{"id":"a4d80f39-425a-4899-b9c2-0a3f97157661","shortId":"vhfEKB","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/156/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0.02 USD per request) to a specified wallet address.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI & machine learning (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 no API keys, no rate limits, and instant access via x402 on the Base network.\n\nHowever, the specific endpoint being listed here — `/api/v1/accounts/156/balance` — does not appear in the platform's publicly listed API catalog. It may be an internal or account-specific resource. Documentation beyond the landing page is effectively empty (all sub-pages just show \"Connect wallet\"), so the actual response schema, required POST body, and precise behavior of this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 USDC endpoint","pay-per-call API","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["The endpoint /api/v1/accounts/156/balance is not listed in the provider's public API catalog — it may be an internal or account-specific resource.","All documentation pages (/docs, /api, /pricing, /README) are effectively empty, showing only 'Connect wallet'.","No request body schema or response schema is available; the actual behavior of this endpoint is unknown.","The platform lists many API categories (AI, analytics, finance, utilities) but none can be verified due to absent documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/156/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/accounts/156/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint path does not appear in the provider's public API catalog. All documentation pages return only 'Connect wallet' with no useful 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'0.02':83,134 '000':78 '20':77 '402 payment required' 'Base network API' 'accept':69 'access':146 'account':4,18,35,179 'account balance API' 'account-balance' 'account-specif':178 'actual':200 'address':91 'advertis':96 'ai':104 'analysi':108 'analyt':103 'api':100,139,170 'appear':163 'balanc':5,19,36 'base':8,22,58,79,151 'behavior':208 'behind':49 'beyond':183 'bodi':205 'broader':93 'call':12,26 'catalog':171 'challeng':62 'classif':110 'confirm':63 'connect':196 'convers':127 'crypto payment API' 'data':102 'document':182 'effect':188 'embed':111 'empti':189 'endpoint':6,20,30,65,130,156,211 'estim':121 'exact':71 'exact-schem':70 'exchang':116 'feed':115 'financ':112 'gas':120 'gate':3,17,48 'generat':128 'geocod':125 'howev':153 'infrastructur':123 'instant':145 'intern':176 'key':140 'land':185 'learn':106 'limit':143 'list':132,158,169 'live':67 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,94 'machin':105 'may':173 'network':59,152 'no-api-key' 'page':186,193 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':41,55,73 'per':11,25,52,85,135 'per-request':51 'platform':95,166 'post':204 'precis':207 'price':114 'protocol':42 'provid':33 'public':168 'quot':119 'rate':117,142 'request':53,86,136 'requir':203 'resourc':45,181 'respons':201 'schema':202 'scheme':72 'sentiment':107 'show':195 'span':101 'specif':44,155,180 'specifi':89 'sub':192 'sub-pag':191 'suit':98 'summar':109 'token':118 'unit':80 'unknown':213 'usd':84 'usdc':14,28,54,82 'usdc-base' 'util':124 'valid':126 'via':38,147 'wallet':90,197 'web3':113 'x402':2,16,40,61,148 'x402 USDC endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"57a6abbf-7ef7-47e8-9435-3862f97494a9","listingId":"a4d80f39-425a-4899-b9c2-0a3f97157661","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/accounts/156/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":"2026-04-18T18:41:15.121Z"}],"sources":[{"listingId":"a4d80f39-425a-4899-b9c2-0a3f97157661","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/156/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:15.121Z","lastSeenAt":"2026-04-27T19:33:55.037Z"}],"details":{"listingId":"a4d80f39-425a-4899-b9c2-0a3f97157661","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/156/balance\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/156/balance"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information via a pay-per-request model","Integrating x402-gated API calls into agent workflows on Base","Accessing financial data without traditional API key management"],"bestFor":["Agents or services that can settle USDC payments on Base","Developers wanting zero-signup, pay-per-call API access","Prototyping x402 payment flows"],"notFor":["Users needing detailed API documentation or response schemas before integration","High-volume use cases where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.743Z"},"updatedAt":"2026-04-27T19:33:55.037Z"}}