{"id":"2fb8fa4a-7a57-4e4d-9a3f-36eb75dd023d","shortId":"tQwqhy","kind":"x402","title":"Retrieve the first transaction for a wallet address on Base via x402 micropayment.","tagline":"Retrieve the first transaction for a wallet address on Base via x402 micropayment.","description":"This x402-enabled endpoint, operated by Erudite Intelligence LLC, returns the first transaction associated with a given wallet or contract address on the Base blockchain. It is part of a suite described as \"Crypto data intelligence\" endpoints. You send a POST request with a JSON body containing an `address` field (a wallet or contract address), and receive a JSON response with the transaction data.\n\nPayment is required per-call via the x402 protocol (HTTP 402 challenge). The endpoint accepts two payment options: USDC on Base (network eip155:8453) at 10,000 base units ($0.01) per call, or USDT on Tron (network tron:728126428) at 10,000 base units ($0.01) per call. The x402 facilitator is Coinbase CDP for the Base option. Payment is settled on-chain with a maximum timeout of 300 seconds.\n\nThe provider (EruditePay Bridge) is a FinCEN MSB-registered entity (BSA ID 31000324258137) that supports x402 v2.0. The endpoint is live and returned a proper 402 challenge when probed. However, documentation is sparse — the example output schema only shows `{\"success\": true, \"data\": {}}` without detailing what fields appear in the `data` object for an actual first-transaction lookup. No OpenAPI spec or dedicated docs page was found for this specific endpoint.","tags":[],"capabilities":["wallet-first-transaction","base-chain-lookup","crypto-data-intelligence","x402-payment","usdc-base","usdt-tron","on-chain-analytics"],"categories":["crypto","blockchain-data"],"synonyms":["first transaction lookup","wallet first tx","base chain wallet history","earliest transaction","wallet genesis transaction","blockchain address first activity","on-chain first transfer"],"warnings":["Response data schema is a stub — the example output only shows an empty `data` object with no documented fields","No OpenAPI specification or dedicated documentation page found for this endpoint","The docs link (https://docs.eruditepay.com/) referenced on the landing page was not crawled and may or may not exist"],"endpointUrl":"https://bridge.eruditepay.com/api/base/wallet/first-tx","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing and a basic input/output schema. However, the response schema is essentially a stub (empty data object), there is no OpenAPI spec, and the docs URL returns a 404. The actual structure of the returned transaction data is 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'000':119,134 '10':118,133 '300':161 '31000324258137':176 '402':103,189 '728126428':131 '8453':116 'accept':107 'actual':217 'address':8,21,48,76,82 'appear':210 'associ':41 'base':10,23,51,113,120,135,148 'base chain wallet history' 'base-chain-lookup' 'blockchain':52 'blockchain address first activity' 'bodi':73 'bridg':166 'bsa':174 'call':97,124,139 'cdp':145 'chain':155 'challeng':104,190 'coinbas':144 'contain':74 'contract':47,81 'crypto':61 'crypto-data-intelligence' 'data':62,91,205,213 'dedic':226 'describ':59 'detail':207 'doc':227 'document':194 'earliest transaction' 'eip155':115 'enabl':30 'endpoint':31,64,106,182,234 'entiti':173 'erudit':34 'eruditepay':165 'exampl':198 'facilit':142 'field':77,209 'fincen':169 'first':3,16,39,219 'first transaction lookup' 'first-transact':218 'found':230 'given':44 'howev':193 'http':102 'id':175 'intellig':35,63 'json':72,86 'live':184 'llc':36 'lookup':221 'maximum':158 'micropay':13,26 'msb':171 'msb-regist':170 'network':114,129 'object':214 'on-chain':153 'on-chain first transfer' 'on-chain-analytics' 'openapi':223 'oper':32 'option':110,149 'output':199 'page':228 'part':55 'payment':92,109,150 'per':96,123,138 'per-cal':95 'post':68 'probe':192 'proper':188 'protocol':101 'provid':164 'receiv':84 'regist':172 'request':69 'requir':94 'respons':87 'retriev':1,14 'return':37,186 'schema':200 'second':162 'send':66 'settl':152 'show':202 'spars':196 'spec':224 'specif':233 'success':203 'suit':58 'support':178 'timeout':159 'transact':4,17,40,90,220 'tron':128,130 'true':204 'two':108 'unit':121,136 'usdc':111 'usdc-base' 'usdt':126 'usdt-tron' 'v2.0':180 'via':11,24,98 'wallet':7,20,45,79 'wallet first tx' 'wallet genesis transaction' 'wallet-first-transaction' 'without':206 'x402':12,25,29,100,141,179 'x402-enabled':28 'x402-payment'","prices":[{"id":"7f79a617-3df0-4272-afe2-fae33e2d314a","listingId":"2fb8fa4a-7a57-4e4d-9a3f-36eb75dd023d","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:36.993Z"}],"sources":[{"listingId":"2fb8fa4a-7a57-4e4d-9a3f-36eb75dd023d","source":"x402_bazaar","sourceId":"https://bridge.eruditepay.com/api/base/wallet/first-tx","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:36.993Z","lastSeenAt":"2026-04-22T07:32:48.246Z"}],"details":{"listingId":"2fb8fa4a-7a57-4e4d-9a3f-36eb75dd023d","quickStartSnippet":"curl -X POST https://bridge.eruditepay.com/api/base/wallet/first-tx \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"address\": \"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045\"}'","exampleRequest":{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"},"exampleResponse":{"data":{},"success":true},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 v2 challenge with USDC on Base (10000 base units) and USDT on Tron (10000 base units)","source_url":"https://bridge.eruditepay.com/api/base/wallet/first-tx"},{"claim":"Provider is Erudite Intelligence LLC, FinCEN MSB registered with BSA ID 31000324258137","source_url":"https://bridge.eruditepay.com"},{"claim":"x402 facilitator for Base payment is Coinbase CDP (https://api.cdp.coinbase.com/platform/v2/x402)","source_url":"https://bridge.eruditepay.com/api/base/wallet/first-tx"},{"claim":"Endpoint description is 'Crypto data intelligence'","source_url":"https://bridge.eruditepay.com/api/base/wallet/first-tx"},{"claim":"USDC uses 6 decimals, so 10000 base units = $0.01","source_url":"https://bridge.eruditepay.com/api/base/wallet/first-tx"}],"useCases":["Determine when a wallet address first transacted on Base for KYC/AML age-of-wallet checks","Build wallet reputation scores by identifying the earliest on-chain activity","Investigate wallet provenance by finding the first transaction for forensic analysis","Automate agent-driven blockchain research workflows with per-call micropayments"],"bestFor":["AI agents needing on-demand wallet intelligence with no subscription","Compliance tools checking wallet age on Base","Blockchain analytics pipelines requiring first-transaction metadata"],"notFor":["Bulk historical transaction export for thousands of wallets (per-call pricing adds up)","Non-Base chains — this endpoint is specifically for Base wallet data","Users who need full transaction history rather than just the first transaction"],"kindDetails":{},"updatedAt":"2026-04-22T02:11:13.508Z"}}