{"uid":"cap_wsnhMsDOTFoMg3jWPrHy5","slug":"agent402-tools-b20-token-verifier-786491f8","name":"agent402.tools B20 Token Verifier","description":"Boolean verdict with reasons: is this address a real factory-issued B20 on Base? Checks the 0xB200 address prefix, ERC-20 readability, and whether the B20 feature set is activated on the registry. ?address=0x…","url":"https://agent402.tools/api/b20-verify","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","required":["address"],"properties":{"address":{"type":"string","description":"0x token address on Base"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["address","isB20","checks"],"properties":{"isB20":{"type":"boolean"},"checks":{"type":"object","properties":{"prefixMatch":{"type":"boolean"},"erc20Readable":{"type":"boolean"},"registryActivated":{"type":"boolean"}}},"address":{"type":"string"}}}}}}},"responseSchema":{"type":"json","example":{"isB20":false,"checks":{"prefixMatch":false,"erc20Readable":true,"registryActivated":false},"address":"0x8335…2913"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_7oABHkm2k_qu7bzASwP1S","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates whether a given Base address is a genuine factory-issued B20 token by checking the 0xB200 prefix, ERC-20 readability, and registry feature activation","exampleAgentPrompt":"Can you check if 0xB200a3925C282E21C3Ef7b6b700c6f2e19d5c9f3 is a real factory-issued B20 token on Base — I want to know if it has the right prefix, is readable as an ERC-20, and has its B20 features activated in the registry?","exampleUseCases":null,"resultDescription":"A boolean verdict indicating whether the address is a genuine factory-issued B20 token on Base, accompanied by specific reasons explaining the result — covering the 0xB200 address prefix check, ERC-20 readability, and whether the B20 feature set is activated on the registry.","failureModes":["Missing or malformed address parameter returns an error","Address that is not on Base network may fail registry lookup","Non-contract addresses (EOAs) will fail ERC-20 readability check","Network connectivity issues to Base RPC may cause lookup failures","Payment failure (insufficient USDC balance) blocks the call"],"whenToPreferThis":"Use this endpoint when you need to cryptographically and programmatically confirm that a specific Base contract address is a legitimate factory-issued B20 token — especially before integrating, trading, or interacting with an unknown token. Prefer this over manual inspection when you need a structured boolean verdict with specific failure reasons across all three validation axes: address prefix, ERC-20 interface, and registry activation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:14:05.144Z","isFirstParty":false}