{"id":"5b174e9f-79a1-4e3e-b1fb-78541adccd46","shortId":"RnfdpS","kind":"x402","title":"Check USDC wallet balances on Base via pay-per-call x402 endpoint.","tagline":"Check USDC wallet balances on Base via pay-per-call x402 endpoint.","description":"This endpoint at lowpaymentfee.com provides a USDC wallet balance lookup accessible through the x402 payment protocol. The specific endpoint `/api/v1/wallet/USDC/balance` accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe provider operates a broader platform offering multiple API categories including data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same x402 payment model on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what parameters this balance endpoint accepts or what shape the response takes. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes integration speculative.","tags":[],"capabilities":["usdc-balance-lookup","x402-payment","base-network","pay-per-call","no-api-key","crypto-wallet-query"],"categories":["crypto","finance"],"synonyms":["USDC balance check","wallet balance API","Base network USDC","crypto balance query","ERC-20 balance lookup","stablecoin balance"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request parameters or response format","Request body structure is entirely inferred — actual required fields are unknown","Response format is unknown — example_response_json is null"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/USDC/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/USDC/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all documentation pages are empty stubs showing only 'Connect wallet'. The request example is inferred, not 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'0.02':63,75,136 '000':69 '20':68 '402':202 '6':73 'Base network USDC' 'ERC-20 balance lookup' 'USDC balance check' 'accept':47,187 'access':37 'ai/ml':107 'analysi':110 'analyt':106 'api':77,102,153 'attach':86 'balanc':4,17,35,185 'base':6,19,60,70,146 'base-network' 'broader':98 'call':11,24 'caller':84 'categori':103 'challeng':203 'check':1,14 'classif':112 'confirm':197 'connect':162 'content':168 'convers':129 'crypto balance query' 'crypto-wallet-query' 'data':105 'decim':74 'detail':179 'doc':152 'document':147,180,208 'embed':113 'endpoint':13,26,28,45,132,186,195 'estim':123 'exampl':176 'exchang':118 'extrem':149 'feed':117 'financ':114 'gas':122 'generat':130 'geocod':127 'header':90 'includ':104 'infer':108 'infrastructur':125 'integr':210 'json':52 'key':78 'lack':206 'limit':81 'list':134 'live':198 'lookup':36 'lowpaymentfee.com':30 'make':209 'maxamountrequir':66 'model':144 'multipl':101 'network':61 'no-api-key' 'offer':100 'openapi':172 'oper':96 'page':157 'paramet':183 'pay':9,22 'pay-per-cal':8,21 'pay-per-call' 'payment':41,53,89,143 'per':10,23,64,137 'platform':99 'post':48 'price':116,154 'prompt':164 'proper':201 'protocol':42 'provid':31,95 'quot':121 'rate':80,119 'readm':156 'render':159 'request':49,65,93,138 'request/response':175 'requir':83 'respons':192 'return':51,199 'schema':173 'sentiment':109 'settl':55 'shape':190 'simpli':85 'spars':150 'specif':44 'specul':211 'stablecoin balance' 'summar':111 'take':193 'token':120 'unit':71 'usdc':2,15,33,57 'usdc-balance-lookup' 'util':126 'valid':128 'via':7,20 'wallet':3,16,34,163 'wallet balance API' 'web3':115 'x402':12,25,40,88,142 'x402-payment'","prices":[{"id":"13431e3a-4eae-49e5-a147-5f23787c943b","listingId":"5b174e9f-79a1-4e3e-b1fb-78541adccd46","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/USDC/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":"2026-04-18T19:28:30.081Z"}],"sources":[{"listingId":"5b174e9f-79a1-4e3e-b1fb-78541adccd46","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/USDC/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:30.081Z","lastSeenAt":"2026-04-23T09:31:50.482Z"}],"details":{"listingId":"5b174e9f-79a1-4e3e-b1fb-78541adccd46","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/USDC/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"address\": \"0xYourWalletAddress\"}'","exampleRequest":{"address":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/USDC/balance"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/USDC/balance"}],"useCases":["Querying USDC balances for a wallet address on Base network","Automated portfolio tracking that needs on-demand balance checks","Agent-driven workflows that need to verify USDC holdings before executing transactions"],"bestFor":["Agents needing quick USDC balance lookups without API key management","Pay-per-use crypto balance queries on Base","Lightweight wallet monitoring without running a full node"],"notFor":["Bulk historical balance queries (no documented batch support)","Multi-chain or non-USDC token balance lookups (endpoint is USDC-specific)","Users who need detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.086Z"},"updatedAt":"2026-04-23T09:31:50.482Z"}}