{"uid":"cap_OJC_lMmtZIQTpj6Wx-ncQ","slug":"b20-token-authenticity-verifier-067ccb8f","name":"B20 Token Authenticity Verifier","description":"🆕 Run FIRST on any 'B20'. A scammer can deploy a normal contract at a vanity 0xB200… address and fake the whole B20 read surface — the B20Factory precompile is the one authority that can't be spoofed. Verifies factory registration + bytecode absence (real B20s are chain-native precompiles with no code). verdict: genuine / fake_lookalike / not_b20. The 2-cent check that keeps every other B20 answer honest.","url":"https://402.com.tr/api/x402/b20-authenticity","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"},"pathParams":{"type":"object"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","description":"Token address"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"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_q6FWynx8Oba0Mgy3jFv9a","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":"Verifies whether a given Base token address is a genuine B20 precompile or a scammer's fake lookalike by checking B20Factory registration and bytecode absence.","exampleAgentPrompt":"Can you check if the token at address 0xB200000000000000000000000000000000000001 is a genuine B20 precompile or a fake lookalike scam?","exampleUseCases":null,"resultDescription":"Returns a verdict of 'genuine', 'fake_lookalike', or 'not_b20', indicating whether the queried address is a real chain-native B20 precompile registered with the B20Factory, a spoofed contract mimicking the B20 interface, or simply not a B20 token at all.","failureModes":["Missing or invalid address parameter returns an error","Non-Base network addresses may return not_b20 or an error","Malformed address string (non-hex, wrong length) causes request failure","Service unavailability or payment failure blocks the check"],"whenToPreferThis":"Use this endpoint as the mandatory first step before trusting any B20 token data — especially before executing trades, approvals, or transfers involving a token at a 0xB200… vanity address. It is the only check that queries the authoritative B20Factory precompile, which cannot be spoofed, making it more reliable than reading the token's own state.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:46:27.642Z","isFirstParty":false}