{"id":"17091d83-d8d9-4ba5-9389-5140ef0b8916","shortId":"EckPDB","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/110/balance` is described as \"Premium API Access\" and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\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.\n\nHowever, the specific endpoint being listed here — `/api/v1/accounts/110/balance` — is not documented among the advertised APIs on the landing page. Its exact response schema and purpose are unclear. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional documentation. The endpoint is confirmed live via a valid 402 challenge, but the lack of documentation or schema details limits confidence in what it actually returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","json-response","pay-per-call"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["The endpoint /api/v1/accounts/110/balance is not listed among the platform's advertised APIs — its purpose and response format are unknown.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, output schema, or example responses are available.","The platform lists many other endpoints but none match this specific path, raising questions about what this endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/110/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/110/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 and returns a valid x402 challenge, but there is no documentation, no response schema, and the specific endpoint path (/api/v1/accounts/110/balance) is not listed among the platform's advertised APIs. The docs/pricing/API pages are all empty beyond a wallet connect prompt. This is effectively a stub 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'0.02':72,133 '000':76 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':66 '20':75 '402':199 '6':80 'Base network API' 'USDC micropayment API' 'access':52 'account':4,18,35 'account balance API' 'account-balance' 'actual':214 'addit':189 'advertis':86,160 'ai':102 'among':158 'analysi':106 'analyt':96 'api':51,93,138,161,178 'balanc':5,19,36 'base':8,22,61,77 'base-network' 'broader':83 'call':12,26 'challeng':200 'classif':109 'commit':146 'confid':210 'confirm':194 'connect':184 'contract':65 'convers':126 'cost':70 'data':95,99 'decim':81 'describ':48 'detail':208 'doc':175 'document':157,190,205 'embed':110 'endpoint':6,20,30,129,150,192 'estim':120 'exact':167 'exchang':115 'export':100 'feed':114 'financ':111 'gas':119 'gate':3,17,92 'generat':127 'geocod':124 'howev':147 'infrastructur':122 'insight':101 'json':55 'json-response' 'key':139 'lack':203 'land':164 'learn':104 'limit':142,209 'list':131,152 'live':195 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,84 'machin':103 'maximum':69 'metric':97 'minimum':145 'network':62 'page':165,179 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':41,56 'per':11,25,73,134 'platform':85 'premium':50 'price':113,176 'prompt':186 'protocol':42 'provid':33 'purpos':171 'quot':118 'rate':116,141 'report':98 'request':74,135 'resourc':45 'respons':168 'return':54,181,215 'schema':169,207 'sentiment':105 'settl':58 'span':94 'specif':44,149 'suit':88 'summar':108 'text':107 'token':117 'unclear':173 'unit':78 'usdc':14,28,64 'usdc-settlement' 'use':63 'util':123 'valid':125,198 'via':38,196 'wallet':185 'web3':112 'x402':2,16,40,91 'x402 API' 'x402-gated':1,15,90 'x402-payment'","prices":[{"id":"2f2aa2d7-814a-4993-b491-9ad963ff2b43","listingId":"17091d83-d8d9-4ba5-9389-5140ef0b8916","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/110/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":"2026-04-18T18:40:45.562Z"}],"sources":[{"listingId":"17091d83-d8d9-4ba5-9389-5140ef0b8916","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/110/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:45.562Z","lastSeenAt":"2026-04-27T22:32:47.586Z"}],"details":{"listingId":"17091d83-d8d9-4ba5-9389-5140ef0b8916","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/110/balance\n# 2. Parse the 402 response, construct an X-PAYMENT header with a signed USDC payment, and resend.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/110/balance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/110/balance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information via a pay-per-call model","Integrating x402-compatible payment flows into agent workflows","Accessing premium data without API key registration"],"bestFor":["Agents that support x402 payment protocol on Base","Use cases requiring no-signup, pay-as-you-go API access","Developers testing x402 micropayment integrations"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may not be economical","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.214Z"},"updatedAt":"2026-04-27T22:32:47.586Z"}}