{"uid":"cap_TpsaWQ4FRPpW5SUJgPSCt","slug":"b20-token-safety-check-f5e712cd","name":"B20 Token Safety Check","description":"🆕 Live — B20 is Base's native precompile token standard, and unlike ERC-20 a B20 issuer can freeze holders (Policy Registry) and even SEIZE your balance (burnBlocked) at the protocol level. This reads exactly those powers — seizable, freezable, paused, rebase, uncapped-mint — into one hold/caution/avoid verdict, and says whether they are the compliance surface a tokenized stock must carry or a token merely wearing an equity ticker. The first B20-aware safety check on Base.","url":"https://402.com.tr/api/x402/b20-safety","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_hIIXc0eTbzI0VWfenfG14","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":"Checks a Base B20 token address for protocol-level powers (freeze, seize, pause, rebase, uncapped-mint) and returns a hold/caution/avoid safety verdict","exampleAgentPrompt":"Can you run a B20 safety check on the token at address 0xAbCd...1234 on Base? I want to know if the issuer can freeze holders or seize balances before I buy any.","exampleUseCases":null,"resultDescription":"A safety verdict (hold/caution/avoid) for the queried B20 token, with individual flags indicating whether the token is seizable, freezable, paused, rebasing, or has uncapped minting — summarizing the protocol-level powers the issuer holds over token holders.","failureModes":["Invalid or non-B20 token address returns an error or empty result","Address is an ERC-20 rather than B20 precompile token — results may be inapplicable","Network timeouts when querying Base chain state","Address parameter missing — API returns 400 or validation error","Token contract not yet deployed or recently removed from chain"],"whenToPreferThis":"Use this endpoint when evaluating B20 tokens on Base specifically, where standard ERC-20 safety tools miss protocol-level issuer powers like balance seizure (burnBlocked) and holder freezing via Policy Registry. Prefer this over generic token audits when the token is a Base native precompile standard token and you need to quickly assess custodial risk before investing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:32:58.945Z","isFirstParty":false}