{"uid":"cap_ciKDrQOrQcVoe4amH4j0U","slug":"agent402-uk-crypto-address-validator-d630f1bb","name":"Agent402 UK Crypto Address Validator","description":"Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.","url":"https://agent402.co.uk/v1/validate/crypto-address","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"chain":{"type":"string","description":"auto|eth|sol|btc"},"address":{"type":"string","description":"Address string"}}},"responseSchema":{"type":"json","example":{"chain":"eth","valid":true,"checksummed":"0x9EF9…"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3nSGBTYlaBLisymg1FDbB","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates cryptocurrency wallet addresses for ETH (EIP-55 checksum), Solana (base58-32), and Bitcoin (Base58Check, bech32, bech32m) formats with automatic or explicit chain detection.","exampleAgentPrompt":"Can you validate this Ethereum address for me — 0x9EF9f5b12b1B24Ea99D4B2eEF4C71B7e3B85f2a — and make sure the checksum is correct?","exampleUseCases":[{"title":"Pre-flight DeFi transaction check","prompt":"Before I send any funds, check if this address is a valid Ethereum wallet: 0xAbCdEf1234567890AbCdEf1234567890AbCdEf12 — auto-detect the chain."},{"title":"Bitcoin withdrawal address verification","prompt":"I need to verify that bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq is a valid Bitcoin address before we process the withdrawal."},{"title":"Multi-chain address routing in agent pipeline","prompt":"We're building a payment router — can you check whether FwR3PbjS5LabJptzT9tEMEpHyJqbBzFhLPLtbGepMgQa is a valid Solana address or should I try a different chain?"}],"resultDescription":"Returns a JSON object containing the detected or specified chain name, a boolean valid field indicating whether the address is correctly formatted, and (for Ethereum addresses) the EIP-55 checksummed version of the address.","failureModes":["Address is malformed or contains invalid characters — returns valid: false","Unsupported chain specified — may return an error or valid: false","Bech32m vs bech32 mismatch for Bitcoin segwit addresses — flagged as invalid","Empty or null address field — likely returns validation error","Chain mismatch when chain is explicitly set but address format belongs to a different chain"],"whenToPreferThis":"Choose this endpoint when your agent needs authoritative, multi-format address validation covering ETH (EIP-55 checksum), Solana (base58-32), and Bitcoin (Base58Check + bech32/bech32m) in a single call with auto-detection. It is ideal for pre-transaction guard rails in DeFi workflows, payment routing pipelines, or any multi-chain agent that must reject malformed addresses before committing funds. Prefer it over hand-rolled regex checks or single-chain validators when you need correctness guarantees across all three major chains at negligible cost ($0.001/call).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T10:28:21.106Z","isFirstParty":false}