor-heading-title elementor-size-default\">Quels sont les risques des Flash Loans ?<\/h5>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dbdddc8 elementor-widget elementor-widget-text-editor\" data-id=\"dbdddc8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h5>1. <strong>Attaques sur les Protocoles<\/strong><\/h5>\n<p>Les flash loans ont \u00e9t\u00e9 utilis\u00e9s dans plusieurs hacks DeFi. Les attaquants manipulent souvent les <strong>oracles de prix<\/strong> pour gonfler artificiellement la valeur d\u2019un actif, r\u00e9alisant des profits au d\u00e9triment des protocoles.<\/p>\n<h5>2. <strong>Complexit\u00e9 technique<\/strong><\/h5>\n<p>Les flash loans n\u00e9cessitent une <strong>expertise en programmation<\/strong> et une compr\u00e9hension des m\u00e9canismes blockchain. Une erreur dans le code peut entra\u00eener l\u2019\u00e9chec de la transaction.<\/p>\n<h5>3. <strong>Volatilit\u00e9 des prix<\/strong><\/h5>\n<p>En raison de la rapidit\u00e9 des transactions, m\u00eame de l\u00e9gers changements de prix peuvent rendre une op\u00e9ration d\u2019arbitrage non rentable.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e58135e elementor-widget elementor-widget-text-editor\" data-id=\"e58135e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les flash loans illustrent la puissance et la flexibilit\u00e9 de la DeFi. Ils offrent des opportunit\u00e9s uniques d\u2019arbitrage, de refinancement et d\u2019optimisation de dettes, sans n\u00e9cessiter de collat\u00e9ral ni de v\u00e9rification de solvabilit\u00e9. Cependant, ils sont r\u00e9serv\u00e9s aux utilisateurs techniquement comp\u00e9tents, capables de programmer et de comprendre les implications des smart contracts.<\/p>\n<p>Si vous d\u00e9butez, des plateformes simplifi\u00e9es comme <strong>Furucombo<\/strong> peuvent vous permettre de tester des strat\u00e9gies de flash loans sans coder. Toutefois, prudence : bien que ces pr\u00eats soient techniquement sans risque pour le pr\u00eateur, ils requi\u00e8rent une planification minutieuse pour l\u2019emprunteur.<\/p>\n<p>Les flash loans incarnent \u00e0 la fois le potentiel et les d\u00e9fis de la finance d\u00e9centralis\u00e9e. Avec une utilisation judicieuse, ils peuvent \u00eatre des outils puissants pour maximiser vos strat\u00e9gies DeFi.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Les flash loans, ou pr\u00eats flash, sont l\u2019une des innovations les plus fascinantes de la finance d\u00e9centralis\u00e9e (DeFi). Ces pr\u00eats permettent d\u2019emprunter instantan\u00e9ment des fonds sans garantie et de les rembourser dans la m\u00eame transaction blockchain. Mais comment un pr\u00eat sans garantie peut-il fonctionner en toute s\u00e9curit\u00e9 ? Comment sont-ils utilis\u00e9s ? Et pourquoi ces pr\u00eats sont-ils si rapides ? Plongeons en profondeur pour d\u00e9mystifier les flash loans.<\/p>","protected":false},"author":4,"featured_media":10731,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[7,16],"tags":[],"ppma_author":[147],"class_list":["post-10725","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blockchain","category-lexique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qu\u2019est ce qu\u2019un Flash loan ?<\/title>\n<meta name=\"description\" content=\"Que sont les Flash Loan, ces 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