{"investigation":{"slug":"yam-finance","entity_name":"YAM Finance","trust_score":28,"severity_base":null,"score_modifier":0,"confidence":0.87,"status":"published","content_type":"investigation","summary":"YAM Finance was an experimental DeFi rebase protocol launched on August 11, 2020 after only ten days of development and without a formal security audit. A single missing division operator in the rebase function caused the protocol to mint an astronomical surplus of YAM tokens to its treasury, rendering on-chain governance permanently inoperable within roughly 35 hours of launch; a community rescue attempt failed and approximately $750,000 in yCRV tokens were permanently locked. The protocol was subsequently relaunched as YAMv2 and YAMv3 following a PeckShield audit, but never recovered its initial market position or community trust.","sections":[{"content":"YAM Finance described itself as a 'monetary experiment' combining elements from Ampleforth (elastic supply rebasing), Compound (governance), and Yearn Finance (treasury yield). It was conceived and built in approximately ten days by a five-person founding team — Brock Elmore, Trent Elmore, Clinton Bembry, Will Price, and Dan Elitzer — with no pre-mine, no venture capital backing, and no founder token allocation. The protocol launched on August 11, 2020 at 7:00 PM UTC with an initial supply of 5 million YAM and a stated peg target of $1 USD. It attracted over $400 million in total value locked within 24 hours, and by August 12 at approximately 4:30 PM UTC, TVL had reached roughly $580 million. The YAM token itself — despite a design intended to hold a $1 peg via elastic supply adjustments — surged to an all-time high of approximately $167 on August 12. The founding team explicitly acknowledged in its launch announcement that the codebase had not been audited and characterized the protocol as experimental; these warnings did not temper speculative demand during the broader 'DeFi summer' of 2020.","heading":"Protocol Overview and Launch Hype","sources":[{"url":"https://medium.com/yam-finance/yam-finance-d0ad577250c7","name":"YAM: An Experiment in Fair Farming, Governance, and Elasticity — Yam Finance Medium","type":"official","credibility":2},{"url":"https://www.coindesk.com/tech/2020/08/12/deposits-in-monetary-experiment-meme-token-yam-break-460m","name":"Deposits in 'Monetary Experiment' Meme Token YAM Break $460M — CoinDesk","type":"news_article","credibility":1},{"url":"https://chainbulletin.com/the-full-story-yam-finances-rise-fall-rise-again","name":"The Full Story: Yam Finance's Rise & Fall & Rise Again — Chain Bulletin","type":"news_article","credibility":2},{"url":"https://decrypt.co/38430/a-defi-farmer-pumped-11-million-into-unaudited-platform-yam","name":"A DeFi farmer pumped $11 million into unaudited platform Yam — Decrypt","type":"news_article","credibility":2}],"severity":"medium"},{"content":"At approximately 6:00 PM UTC on August 12, 2020 — roughly 23 hours after launch — the YAM team discovered a critical vulnerability in the protocol's rebase function inside YAM.sol. The bug consisted of a single missing division operation: the deployed code read `totalSupply = initSupply.mul(yamsScalingFactor)` when the correct formula should have been `totalSupply = initSupply.mul(yamsScalingFactor).div(BASE)`. The omitted `.div(BASE)` step caused every rebase call after the first to exponentially mint orders of magnitude more YAM tokens than intended, routing the excess supply directly into the protocol's governance reserve. Because the governance module calculated quorum thresholds relative to total token supply, the artificially inflated reserve balance made it mathematically impossible to ever reach the participation threshold required to pass any governance proposal. Security researcher James Prestwich of Summa summarized the consequence: 'Because they exist and can't vote, it's impossible to ever meet the minimum voter participation. This means governance is permanently disabled.' The protocol's codebase had received no professional security audit prior to launch; the GitHub repository acknowledged only informal 'spot checked' review by a small number of developers. CertiK's post-mortem analysis confirmed the root cause and mechanism of the failure.","heading":"The Critical Bug: Missing Division Operator","sources":[{"url":"https://www.certik.com/resources/blog/yam-finance-smart-contract-bug-analysis-future-prevention","name":"YAM Finance Smart Contract Bug Analysis & Future Prevention — CertiK","type":"research","credibility":2},{"url":"https://www.theregister.com/2020/08/13/yam_cryptocurrency_bug_governance/","name":"Single-line software bug causes fledgling YAM cryptocurrency to implode just two days after launch — The Register","type":"news_article","credibility":1},{"url":"https://www.coindesk.com/markets/2020/08/13/defi-meme-coin-yam-succumbs-to-fatal-rebase-bug-makes-plans-for-yam-20","name":"DeFi Meme Coin YAM Succumbs to Fatal Rebase Bug, Makes Plans for YAM 2.0 — CoinDesk","type":"news_article","credibility":1},{"url":"https://decrypt.co/38510/overnight-defi-success-yam-finance-alerts-users-bug","name":"Overnight DeFi success Yam Finance alerts users to bug — Decrypt","type":"news_article","credibility":2}],"severity":"critical"},{"content":"Upon discovering the bug on August 12, the YAM team immediately appealed to the community for an emergency governance intervention. To submit a corrective proposal before the next scheduled rebase at 8:00 AM UTC on August 13, holders needed to delegate at least 160,000 YAM — requiring a threshold of approximately 35,000 YAM to propose and 140,000 to activate, with a mandatory 12.5-hour waiting period between stages. The community mobilized rapidly across social media, and the required delegation threshold was met; a governance proposal was successfully submitted by approximately 7:00 AM UTC on August 13. However, shortly after submission, security experts determined that the rebaser bug would interact with the governance module itself in a way that prevented the proposal from executing correctly. The smart contract designed to implement the fix was also found to be flawed. YAM co-founder Brock Elmore publicly acknowledged the failure, posting 'i'm sorry everyone. i've failed.' on social media. The rescue attempt collapsed, governance remained permanently disabled, and the protocol team formally announced the project's failure early on August 13. Approximately 75% of the YAM/yCRV Uniswap V2 pool liquidity was reportedly withdrawn by participants before a second rebase occurred, but the remaining yCRV tokens held in the protocol treasury — estimated at approximately $750,000 — were permanently locked with no mechanism for recovery.","heading":"The Failed Rescue Attempt","sources":[{"url":"https://medium.com/yam-finance/yam-post-rescue-attempt-update-c9c90c05953f","name":"YAM Post-Rescue Attempt Update — Yam Finance Medium","type":"official","credibility":2},{"url":"https://cointelegraph.com/news/five-hours-to-failure-the-save-yam-proposal-is-falling-short","name":"Five Hours to Failure: The 'Save Yam' Proposal Is Falling Short — CoinTelegraph","type":"news_article","credibility":2},{"url":"https://coingeek.com/defi-strikes-again-yam-protocol-bug-leads-to-750000-loss/","name":"DeFi strikes again: YAM protocol bug leads to $750,000 loss — CoinGeek","type":"news_article","credibility":2},{"url":"https://cryptobriefing.com/yam-finance-defi-experiment-comes-to-a-grinding-halt/","name":"The Yam Finance DeFi Experiment Comes to a Grinding Halt — Crypto Briefing","type":"news_article","credibility":2}],"severity":"critical"},{"content":"Following the bug announcement on the evening of August 12, the YAM token price fell precipitously from approximately $167 at its peak to around $14 by midnight UTC on August 13. When the rescue proposal was confirmed to have failed on the morning of August 13, the price collapsed further to below $1 — representing a decline of over 99% from peak within approximately 35 hours of launch. Market capitalization dropped from a peak of nearly $475–$585 million (figures vary by source and timing) to roughly $19.5 million in a matter of minutes following the failure announcement. The YAM/yCRV Uniswap V2 liquidity pool was declared permanently unsafe, as any remaining liquidity was exposed to the broken rebasing mechanism with no governance remedy available. Individual investors who had deposited funds into the Uniswap pool after the bug disclosure suffered losses on the liquidity they were unable to withdraw before the second rebase. The rapid collapse was widely covered as a cautionary example of the risks posed by unaudited DeFi protocols during the 2020 yield-farming boom.","heading":"Price Collapse and Market Impact","sources":[{"url":"https://www.trustnodes.com/2020/08/13/yam-crashes-98-79-governance-cant-save-project-abandoned-yam2-coming","name":"Yam Crashes 98.79%, Governance Can't Save, Project Abandoned, Yam2 Coming — TrustNodes","type":"news_article","credibility":2},{"url":"https://coinjournal.net/news/yam-has-crashed-by-99-after-security-flaw-was-found/","name":"YAM Token Price Crashes 99.9% To Hit $0.6 — CoinJournal","type":"news_article","credibility":2},{"url":"https://www.coindesk.com/markets/2020/08/13/defi-meme-coin-yam-succumbs-to-fatal-rebase-bug-makes-plans-for-yam-20","name":"DeFi Meme Coin YAM Succumbs to Fatal Rebase Bug, Makes Plans for YAM 2.0 — CoinDesk","type":"news_article","credibility":1},{"url":"https://quadrigainitiative.com/casestudy/yamincident.php","name":"Aug 2020 YAM Finance Incident — Quadriga Initiative Case Study","type":"research","credibility":2}],"severity":"critical"},{"content":"Despite the collapse of the original protocol, the founding team and a core community organized a successor path. On August 19, 2020, a Phase 1 migration was executed: holders of the original (v1) YAM token could burn their tokens in exchange for YAMv2 tokens via a migration contract audited by PeckShield Inc. YAMv2 served as an interim governance token with no rebase mechanism, allowing community members to vote on parameters for a fully functional v3 deployment. The community voted to change the protocol's reserve asset to yUSD, extend the governance voting period to two days, and adjust quorum and proposal thresholds. PeckShield completed a 3.5 person-week audit of the YAMv3 codebase in the week of August 31, 2020, identifying 17 basic coding issues, 12 advanced DeFi logic concerns (four informational, four medium-risk, one high-risk), and six recommendations; all identified issues were reported as resolved prior to launch. YAMv3 launched on September 18, 2020, with a 1:1 migration from YAMv2 (50% immediately liquid, 50% vested over 30 days). The audit was funded via a Gitcoin grant. Despite the structured relaunch, YAMv3 did not recapture the scale of the original launch's TVL or community attention, and the protocol's long-term development stalled relative to competing DeFi projects.","heading":"Relaunch as YAMv2 and YAMv3","sources":[{"url":"https://medium.com/yam-finance/yam-replanting-migration-and-launch-997b4848b8d8","name":"YAM Replanting: Migration and Launch — Yam Finance Medium","type":"official","credibility":2},{"url":"https://defiye.com/2020/09/yam-v3-to-launch-on-friday-after-detailed-audit-by-peckshield/","name":"Yam V3 to Launch on Friday After Detailed Audit by PeckShield — Defiye","type":"news_article","credibility":3},{"url":"https://cointelegraph.com/news/yam-finance-readies-for-less-disastrous-relaunch","name":"Yam Finance readies for less-disastrous relaunch — CoinTelegraph","type":"news_article","credibility":2},{"url":"https://github.com/yam-finance/yamV3/blob/master/PeckShield-Audit-Report-YAMv3-v1.0.pdf","name":"PeckShield Audit Report YAMv3 — GitHub (yam-finance/yamV3)","type":"research","credibility":2}],"severity":"medium"},{"content":"The YAM Finance incident is cited extensively in DeFi security literature as a canonical example of the systemic risks introduced by unaudited smart contract deployments, particularly those that interlock financial mechanics with on-chain governance. The ten-day development timeline with no professional audit, combined with the protocol's rapid accumulation of hundreds of millions of dollars in user funds, created conditions where a single-line coding error resulted in permanent protocol failure and user losses. The interaction between the rebase function and the governance module created a compound failure mode: the bug not only minted excess tokens but simultaneously neutralized the only mechanism by which the community could have corrected the flaw. The incident prompted broad industry discussion about minimum audit standards for DeFi protocols, the ethics of launching unaudited systems while disclosing risk in fine print, and the adequacy of on-chain governance as a sole safety mechanism. No regulatory action by the SEC, CFTC, or other government body has been identified in connection with YAM Finance's original launch or collapse. The $750,000 locked in the treasury is not recoverable under the v1 protocol.","heading":"Risk Factors and Lessons","sources":[{"url":"https://www.certik.com/resources/blog/yam-finance-smart-contract-bug-analysis-future-prevention","name":"YAM Finance Smart Contract Bug Analysis & Future Prevention — CertiK","type":"research","credibility":2},{"url":"https://immunebytes.com/blog/yam-finance-made-a-mistake-you-can-avoid-it/","name":"YAM Finance Made a Mistake! You Can Avoid It — ImmuneBytes","type":"research","credibility":2},{"url":"https://www.theregister.com/2020/08/13/yam_cryptocurrency_bug_governance/","name":"Single-line software bug causes fledgling YAM cryptocurrency to implode — The Register","type":"news_article","credibility":1},{"url":"https://finematics.com/yam-explained/","name":"Meteoric Rise and Fall of YAM — Finematics","type":"news_article","credibility":2}],"severity":"high"}],"timeline":[{"date":"2020-08","event":"YAM Finance team coalesces in a chat group; development begins on what would become a ten-day build from conception to launch.","source":"The Defiant — Yam Finance Backstory","source_url":"https://thedefiant.io/it-was-exciting-but-also-terrifying-yam-finances-backstory","date_original":"2020-08-01"},{"date":"2020-08-11","event":"YAM Finance protocol launches at 7:00 PM UTC with 5 million YAM tokens, no pre-mine, no audit. Launch announcement explicitly warns the code has not been audited.","source":"Yam Finance Medium — YAM launch announcement","source_url":"https://medium.com/yam-finance/yam-finance-d0ad577250c7"},{"date":"2020-08-12","event":"TVL surpasses $460 million within the first 17 hours of launch; YAM token peaks near $167, far above its intended $1 peg.","source":"CoinDesk — Deposits in Monetary Experiment Meme Token YAM Break $460M","source_url":"https://www.coindesk.com/tech/2020/08/12/deposits-in-monetary-experiment-meme-token-yam-break-460m"},{"date":"2020-08-12","event":"At approximately 6:00 PM UTC, the YAM team discovers a critical bug in the rebase function: a missing .div(BASE) operation causes exponential over-minting of YAM to the governance treasury, permanently disabling quorum.","source":"Yam Finance Medium — YAM Post-Rescue Attempt Update","source_url":"https://medium.com/yam-finance/yam-post-rescue-attempt-update-c9c90c05953f"},{"date":"2020-08-12","event":"YAM price drops from ~$167 to ~$14 following the bug announcement. The team calls for emergency community governance action.","source":"Chain Bulletin — The Full Story: Yam Finance's Rise & Fall & Rise Again","source_url":"https://chainbulletin.com/the-full-story-yam-finances-rise-fall-rise-again"},{"date":"2020-08-13","event":"Community assembles 160,000+ delegated YAM and submits emergency governance proposal by approximately 7:00 AM UTC. Shortly after, security experts confirm the rebaser bug interacts with the governance module to prevent the proposal from succeeding.","source":"CoinTelegraph — Five Hours to Failure: The Save Yam Proposal Is Falling Short","source_url":"https://cointelegraph.com/news/five-hours-to-failure-the-save-yam-proposal-is-falling-short"},{"date":"2020-08-13","event":"Rescue attempt officially declared a failure. YAM co-founder Brock Elmore acknowledges the outcome publicly. YAM price collapses to below $1, more than 99% below its peak. ~$750,000 in yCRV permanently locked in treasury.","source":"CoinDesk — DeFi Meme Coin YAM Succumbs to Fatal Rebase Bug","source_url":"https://www.coindesk.com/markets/2020/08/13/defi-meme-coin-yam-succumbs-to-fatal-rebase-bug-makes-plans-for-yam-20"},{"date":"2020-08-19","event":"Phase 1 migration executes: original YAM token holders can burn v1 tokens for YAMv2 via a PeckShield-audited migration contract.","source":"Chain Bulletin — The Full Story: Yam Finance's Rise & Fall & Rise Again","source_url":"https://chainbulletin.com/the-full-story-yam-finances-rise-fall-rise-again"},{"date":"2020-08-31","event":"PeckShield begins a 3.5 person-week security audit of the YAMv3 codebase, funded by a Gitcoin grant.","source":"Yam Finance Medium — YAM Replanting: Migration and Launch","source_url":"https://medium.com/yam-finance/yam-replanting-migration-and-launch-997b4848b8d8"},{"date":"2020-09-10","event":"PeckShield audit of YAMv3 completes, identifying 17 basic coding issues and 12 advanced DeFi logic concerns including one high-risk item; all issues reported as resolved.","source":"Defiye — Yam V3 to Launch on Friday After Detailed Audit by PeckShield","source_url":"https://defiye.com/2020/09/yam-v3-to-launch-on-friday-after-detailed-audit-by-peckshield/"},{"date":"2020-09-18","event":"YAMv3 launches. YAMv2 holders migrate 1:1 (50% liquid immediately, 50% vested over 30 days). Liquidity incentives for YAM/yUSD pair go live the following day.","source":"CryptoTicker — YAM v3 Relaunch On Sep 18","source_url":"https://cryptoticker.io/en/yam-v3-relaunch/"}],"sources_used":[{"url":"https://medium.com/yam-finance/yam-finance-d0ad577250c7","name":"YAM: An Experiment in Fair Farming, Governance, and Elasticity — Yam Finance Medium","type":"official","archive_url":"http://web.archive.org/web/20251203103134/https://medium.com/yam-finance/yam-finance-d0ad577250c7","credibility":2,"archive_timestamp":"2025-12-03T10:31:34+00:00"},{"url":"https://medium.com/yam-finance/yam-post-rescue-attempt-update-c9c90c05953f","name":"YAM Post-Rescue Attempt Update — Yam Finance Medium","type":"official","archive_url":"http://web.archive.org/web/20260725130804/https://medium.com/yam-finance/yam-post-rescue-attempt-update-c9c90c05953f","credibility":2,"archive_timestamp":"2026-07-25T13:08:04+00:00"},{"url":"https://www.coindesk.com/tech/2020/08/12/deposits-in-monetary-experiment-meme-token-yam-break-460m","name":"Deposits in Monetary Experiment Meme Token YAM Break $460M — CoinDesk","type":"news_article","archive_url":"http://web.archive.org/web/20260725131605/https://www.coindesk.com/tech/2020/08/12/deposits-in-monetary-experiment-meme-token-yam-break-460m","credibility":1,"archive_timestamp":"2026-07-25T13:16:05+00:00"},{"url":"https://www.coindesk.com/markets/2020/08/13/defi-meme-coin-yam-succumbs-to-fatal-rebase-bug-makes-plans-for-yam-20","name":"DeFi Meme Coin YAM Succumbs to Fatal Rebase Bug, Makes Plans for YAM 2.0 — CoinDesk","type":"news_article","archive_url":"https://web.archive.org/web/20260725095053/https://www.coindesk.com/markets/2020/08/13/defi-meme-coin-yam-succumbs-to-fatal-rebase-bug-makes-plans-for-yam-20","credibility":1,"archive_timestamp":"2026-07-25T09:50:53+00:00"},{"url":"https://www.theregister.com/2020/08/13/yam_cryptocurrency_bug_governance/","name":"Single-line software bug causes fledgling YAM cryptocurrency to implode — The Register","type":"news_article","archive_url":"http://web.archive.org/web/20260408165317/https://www.theregister.com/2020/08/13/yam_cryptocurrency_bug_governance/","credibility":1,"archive_timestamp":"2026-04-08T16:53:17+00:00"},{"url":"https://cointelegraph.com/news/five-hours-to-failure-the-save-yam-proposal-is-falling-short","name":"Five Hours to Failure: The Save Yam Proposal Is Falling Short — CoinTelegraph","type":"news_article","archive_url":"http://web.archive.org/web/20260116132200/https://cointelegraph.com/news/five-hours-to-failure-the-save-yam-proposal-is-falling-short","credibility":2,"archive_timestamp":"2026-01-16T13:22:00+00:00"},{"url":"https://decrypt.co/38510/overnight-defi-success-yam-finance-alerts-users-bug","name":"Overnight DeFi success Yam Finance alerts users to bug — Decrypt","type":"news_article","archive_url":"http://web.archive.org/web/20260519125004/https://decrypt.co/38510/overnight-defi-success-yam-finance-alerts-users-bug","credibility":2,"archive_timestamp":"2026-05-19T12:50:04+00:00"},{"url":"https://decrypt.co/38430/a-defi-farmer-pumped-11-million-into-unaudited-platform-yam","name":"A DeFi farmer pumped $11 million into unaudited platform Yam — Decrypt","type":"news_article","archive_url":"https://web.archive.org/web/20260724223611/https://decrypt.co/38430/a-defi-farmer-pumped-11-million-into-unaudited-platform-yam","credibility":2,"archive_timestamp":"2026-07-24T22:36:11+00:00"},{"url":"https://www.certik.com/resources/blog/yam-finance-smart-contract-bug-analysis-future-prevention","name":"YAM Finance Smart Contract Bug Analysis & Future Prevention — CertiK","type":"research","archive_url":"http://web.archive.org/web/20251016153430/https://www.certik.com/resources/blog/yam-finance-smart-contract-bug-analysis-future-prevention","credibility":2,"archive_timestamp":"2025-10-16T15:34:30+00:00"},{"url":"https://coingeek.com/defi-strikes-again-yam-protocol-bug-leads-to-750000-loss/","name":"DeFi strikes again: YAM protocol bug leads to $750,000 loss — CoinGeek","type":"news_article","archive_url":"http://web.archive.org/web/20260209060759/https://coingeek.com/defi-strikes-again-yam-protocol-bug-leads-to-750000-loss/","credibility":2,"archive_timestamp":"2026-02-09T06:07:59+00:00"},{"url":"https://chainbulletin.com/the-full-story-yam-finances-rise-fall-rise-again","name":"The Full Story: Yam Finance's Rise & Fall & Rise Again — Chain Bulletin","type":"news_article","archive_url":"http://web.archive.org/web/20260218024009/https://chainbulletin.com/the-full-story-yam-finances-rise-fall-rise-again","credibility":2,"archive_timestamp":"2026-02-18T02:40:09+00:00"},{"url":"https://www.trustnodes.com/2020/08/13/yam-crashes-98-79-governance-cant-save-project-abandoned-yam2-coming","name":"Yam Crashes 98.79%, Governance Can't Save, Project Abandoned, Yam2 Coming — TrustNodes","type":"news_article","archive_url":"https://web.archive.org/web/20260725102932/https://www.trustnodes.com/2020/08/13/yam-crashes-98-79-governance-cant-save-project-abandoned-yam2-coming","credibility":2,"archive_timestamp":"2026-07-25T10:29:32+00:00"},{"url":"https://coinjournal.net/news/yam-has-crashed-by-99-after-security-flaw-was-found/","name":"YAM Token Price Crashes 99.9% To Hit $0.6 — CoinJournal","type":"news_article","archive_url":"https://web.archive.org/web/20260724220956/https://coinjournal.net/news/malaysian-police-arrest-crypto-miners-for-stealing-electricity/?dynamic","credibility":2,"archive_timestamp":"2026-07-24T22:09:56+00:00"},{"url":"https://cryptobriefing.com/yam-finance-defi-experiment-comes-to-a-grinding-halt/","name":"The Yam Finance DeFi Experiment Comes to a Grinding Halt — Crypto Briefing","type":"news_article","archive_url":"http://web.archive.org/web/20260420003431/https://cryptobriefing.com/yam-finance-defi-experiment-comes-to-a-grinding-halt/","credibility":2,"archive_timestamp":"2026-04-20T00:34:31+00:00"},{"url":"https://medium.com/yam-finance/yam-replanting-migration-and-launch-997b4848b8d8","name":"YAM Replanting: Migration and Launch — Yam Finance Medium","type":"official","archive_url":null,"credibility":2,"archive_error":"error:no-request","archive_status":"unarchivable","archive_timestamp":null},{"url":"https://cointelegraph.com/news/yam-finance-readies-for-less-disastrous-relaunch","name":"Yam Finance readies for less-disastrous relaunch — 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You Can Avoid It — ImmuneBytes","type":"research","archive_url":"http://web.archive.org/web/20260208141525/https://immunebytes.com/blog/yam-finance-made-a-mistake-you-can-avoid-it/","credibility":2,"archive_timestamp":"2026-02-08T14:15:25+00:00"}],"source_tags":[],"addresses":[],"reviewed":false,"reviewed_by":null,"model_used":"claude-sonnet-4-5","created_at":"2026-05-30T12:59:03.466632+00:00","updated_at":"2026-08-29T01:32:56.947+00:00"}}