{"id":"c6ec6c76-5c67-4a98-bf31-12c0f6c10293","shortId":"pFmhcW","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/88/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) settled to a specified wallet address.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call 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 commitments required — payment is handled entirely via the x402 protocol on the Base L2 network.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/accounts/88/balance` endpoint actually returns. The endpoint's purpose — whether it returns a crypto wallet balance, a platform account balance, or something else — is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","account-balance","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","Purpose of /api/v1/accounts/88/balance is unclear — no description of what 'account 88' refers to","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/88/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/88/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually returns. Docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/accounts/88/balance':46 '0.02':83,145 '000':78 '20':77 'Base network API' 'USDC micropayment API' 'accept':69 'account':4,18,35,227 'account balance API' 'account-balance' 'actual':212 'address':92 'advertis':97 'ai':114 'analysi':118 'analyt':108 'api':105,150,179 'avail':236 'balanc':5,19,36,224,228 'base':8,22,58,79,169 'behind':49 'broader':94 'call':12,26,104 'challeng':62 'classif':121 'commit':157 'confirm':63 'connect':188 'convers':138 'crypto':222 'data':107,111 'descript':206 'detail':195 'doc':178 'document':173 'els':231 'embed':122 'endpoint':6,20,30,65,141,211,215 'entir':162 'estim':132 'exact':71 'exact-schem':70 'exampl':203 'exchang':127 'export':112 'extrem':175 'feed':126 'financ':123 'gas':131 'gate':3,17,48 'generat':139 'geocod':136 'handl':161 'howev':172 'infrastructur':134 'insight':113 'json-response' 'key':151 'l2':170 'learn':116 'limit':154 'list':143 'live':67 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,95 'machin':115 'materi':237 'metric':109 'network':59,171 'openapi':199 'page':183 'pay':10,24,102 'pay-per-cal':9,23,101 'pay-per-call balance' 'pay-per-request' 'payment':41,55,73,159 'per':11,25,52,85,103,146 'per-request':51 'platform':96,226 'price':125,180 'prompt':190 'protocol':42,166 'provid':33 'purpos':217 'quot':130 'rate':128,153 'readm':182 'render':185 'report':110 'request':53,86,147 'request/response':202 'requir':158 'resourc':45 'return':213,220 'schema':200 'scheme':72 'sentiment':117 'settl':87 'someth':230 'span':106 'spars':176 'specif':44 'specifi':90 'suit':99 'summar':120 'technic':194 'text':119 'token':129 'unclear':233 'unit':80 'usd':84 'usdc':14,28,54,82 'usdc-base' 'util':135 'valid':137 'via':38,163 'wallet':91,189,223 'web3':124 'whether':218 'x402':2,16,40,61,165 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"230f535b-3631-4c1d-b61b-0f91a97ba5da","listingId":"c6ec6c76-5c67-4a98-bf31-12c0f6c10293","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/88/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":"2026-04-18T18:40:16.452Z"}],"sources":[{"listingId":"c6ec6c76-5c67-4a98-bf31-12c0f6c10293","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/88/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:16.452Z","lastSeenAt":"2026-04-28T04:04:34.779Z"}],"details":{"listingId":"c6ec6c76-5c67-4a98-bf31-12c0f6c10293","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/88/balance\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment to receive data.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000 (0.02 USD)","source_url":"https://lowpaymentfee.com/api/v1/accounts/88/balance"},{"claim":"Platform lists all APIs at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/88/balance"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying an account balance via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand balance data without API key management","Low-volume, pay-as-you-go API consumption"],"notFor":["High-volume balance queries where per-call fees add up","Use cases requiring detailed API documentation or guaranteed SLAs","Users who need clear schema definitions before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.625Z"},"updatedAt":"2026-04-28T04:04:34.779Z"}}