{"id":"0bd25934-b979-4391-aa2c-33f8a0c643a9","shortId":"VrBj7v","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/118/balance` is gated behind an x402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the \"exact\" scheme to a specified wallet address, with a timeout of 300 seconds.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text 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 no minimum commitments. However, the specific endpoint being listed here is an account balance resource under `/api/v1/accounts/118/balance`, which does not appear in the site's public API catalog and has only the generic description \"Premium API Access.\"\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 this or any other endpoint on the platform. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what the balance response actually contains is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content","This specific endpoint (/api/v1/accounts/118/balance) does not appear in the site's public API catalog","No request or response schema is available; the actual response format is unknown","The endpoint path references a hardcoded account ID (118), suggesting it may be account-specific rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/118/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/118/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint (/api/v1/accounts/118/balance) is not listed in the site's public catalog. The docs pages are empty. This is effectively a stub 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'0.02':78,150 '000':69 '20':68 '300':97 '402':249 '6':74 'Base network API' 'USDC micropayment API' 'access':197 'account':4,18,35,173 'account balance API' 'account-balance' 'actual':257 'address':92 'advertis':103 'ai':119 'amount':63 'analysi':123 'analyt':113 'api':110,155,187,196,204 'appear':181 'balanc':5,19,36,174,255 'base':8,22,59,70 'behind':49 'broader':100 'call':12,26,66 'catalog':188 'challeng':52,251 'classif':126 'commit':163 'confirm':244 'connect':213 'contain':258 'content':219 'convers':143 'data':112,116 'decim':75 'descript':194 'detail':230 'doc':203 'document':198,231 'embed':127 'endpoint':6,20,30,146,167,237,242 'equal':77 'estim':137 'exact':86 'exampl':227 'exchang':132 'export':117 'extrem':200 'feed':131 'financ':128 'gas':136 'gate':3,17,48,109 'generat':144 'generic':193 'geocod':141 'howev':164 'infrastructur':139 'insight':118 'key':156 'learn':121 'limit':159 'list':148,169 'live':245 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,101 'machin':120 'made':83 'maximum':62 'metric':114 'minimum':162 'network':60 'no-api-key' 'openapi':223 'page':208 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':41,54,81 'per':11,25,65,79,151 'platform':102,240 'premium':195 'price':130,205 'prompt':215 'proper':248 'protocol':42 'provid':33 'public':186 'quot':135 'rate':133,158 'readm':207 'render':210 'report':115 'request':80,152 'request/response':226 'requir':53,64 'resourc':45,175 'respons':256 'return':246 'schema':224 'scheme':87 'second':98 'sentiment':122 'site':184 'span':111 'spars':201 'specif':44,166 'specifi':90 'suit':105 'summar':125 'text':124 'timeout':95 'token':134 'unit':71 'unknown':260 'usdc':14,28,56,73 'usdc-base' 'util':140 'valid':142 'via':38,84 'wallet':91,214 'web3':129 'x402':2,16,40,51,108,250 'x402 balance check' 'x402-gated':1,15,107 'x402-payment'","prices":[{"id":"1d0b7ade-cf45-4f03-9589-ecd24e4e5c03","listingId":"0bd25934-b979-4391-aa2c-33f8a0c643a9","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/118/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":"2026-04-18T18:40:48.559Z"}],"sources":[{"listingId":"0bd25934-b979-4391-aa2c-33f8a0c643a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/118/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:48.559Z","lastSeenAt":"2026-04-27T22:03:22.811Z"}],"details":{"listingId":"0bd25934-b979-4391-aa2c-33f8a0c643a9","quickStartSnippet":"# The endpoint returns a 402 challenge. Supply an X-PAYMENT header with a valid x402 payment proof.\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/118/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 requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/118/balance"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information for account 118 via a single paid API call","Demonstrating x402 payment protocol integration on Base network","Agent-driven balance lookups without API key provisioning"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases requiring keyless, pay-per-call API access"],"notFor":["Production workloads requiring documented response schemas and SLAs","Users who need free or subscription-based access to balance data","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.071Z"},"updatedAt":"2026-04-27T22:03:22.811Z"}}