{"id":"fb6007fc-cfe2-4cb9-ba32-53ef23ccf062","shortId":"EM4XgJ","kind":"x402","title":"Query AAVE wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Query AAVE wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns AAVE token wallet balance data, paid per-call using the x402 protocol. The payment is settled in USDC on the Base network at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the data.\n\nThe endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. The specific endpoint `/api/v1/wallet/AAVE/balance` falls under the Finance & Web3 category and is designed to return balance information for the AAVE token. The endpoint accepts POST requests and returns JSON.\n\nDocumentation on the site is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of required parameters or response fields. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to know what request body (if any) is expected or what the response structure looks like.","tags":[],"capabilities":["x402-payment","usdc-base","wallet-balance","aave-token","per-request-pricing","no-api-key","json-response"],"categories":["crypto","finance"],"synonyms":["AAVE balance API","AAVE wallet lookup","token balance check","crypto wallet balance","DeFi token balance","AAVE holdings query"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content","No OpenAPI or schema definition for request or response bodies","Example request JSON is speculative — the actual required parameters are unknown","The broader site lists many API categories but it is unclear how mature or complete each endpoint is"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/AAVE/balance","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/AAVE/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational at $0.02/request in USDC on Base. However, documentation is essentially nonexistent — no OpenAPI schema, no request/response examples, and no parameter descriptions. The request body and response format are entirely 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'0.02':11,24,59,124 '000':63 '20':62 '6':69 'AAVE balance API' 'AAVE holdings query' 'AAVE wallet lookup' 'DeFi token balance' 'aav':2,15,32,146 'aave-token' 'accept':150 'access':94 'ai/ml':113 'analyt':112 'api':72,106,167 'attach':81 'balanc':4,17,35,142 'base':9,22,53,64 'bodi':224 'broader':103 'call':40 'caller':79 'categori':136 'challeng':200 'confirm':207 'connect':173 'cost':57 'crypto wallet balance' 'data':36,96,111,116 'decim':70 'descript':191 'design':139 'detail':180 'difficult':219 'doc':164 'document':156,216 'endpoint':28,98,129,149,209 'exampl':188 'expect':228 'extrem':161 'fall':131 'field':197 'financ':134 'finance/web3':115 'form':206 'header':86 'infer':114 'inform':143 'json':155 'json-response' 'key':73 'know':221 'lack':214 'like':235 'limit':76 'live':202 'look':234 'lowpaymentfee.com':30,109 'make':217 'micropay':7,20 'network':54 'no-api-key' 'offer':107 'openapi':184 'oper':211 'page':168 'paid':37 'paramet':194 'part':100 'payment':46,85,91 'per':12,25,39,60,125 'per-cal':38 'per-request-pricing' 'post':151 'price':121,165 'prompt':175 'proof':92 'protocol':44 'queri':1,14 'rate':75 'render':170 'request':13,26,61,126,152,223 'request/response':187 'requir':78,193 'respons':196,232 'return':31,141,154 'schema':185 'servic':119 'settl':48 'simpli':80 'site':159 'span':110 'spars':162 'specif':128 'structur':233 'suit':104 'technic':179 'token':33,147 'token balance check' 'uniform':122 'unit':65 'usdc':50,67 'usdc-base' 'use':41 'util':118 'valid':89 'via':5,18 'wallet':3,16,34,174 'wallet-balance' 'web3':135 'well':205 'well-form':204 'x':84 'x-payment':83 'x402':6,19,43,90,199 'x402-payment'","prices":[{"id":"19d78dd9-4bfd-47ae-90ef-84190710f4c4","listingId":"fb6007fc-cfe2-4cb9-ba32-53ef23ccf062","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/AAVE/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:03.873Z"}],"sources":[{"listingId":"fb6007fc-cfe2-4cb9-ba32-53ef23ccf062","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/AAVE/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:03.873Z","lastSeenAt":"2026-04-23T16:07:51.669Z"}],"details":{"listingId":"fb6007fc-cfe2-4cb9-ba32-53ef23ccf062","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/AAVE/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/AAVE/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/wallet/AAVE/balance"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint is listed under Finance & Web3 category alongside price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying AAVE token balances for a given wallet address","Building portfolio trackers that need on-demand AAVE balance data","Automated DeFi dashboards that check token holdings per-call"],"bestFor":["Agents or apps needing pay-per-call AAVE balance lookups without API key management","Low-volume or sporadic queries where subscription pricing is wasteful","x402-native agents that can attach payment headers automatically"],"notFor":["High-frequency balance polling where $0.02/request adds up quickly","Users who need detailed AAVE position data (staking, lending, rewards) — unclear if this endpoint provides that","Developers who need comprehensive documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.268Z"},"updatedAt":"2026-04-23T16:07:51.669Z"}}