{"id":"dbf675e4-84a5-42ff-ae9f-a385776d93d5","shortId":"2zYvMF","kind":"x402","title":"Query ERC-20 token approvals for any wallet on Base via a pay-per-call x402 endpoint.","tagline":"Query ERC-20 token approvals for any wallet on Base via a pay-per-call x402 endpoint.","description":"This endpoint, operated by Erudite Intelligence LLC, returns token approval (allowance) data for a given wallet address and token on the Base network. You POST a JSON body containing an `address` (wallet or contract) and a `token` (token contract address or symbol), and receive a JSON response indicating success along with the approval data.\n\nPayment is handled via the x402 protocol (version 2). Each call costs 10,000 base units of USDC on Base (0.01 USD) or 10,000 base units of USDT on Tron (0.01 USD). The payment is facilitated through the EruditePay Bridge, which supports settlement on 20 blockchains. The facilitator for the Base/USDC option is Coinbase CDP.\n\nDocumentation beyond the x402 challenge and the landing page is sparse — the `/docs` path returns a 404, and the Bazaar schema embedded in the challenge provides only a minimal example output (`{\"success\": true, \"data\": {}}`). The exact shape of the `data` object in the response is not documented, so consumers should expect to discover the response structure empirically. The endpoint is live and returning a proper 402 challenge.","tags":[],"capabilities":["token-approvals","erc20-allowance","wallet-analysis","base-chain","x402-payment","crypto-data-intelligence"],"categories":["crypto","blockchain-data"],"synonyms":["ERC-20 allowance checker","token approval lookup","wallet token approvals","spender allowance query","Base USDC token approvals","crypto wallet approvals"],"warnings":["No dedicated documentation available — /docs returns 404","Response data structure is undocumented; the example output is just {\"success\": true, \"data\": {}}","Token field description says 'Token address or symbol' but it is unclear which symbols are accepted"],"endpointUrl":"https://bridge.eruditepay.com/api/base/wallet/token-approvals","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":"0.500","qualityRationale":"The endpoint is live and returns a well-formed x402 v2 challenge with clear pricing and a Bazaar schema. However, documentation is effectively absent (the /docs path 404s), the response data shape is unknown beyond a stub example, and there is no OpenAPI spec. Pricing and input schema are clear from the 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'/docs':159 '0.01':111,122 '000':104,115 '10':103,114 '2':99 '20':136 '402':212 '404':163 'Base USDC token approvals' 'ERC-20 allowance checker' 'address':53,67,76 'allow':47 'along':86 'approv':5,23,46,89 'base':10,28,58,105,110,116 'base-chain' 'base/usdc':142 'bazaar':166 'beyond':148 'blockchain':137 'bodi':64 'bridg':131 'call':16,34,101 'cdp':146 'challeng':151,171,213 'coinbas':145 'consum':195 'contain':65 'contract':70,75 'cost':102 'crypto wallet approvals' 'crypto-data-intelligence' 'data':48,90,180,186 'discov':199 'document':147,193 'embed':168 'empir':203 'endpoint':18,36,38,205 'erc':2,20 'erc20-allowance' 'erudit':41 'eruditepay':130 'exact':182 'exampl':176 'expect':197 'facilit':127,139 'given':51 'handl':93 'indic':84 'intellig':42 'json':63,82 'land':154 'live':207 'llc':43 'minim':175 'network':59 'object':187 'oper':39 'option':143 'output':177 'page':155 'path':160 'pay':14,32 'pay-per-cal':13,31 'payment':91,125 'per':15,33 'post':61 'proper':211 'protocol':97 'provid':172 'queri':1,19 'receiv':80 'respons':83,190,201 'return':44,161,209 'schema':167 'settlement':134 'shape':183 'spars':157 'spender allowance query' 'structur':202 'success':85,178 'support':133 'symbol':78 'token':4,22,45,55,73,74 'token approval lookup' 'token-approvals' 'tron':121 'true':179 'unit':106,117 'usd':112,123 'usdc':108 'usdt':119 'version':98 'via':11,29,94 'wallet':8,26,52,68 'wallet token approvals' 'wallet-analysis' 'x402':17,35,96,150 'x402-payment'","prices":[{"id":"aa8f9a13-92d1-4337-82c1-67be155ac2ea","listingId":"dbf675e4-84a5-42ff-ae9f-a385776d93d5","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":"2026-04-21T18:32:37.004Z"}],"sources":[{"listingId":"dbf675e4-84a5-42ff-ae9f-a385776d93d5","source":"x402_bazaar","sourceId":"https://bridge.eruditepay.com/api/base/wallet/token-approvals","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:37.004Z","lastSeenAt":"2026-04-22T07:02:22.876Z"}],"details":{"listingId":"dbf675e4-84a5-42ff-ae9f-a385776d93d5","quickStartSnippet":"curl -X POST https://bridge.eruditepay.com/api/base/wallet/token-approvals \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"address\":\"0xYourWalletAddress\",\"token\":\"0xTokenContractAddress\"}'","exampleRequest":{"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","address":"0x0000000000000000000000000000000000000000"},"exampleResponse":{"data":{},"success":true},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Each call costs 10,000 base units of USDC on Base (eip155:8453) or 10,000 base units of USDT on Tron","source_url":"https://bridge.eruditepay.com/api/base/wallet/token-approvals"},{"claim":"USDC on Base uses 6 decimals, so 10,000 base units = $0.01","source_url":"https://bridge.eruditepay.com"},{"claim":"Operated by Erudite Intelligence LLC, FinCEN MSB registered","source_url":"https://bridge.eruditepay.com"},{"claim":"EruditePay Bridge supports 20 blockchains and uses x402 v2.0","source_url":"https://bridge.eruditepay.com"},{"claim":"Coinbase CDP is listed as the facilitator for the Base/USDC payment option","source_url":"https://bridge.eruditepay.com/api/base/wallet/token-approvals"}],"useCases":["Check which contracts a wallet has approved to spend its tokens on Base","Audit token allowances before interacting with a DeFi protocol","Monitor wallets for risky or unlimited token approvals","Build dashboards showing outstanding ERC-20 approvals for a portfolio"],"bestFor":["Agents or bots that need on-demand token approval data for Base wallets","Security auditing tools checking for excessive allowances","DeFi portfolio trackers needing approval metadata"],"notFor":["Querying token approvals on chains other than Base (endpoint is Base-specific)","Fetching general token balances or transaction history","Free or high-volume bulk scanning — each call costs $0.01"],"kindDetails":{},"updatedAt":"2026-04-22T02:03:23.856Z"}}