{"id":"4d985797-337d-4b1c-9cf0-411a2e724e26","shortId":"YSmLvb","kind":"x402","title":"Look up pending Base mempool transactions by hash via x402 micropayment","tagline":"Look up pending Base mempool transactions by hash via x402 micropayment","description":"This endpoint, operated by Erudite Intelligence LLC, returns pending mempool data for the Base blockchain (eip155:8453). You submit a transaction hash via POST and receive intelligence about its pending status. The endpoint is gated by the x402 protocol (v2) and accepts payment in USDC on Base (0.01 USDC per call) or USDT on Tron (0.01 USDT per call). Settlement is facilitated through the EruditePay x402 Bridge, which supports 20 blockchains.\n\nThe request body takes a JSON object with a single field: `hash`, a transaction hash string. The response returns a JSON object with a `success` boolean and a `data` object containing the mempool details. The endpoint description in the x402 challenge is simply \"Crypto data intelligence,\" so the exact fields returned in the `data` object are not fully documented. The provider is FinCEN MSB registered (BSA ID 31000324258137) and operates non-custodially.\n\nDocumentation is sparse — the /docs path returns a 404, and the Bazaar schema extension provides only a minimal example with an empty `data` object. The endpoint is live and returning a proper 402 challenge, but without richer documentation or example responses, the precise scope of mempool data returned remains unclear.","tags":[],"capabilities":["mempool-lookup","pending-transaction-query","base-chain","x402-payment","usdc-payment","usdt-tron-payment","crypto-data-intelligence","transaction-hash-lookup"],"categories":["blockchain","crypto-data"],"synonyms":["mempool pending transactions","base mempool","transaction status","pending tx lookup","blockchain mempool API","base chain mempool","crypto transaction tracker","unconfirmed transactions"],"warnings":["No dedicated documentation available — /docs returns 404","Example response in Bazaar schema shows empty data object; actual response fields are undocumented","Endpoint description is generic ('Crypto data intelligence') and does not detail what mempool fields are returned","Provider landing page is primarily about the x402 facilitator bridge, not this specific data endpoint"],"endpointUrl":"https://bridge.eruditepay.com/v1/base/mempool/pending","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","amount":"1000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 v2 challenge with clear pricing and a Bazaar schema extension. However, documentation is effectively absent (/docs returns 404), the example response contains an empty data object, and the actual fields returned for a real pending transaction are unknown. The description 'Crypto data intelligence' is 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'0.01':70,78 '20':92 '31000324258137':161 '402':199 '404':175 '8453':39 'accept':64 'base':4,15,36,69 'base chain mempool' 'base mempool' 'base-chain' 'bazaar':178 'blockchain':37,93 'blockchain mempool API' 'bodi':96 'boolean':119 'bridg':89 'bsa':159 'call':73,81 'challeng':134,200 'contain':124 'crypto':137 'crypto transaction tracker' 'crypto-data-intelligence' 'custodi':166 'data':33,122,138,147,189,213 'descript':130 'detail':127 'document':152,167,204 'eip155':38 'empti':188 'endpoint':24,55,129,192 'erudit':27 'eruditepay':87 'exact':142 'exampl':185,206 'extens':180 'facilit':84 'field':104,143 'fincen':156 'fulli':151 'gate':57 'hash':8,19,44,105,108 'id':160 'intellig':28,49,139 'json':99,114 'live':194 'llc':29 'look':1,12 'mempool':5,16,32,126,212 'mempool pending transactions' 'mempool-lookup' 'micropay':11,22 'minim':184 'msb':157 'non':165 'non-custodi':164 'object':100,115,123,148,190 'oper':25,163 'path':172 'payment':65 'pend':3,14,31,52 'pending tx lookup' 'pending-transaction-query' 'per':72,80 'post':46 'precis':209 'proper':198 'protocol':61 'provid':154,181 'receiv':48 'regist':158 'remain':215 'request':95 'respons':111,207 'return':30,112,144,173,196,214 'richer':203 'schema':179 'scope':210 'settlement':82 'simpli':136 'singl':103 'spars':169 'status':53 'string':109 'submit':41 'success':118 'support':91 'take':97 'transact':6,17,43,107 'transaction status' 'transaction-hash-lookup' 'tron':77 'unclear':216 'unconfirmed transactions' 'usdc':67,71 'usdc-payment' 'usdt':75,79 'usdt-tron-payment' 'v2':62 'via':9,20,45 'without':202 'x402':10,21,60,88,133 'x402-payment'","prices":[{"id":"7d5a0e78-fd29-47b6-97d9-8288baec0652","listingId":"4d985797-337d-4b1c-9cf0-411a2e724e26","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":"1000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:35.822Z"}],"sources":[{"listingId":"4d985797-337d-4b1c-9cf0-411a2e724e26","source":"x402_bazaar","sourceId":"https://bridge.eruditepay.com/v1/base/mempool/pending","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:35.822Z","lastSeenAt":"2026-04-22T18:05:21.911Z"}],"details":{"listingId":"4d985797-337d-4b1c-9cf0-411a2e724e26","quickStartSnippet":"curl -X POST https://bridge.eruditepay.com/v1/base/mempool/pending \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"hash\": \"0xabc123...\"}'","exampleRequest":{"hash":"0x0000000000000000000000000000000000000000000000000000000000000000"},"exampleResponse":{"data":{},"success":true},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint accepts USDC on Base (amount 10000 = $0.01) and USDT on Tron (amount 10000 = $0.01)","source_url":"https://bridge.eruditepay.com/v1/base/mempool/pending"},{"claim":"Provider is Erudite Intelligence LLC, FinCEN MSB registered with BSA ID 31000324258137","source_url":"https://bridge.eruditepay.com"},{"claim":"EruditePay Bridge supports 20 blockchains and charges 0.5% per settlement","source_url":"https://bridge.eruditepay.com"},{"claim":"x402 facilitator is Coinbase CDP at https://api.cdp.coinbase.com/platform/v2/x402","source_url":"https://bridge.eruditepay.com/v1/base/mempool/pending"}],"useCases":["Check whether a specific Base transaction is still pending in the mempool","Monitor transaction confirmation status for payment verification workflows","Feed mempool data into trading or MEV strategies","Integrate pending-transaction awareness into wallet or dApp UIs","Automate alerts when a submitted transaction appears in the mempool"],"bestFor":["Developers building on Base who need real-time mempool visibility","Agents or bots that need to verify transaction propagation before acting","Applications that track payment status end-to-end"],"notFor":["Querying confirmed/finalized transactions (this is mempool/pending only)","Non-Base chains — this specific endpoint is scoped to Base (eip155:8453)","Users who need free or unauthenticated blockchain data (this requires x402 payment)"],"kindDetails":{},"updatedAt":"2026-04-22T01:39:50.902Z"}}