{"id":"65499315-dc7d-45a7-8680-0d787060a976","shortId":"yqTyDr","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/163/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), settled to a specified wallet address. The endpoint accepts POST requests and returns JSON.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto data (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 no commitments required — payment is handled entirely via the x402 protocol on the Base L2 network using USDC.\n\nHowever, this specific endpoint (`/api/v1/accounts/163/balance`) is labeled only as \"Premium API Access\" with no further documentation on what the balance response contains or what account 163 refers to. The docs, pricing, and API pages on the site returned only a \"Connect wallet\" prompt with no additional technical detail. Without schema documentation or example responses, the actual data returned by this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-request API","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages all return only a 'Connect wallet' prompt with no technical content.","The meaning of 'account 163' and what 'balance' data is returned are completely undocumented.","No OpenAPI spec, no response schema, and no example responses are available.","The broader platform lists many API categories (AI, finance, analytics, etc.) but none have visible documentation beyond titles and prices."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/163/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/163/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 per call on Base), but there is no documentation on what the endpoint returns, no OpenAPI schema, no example responses, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The specific resource path (/api/v1/accounts/163/balance) is 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'0.02':74,139 '000':69 '163':193 '20':68 'Base network API' 'USDC micropayment API' 'accept':86 'access':179 'account':4,18,35,192 'account balance API' 'account-balance' 'actual':223 'addit':213 'address':83 'advertis':96 'ai/ml':108 'analysi':111 'analyt':107 'api':104,144,178,200 'balanc':5,19,36,187 'base':8,22,58,70,163 'base-network' 'behind':49 'broader':93 'call':12,26,103 'challeng':62 'classif':113 'commit':151 'connect':208 'contain':189 'convers':132 'cost':66 'crypto':117 'data':106,118,224 'detail':215 'doc':197 'document':183,218 'embed':114 'endpoint':6,20,30,85,135,171,228 'entir':156 'estim':126 'exampl':220 'exchang':121 'feed':120 'financ':115 'gas':125 'gate':3,17,48 'generat':133 'geocod':130 'handl':155 'howev':168 'indic':63 'infer':109 'infrastructur':128 'json':91 'key':145 'l2':164 'label':174 'limit':148 'list':137 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,94 'maximum':65 'network':59,165 'no-api-key' 'page':201 'pay':10,24,101 'pay-per-cal':9,23,100 'pay-per-call' 'pay-per-request API' 'payment':41,55,153 'per':11,25,52,76,102,140 'per-request':51 'platform':95 'post':87 'premium':177 'price':119,198 'prompt':210 'protocol':42,160 'provid':33 'quot':124 'rate':122,147 'refer':194 'request':53,77,88,141 'requir':152 'resourc':45 'respons':188,221 'return':90,205,225 'schema':217 'sentiment':110 'settl':78 'site':204 'span':105 'specif':44,170 'specifi':81 'suit':98 'summar':112 'technic':214 'token':123 'unit':71 'unknown':230 'usd':75 'usdc':14,28,54,73,167 'usdc-settlement' 'use':166 'util':129 'valid':131 'via':38,157 'wallet':82,209 'without':216 'x402':2,16,40,61,159 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e0ab0734-f47a-4cb1-b719-a9626a6a44e2","listingId":"65499315-dc7d-45a7-8680-0d787060a976","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/163/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":"2026-04-18T18:41:19.320Z"}],"sources":[{"listingId":"65499315-dc7d-45a7-8680-0d787060a976","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/163/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:19.320Z","lastSeenAt":"2026-04-27T19:33:55.276Z"}],"details":{"listingId":"65499315-dc7d-45a7-8680-0d787060a976","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/163/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 (USD Coin, 6 decimals = $0.02) on the Base network.","source_url":"https://lowpaymentfee.com/api/v1/accounts/163/balance"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages return only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data with per-request USDC micropayments","Agent-driven balance lookups without API key management","Programmatic access to account information via x402 payment gating"],"bestFor":["Agents or services that need keyless, pay-per-call API access","Developers experimenting with x402 payment protocol on Base","Scenarios where per-request billing is preferred over subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may add up compared to flat-rate plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.505Z"},"updatedAt":"2026-04-27T19:33:55.276Z"}}