{"id":"abee3918-6b14-4aaa-b68e-e9e6f8338619","shortId":"vsWAPc","kind":"x402","title":"Monitor smart contract calls on Base and other chains via a pay-per-request x402 endpoint.","tagline":"Monitor smart contract calls on Base and other chains via a pay-per-request x402 endpoint.","description":"This x402-enabled endpoint from Erudite Intelligence LLC lets you monitor contract calls for a given smart contract address on a specified blockchain. You POST a JSON body containing a contract address and chain identifier, and receive structured data about contract call activity. The endpoint is described as \"Crypto data intelligence\" and accepts payment in USDC on Base (via Coinbase CDP facilitator) or USDT on Tron, at $0.01 per request.\n\nThe endpoint follows the x402 v2 protocol: unauthenticated requests receive an HTTP 402 challenge with payment requirements, and once payment is attached via the X-PAYMENT header, the endpoint returns results. The request schema requires an `address` field (the contract address to monitor) and a `chain` field (the blockchain network). The response returns a JSON object with a `success` boolean and a `data` object, though the exact structure of the data payload is not documented beyond the example stub.\n\nThe provider, Erudite Intelligence LLC, operates the EruditePay x402 Bridge facilitator supporting 20 blockchains. They are registered as a FinCEN MSB (BSA ID 31000324258137) and operate non-custodially. Documentation at docs.eruditepay.com is referenced but the /docs path on the bridge itself returns a 404, so detailed field-level documentation for this specific monitoring endpoint is unavailable.","tags":[],"capabilities":["contract-call-monitoring","blockchain-analytics","multi-chain-support","x402-payment","pay-per-request","base-chain","tron-chain","usdc-payment","usdt-payment"],"categories":["crypto","blockchain","analytics"],"synonyms":["smart contract monitor","contract call tracker","on-chain activity monitor","blockchain contract analytics","contract interaction monitor","crypto data intelligence","contract call watcher"],"warnings":["Response data structure is undocumented — the example only shows an empty object","docs.eruditepay.com is referenced but the /docs path on the bridge returns endpoint_not_found","The exact fields returned in the 'data' object for contract call monitoring are not specified anywhere in available materials","No OpenAPI spec available for this endpoint"],"endpointUrl":"https://bridge.eruditepay.com/v1/base/monitor/contract-calls","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 (402 challenge captured) with a clear input schema and pricing, but the response data structure is only shown as an empty stub. No detailed documentation is available (docs.eruditepay.com referenced but /docs returns 404), and the actual content of the `data` field is 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'0.01':103 '20':198 '31000324258137':209 '402':118 '404':230 'accept':88 'activ':78 'address':54,67,143,147 'attach':127 'base':6,23,93 'base-chain' 'beyond':182 'blockchain':58,155,199 'blockchain contract analytics' 'blockchain-analytics' 'bodi':63 'boolean':166 'bridg':195,226 'bsa':207 'call':4,21,48,77 'cdp':96 'chain':9,26,69,152 'challeng':119 'coinbas':95 'contain':64 'contract':3,20,47,53,66,76,146 'contract call tracker' 'contract call watcher' 'contract interaction monitor' 'contract-call-monitoring' 'crypto':84 'crypto data intelligence' 'custodi':214 'data':74,85,169,177 'describ':82 'detail':232 'docs.eruditepay.com':217 'document':181,215,236 'enabl':38 'endpoint':17,34,39,80,107,135,241 'erudit':41,188 'eruditepay':193 'exact':173 'exampl':184 'facilit':97,196 'field':144,153,234 'field-level':233 'fincen':205 'follow':108 'given':51 'header':133 'http':117 'id':208 'identifi':70 'intellig':42,86,189 'json':62,161 'let':44 'level':235 'llc':43,190 'monitor':1,18,46,149,240 'msb':206 'multi-chain-support' 'network':156 'non':213 'non-custodi':212 'object':162,170 'on-chain activity monitor' 'oper':191,211 'path':223 'pay':13,30 'pay-per-request':12,29 'payload':178 'payment':89,121,125,132 'per':14,31,104 'post':60 'protocol':112 'provid':187 'receiv':72,115 'referenc':219 'regist':202 'request':15,32,105,114,139 'requir':122,141 'respons':158 'result':137 'return':136,159,228 'schema':140 'smart':2,19,52 'smart contract monitor' 'specif':239 'specifi':57 'structur':73,174 'stub':185 'success':165 'support':197 'though':171 'tron':101 'tron-chain' 'unauthent':113 'unavail':243 'usdc':91 'usdc-payment' 'usdt':99 'usdt-payment' 'v2':111 'via':10,27,94,128 'x':131 'x-payment':130 'x402':16,33,37,110,194 'x402-enabled':36 'x402-payment'","prices":[{"id":"711c1c58-aeed-4196-825c-85755783e047","listingId":"abee3918-6b14-4aaa-b68e-e9e6f8338619","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":"2026-04-21T18:32:37.050Z"}],"sources":[{"listingId":"abee3918-6b14-4aaa-b68e-e9e6f8338619","source":"x402_bazaar","sourceId":"https://bridge.eruditepay.com/v1/base/monitor/contract-calls","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:37.050Z","lastSeenAt":"2026-04-22T05:32:29.237Z"}],"details":{"listingId":"abee3918-6b14-4aaa-b68e-e9e6f8338619","quickStartSnippet":"curl -X POST https://bridge.eruditepay.com/v1/base/monitor/contract-calls \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"address\": \"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\", \"chain\": \"base\"}'","exampleRequest":{"chain":"base","address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"},"exampleResponse":{"data":{},"success":true},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 v2 challenge with USDC on Base (amount 10000 = $0.01) and USDT on Tron","source_url":"https://bridge.eruditepay.com/v1/base/monitor/contract-calls"},{"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 operates non-custodially","source_url":"https://bridge.eruditepay.com"},{"claim":"Endpoint description is 'Crypto data intelligence' and accepts POST with address and chain fields","source_url":"https://bridge.eruditepay.com/v1/base/monitor/contract-calls"},{"claim":"Coinbase CDP facilitator used for Base USDC payments","source_url":"https://bridge.eruditepay.com/v1/base/monitor/contract-calls"}],"useCases":["Monitoring smart contract interactions for a DeFi protocol on Base","Tracking contract call activity for security or compliance auditing","Building dashboards that display real-time contract usage across chains","Automated alerting when specific contracts receive calls","Agent-driven on-chain intelligence gathering for trading strategies"],"bestFor":["Developers needing per-call contract monitoring without subscription commitments","AI agents that need on-demand blockchain intelligence with micropayments","Teams monitoring smart contract activity across multiple chains"],"notFor":["Historical bulk data export or full blockchain indexing","Free-tier or ad-supported analytics needs","Monitoring non-EVM chains not listed in the supported set"],"kindDetails":{},"updatedAt":"2026-04-22T02:07:14.861Z"}}