{"uid":"cap_QeoOVT6BnAcpDrFJ4a0CM","slug":"402-com-tr-b20-token-metadata-reader-bb40ff5a","name":"402.com.tr B20 Token Metadata Reader","description":"🆕 A B20 with a METADATA_ROLE holder can call updateName/updateSymbol — change its own identity after launch (an impersonation / bait-and-switch vector ERC-20 has no protocol equivalent for). Reads whether the metadata is mutable (role holder exists) AND whether it has ALREADY been renamed on-chain (NameUpdated/SymbolUpdated history). Trust the address, not the label.","url":"https://402.com.tr/api/x402/b20-metadata","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":"B20 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":"0.04","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":"$0.04/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_wwCdP2k8J7dd_E_XPqGlW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.04","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Reads on-chain metadata for a B20 token including name, symbol, mutability status, and rename history to detect impersonation or bait-and-switch risks","exampleAgentPrompt":"Can you check the metadata for B20 token at address 0xAbC123... on Base — specifically whether its name or symbol has ever been changed on-chain and whether anyone holds the METADATA_ROLE that could rename it again?","exampleUseCases":null,"resultDescription":"Returns the current name and symbol of the B20 token, whether the metadata is mutable (presence of a METADATA_ROLE holder), and the full on-chain history of NameUpdated and SymbolUpdated events so the agent can detect if the token has ever been renamed since deployment.","failureModes":["Invalid or missing token address returns an error","Non-B20 ERC-20 address may return partial or empty metadata","Network errors or RPC unavailability may cause timeouts","Address that is not a contract returns an error or empty result"],"whenToPreferThis":"Use this endpoint when you need to verify the identity integrity of a B20 token on Base — specifically to check if its name/symbol have changed since launch (bait-and-switch risk) or if a METADATA_ROLE holder exists who could rename it in the future. Prefer this over generic ERC-20 metadata calls when auditability of rename history and mutability status is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:06:20.974Z","isFirstParty":false}