{"uid":"cap_0kgawe68jm_oq58nVT-dy","slug":"m2m-sentinel-whale-signals-fb312d9b","name":"M2M Sentinel Whale Signals","description":"Who is moving size on Base right now: large ERC-20 transfers reported as observed facts with amounts and source, not as trade signals or predictions.","url":"https://api.m2msentinel.com/v1/whales/signals","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["status"],"properties":{"status":{"type":"string","const":"SUCCESS"},"signals":{"type":"array"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_WvKDpuOq2d3rQdfPHttW_","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns observations of large ERC-20 token transfers (whale movements) on the Base blockchain","exampleAgentPrompt":"Pull the latest whale signals from M2M Sentinel — I want to see any large ERC-20 transfers that have been detected on Base right now.","exampleUseCases":[{"title":"DeFi portfolio whale alert monitoring","prompt":"Check M2M Sentinel for the current large ERC-20 transfer signals on Base — I want to know if any whales are moving significant amounts that could affect my DeFi positions."},{"title":"Trading bot market impact detection","prompt":"Fetch the latest whale signals on Base from M2M Sentinel so I can factor big token movements into my trading strategy before placing any orders."},{"title":"On-chain research whale activity snapshot","prompt":"Give me a snapshot of the most recent large ERC-20 transfer observations on Base from M2M Sentinel — I'm researching whale behavior patterns for a report."}],"resultDescription":"Returns an array of whale signal objects representing observed large ERC-20 transfers on the Base network, with a SUCCESS status indicator. Each signal likely includes details such as token address, transfer amounts, sender/receiver addresses, and timestamps of the detected large transfers.","failureModes":["Payment not included or invalid — 402 Payment Required response","Rate limit exceeded — too many calls in a short window","No signals currently available — empty signals array returned with SUCCESS status","Network or upstream Base node unavailability — 503 or timeout","Malformed query parameters — 400 Bad Request"],"whenToPreferThis":"Choose this endpoint when you need real-time or near-real-time observations of large ERC-20 token transfers specifically on the Base blockchain. It is purpose-built for whale signal detection on Base, making it superior to generic blockchain explorers or multi-chain analytics APIs when Base-specific whale activity is the focus. Prefer this over DEX volume or price feeds when the primary concern is large wallet movements rather than market liquidity or pricing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:34:14.650Z","isFirstParty":false}