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WFN QUICK BRIEF · UNDER 1 MIN
The short version
MODE 2 OF 2
What the primary record establishes
ERC-3156 is a Final standard created on 15 November 2020 for single-asset flash-loan interfaces. It describes temporary access to borrowed tokens with principal and any applicable fee returned before the transaction ends. Ethereum EIPs — ERC-3156: Flash Loans, Final ↗
What the distinction changes
The defining horizon is one transaction, rather than a number of seconds or an overnight credit period. A failed repayment causes the transaction to revert under the specified process; it is not an ordinary overdue balance.
What to check before drawing a conclusion
WFN would inspect the actual lender, supported asset, quoted fee and callback validation before interpreting a successful simulation. A simulation describes a particular state and cannot guarantee identical conditions in a later block.
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WFN STORY COMPASS
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Original WFN vector illustrationWFN · 23 October 2026
Editorial noteSource-based explanation with original WFN analysis. Historical records retain their dates; numerical examples are illustrative. The original vector illustration is conceptual and is not documentary evidence.
WFN REALITY LEDGER
What is on the record?
Primary-source explainer
Primary-source explainer
Primary record / reference periodERC-3156, created 15 November 2020; Final status checked 23 October 2026
The linked source supports the documented record; WFN interpretation and illustrative examples are separate.
The standard describes a loan that returns principal and any fee within one transaction. Atomic repayment does not establish a profitable strategy.
01 · VERIFIED RECORD
What the primary record establishes
ERC-3156 is a Final standard created on 15 November 2020 for single-asset flash-loan interfaces. It describes temporary access to borrowed tokens with principal and any applicable fee returned before the transaction ends. Ethereum EIPs — ERC-3156: Flash Loans, Final ↗
The lender invokes the receiver’s callback and checks the required return value. The specification also distinguishes capacity from pricing: maxFlashLoan returns zero for an unsupported token, while flashFee must revert for an unsupported token. Ethereum EIPs — ERC-3156: Flash Loans, Final ↗
02 · WFN EDITORIAL ANALYSIS
What the distinction changes
The defining horizon is one transaction, rather than a number of seconds or an overnight credit period. A failed repayment causes the transaction to revert under the specified process; it is not an ordinary overdue balance.
This atomic structure addresses repayment within execution. It does not guarantee that a sequence of swaps or other actions creates value. Execution costs, fees and the prices available when the transaction runs still affect the result.
03 · REVIEW POINTS
What to check before drawing a conclusion
WFN would inspect the actual lender, supported asset, quoted fee and callback validation before interpreting a successful simulation. A simulation describes a particular state and cannot guarantee identical conditions in a later block.
The source is an interface standard, not an investment performance record. A report should distinguish compatibility with ERC-3156 from a security assessment of a deployed contract and from evidence that a proposed transaction is economically worthwhile.
