{"id":"0f967f55-5819-40cc-9f14-073aba89fa7b","shortId":"SAmprL","kind":"x402","title":"Check account balance via x402-paid API on Base network for $0.02 per request.","tagline":"Check account balance via x402-paid API on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information for a specific account (ID 180) via an x402-gated POST request. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request through the x402 payment protocol.\n\nThe provider operates a broader platform offering multiple API categories including data & analytics, AI & machine learning (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 listed at $0.02 per request with the same pay-per-use model.\n\nThe specific endpoint probed (/api/v1/accounts/180/balance) is live and returns a valid x402 challenge. However, 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 balance response actually contains. The endpoint's purpose and response format must be inferred from the URL path alone.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No request or response schema provided; actual response format is unknown","The endpoint path references a hardcoded account ID (180); unclear if this is parameterizable or a fixed resource","Provider platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/180/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/180/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 OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no technical content. The purpose and response format of this specific endpoint are inferred solely from the URL 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'0.02':13,28,62,134 '000':66 '180':44 '20':65 '6':70 'Base network API' 'USDC micropayment API' 'access':80 'account':2,17,36,42 'account balance API' 'account-balance' 'actual':198 'ai':104 'alon':214 'analysi':108 'analyt':103 'api':8,23,73,99,165 'balanc':3,18,37,196 'base':10,25,59,67 'broader':95 'call':64 'categori':100 'challeng':157 'check':1,16 'classif':110 'connect':174 'contain':199 'convers':127 'data':102 'decim':71 'descript':192 'detail':181 'doc':164 'document':159 'embed':111 'endpoint':32,130,147,201 'estim':121 'exampl':189 'exchang':116 'extrem':161 'feed':115 'financ':112 'format':206 'gas':120 'gate':49 'generat':128 'geocod':125 'grant':82 'howev':158 'id':43 'includ':101 'infer':209 'inform':38 'infrastructur':123 'key':74 'learn':106 'limit':77 'list':132 'live':151 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':105 'model':144 'multipl':98 'must':207 'network':11,26,60 'no-api-key' 'offer':97 'openapi':185 'oper':93 'page':169 'paid':7,22 'path':213 'pay':141 'pay-per-call balance' 'pay-per-request' 'pay-per-us':140 'payment':52,89 'per':14,29,63,84,135,142 'per-request':83 'platform':96 'post':50 'price':114,166 'probe':148 'prompt':176 'protocol':90 'provid':92 'purpos':203 'quot':119 'rate':76,117 'readm':168 'render':171 'request':15,30,51,85,136 'request/response':188 'requir':79 'respons':197,205 'return':35,153 'schema':186 'sentiment':107 'settl':54 'spars':162 'specif':41,146 'summar':109 'technic':180 'token':118 'unit':68 'url':212 'usdc':56 'usdc-base-network' 'use':143 'util':124 'valid':126,155 'via':4,19,45 'wallet':175 'web3':113 'x402':6,21,48,88,156 'x402 balance check' 'x402-gated':47 'x402-paid':5,20 'x402-payment'","prices":[{"id":"fe4dc96b-9bf4-4a6d-8022-8ea590f06096","listingId":"0f967f55-5819-40cc-9f14-073aba89fa7b","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/180/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":"2026-04-18T18:41:31.315Z"}],"sources":[{"listingId":"0f967f55-5819-40cc-9f14-073aba89fa7b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/180/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:31.315Z","lastSeenAt":"2026-04-30T11:03:55.518Z"}],"details":{"listingId":"0f967f55-5819-40cc-9f14-073aba89fa7b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/180/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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/180/balance"},{"claim":"All endpoints priced 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/180/balance"}],"useCases":["Querying account balance data without managing API keys","Programmatic balance lookups settled via USDC micropayments","Agent-driven financial data retrieval with per-request payment"],"bestFor":["Developers wanting keyless, pay-per-use account balance queries","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["High-volume balance polling where per-request fees add up quickly","Users who need detailed API documentation or response schema guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.011Z"},"updatedAt":"2026-04-30T11:03:55.518Z"}}