{"id":"3a186052-2522-4862-85cf-48c28aa6e858","shortId":"a2nkpy","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/56/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), consistent with the site-wide $0.02/request pricing advertised across all endpoints.\n\nThe provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML (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 priced at $0.02 per request, require no API keys, and claim no rate limits.\n\nHowever, the specific functionality of this particular endpoint (`/accounts/56/balance`) is unclear — it appears to be an account balance query, but no documentation describes the request format, expected input parameters, or response schema. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without schema details or example responses, the actual utility of this endpoint is difficult to assess.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no content.","No request or response schema provided; input format and output structure are unknown.","The endpoint path references a specific account ID (56), and it is unclear whether this is parameterizable or a fixed demo resource.","The broader site lists many endpoint categories (AI, finance, utils) but none have visible documentation — actual functionality behind these endpoints is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/56/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/56/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the docs pages are empty. The purpose of this specific endpoint (account 56 balance) is ambiguous and 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'/api/v1/accounts/56/balance':46 '/request':85 '0.02':74,84,134 '000':69 '20':68 'Base network API' 'USDC micropayment API' 'account':4,18,35,162 'account balance API' 'account-balance' 'across':88 'actual':203 'advertis':87 'ai/ml':106 'analysi':108 'analyt':105 'api':102,139,181 'appear':158 'assess':211 'balanc':5,19,36,163 'base':8,22,58,70 'behind':49 'broader':96 'call':12,26 'challeng':62 'claim':142 'classif':110 'connect':189 'consist':78 'content':195 'convers':127 'cost':66 'data':104 'describ':168 'detail':198 'difficult':209 'doc':179 'document':167 'embed':111 'endpoint':6,20,30,90,130,153,207 'estim':121 'exampl':200 'exchang':116 'expect':172 'feed':115 'financ':112 'format':171 'function':149 'gas':120 'gate':3,17,48,101 'generat':128 'geocod':125 'host':94 'howev':146 'indic':63 'infrastructur':123 'input':173 'key':140 'limit':145 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,93 'maximum':65 'network':59 'no-api-key' 'page':184 'paramet':174 'particular':152 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':41,55 'per':11,25,52,76,135 'per-request':51 'price':86,114,132,180 'prompt':191 'protocol':42 'provid':33,92 'queri':164 'quot':119 'rate':117,144 'readm':183 'request':53,77,136,170 'requir':137 'resourc':45 'respons':176,201 'return':186 'schema':177,197 'sentiment':107 'site':82 'site-wid':81 'span':103 'specif':44,148 'substant':194 'suit':97 'summar':109 'token':118 'unclear':156 'unit':71 'usd':75 'usdc':14,28,54,73 'usdc-base-network' 'util':124,204 'valid':126 'via':38 'wallet':190 'web3':113 'wide':83 'without':196 'x402':2,16,40,61,100 'x402 API' 'x402-gated':1,15,99 'x402-payment'","prices":[{"id":"b2dbc284-d0a9-4316-a154-a075dd1fe5b5","listingId":"3a186052-2522-4862-85cf-48c28aa6e858","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/56/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":"2026-04-18T18:39:50.468Z"}],"sources":[{"listingId":"3a186052-2522-4862-85cf-48c28aa6e858","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/56/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:50.468Z","lastSeenAt":"2026-04-28T06:33:39.871Z"}],"details":{"listingId":"3a186052-2522-4862-85cf-48c28aa6e858","quickStartSnippet":"# 1. Send a POST to the endpoint — you'll get a 402 with payment challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/56/balance\n# 2. Parse the 402 response, construct an x402 payment header (USDC on Base),\n#    and resend with X-PAYMENT header attached.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/56/balance"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information via a single paid API call","Integrating x402 payment-gated balance lookups into agent workflows","Demonstrating x402 protocol usage for micropayment-based API access"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call balance data without API key management","Low-volume queries where $0.02/request is acceptable"],"notFor":["High-volume balance monitoring requiring bulk or subscription pricing","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.819Z"},"updatedAt":"2026-04-28T06:33:39.871Z"}}