{"id":"0d9ac82b-29e8-4c79-bade-37adac4603b3","shortId":"HQWEX2","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/172/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts POST requests, returning JSON responses.\n\nThe parent site lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data & analytics, AI/ML inference (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 advertised at $0.02 per request with no API keys, no rate limits, and no commitments required. Payment settles in USDC on the Base L2 network.\n\nThe probed endpoint charges a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per call. The x402 challenge specifies the \"exact\" payment scheme, a 300-second timeout, and pays to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The actual response schema and input parameters for this specific balance endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC payment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No API documentation available — all doc pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific meaning of 'accounts/172/balance' is undocumented — unclear what account 172 represents","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/172/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/172/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/call in USDC on Base). However, there is no documentation for the balance endpoint's input parameters or response schema, no OpenAPI spec, and all doc pages render only 'Connect wallet'. The specific purpose of account 172's balance is 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'0.02':121,161 '000':152 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':180 '20':151 '300':173 '6':157 'Base network API' 'USDC payment API' 'accept':69 'account':4,18,35 'account balance API' 'account-balance' 'actual':207 'address':179 'advertis':119 'ai/ml':92 'analysi':95 'analyt':91 'api':88,126,190 'balanc':5,19,36,216 'base':8,22,58,141,153 'behind':49 'broader':81 'call':12,26,87,163 'challeng':62,166 'charg':147 'classif':97 'commit':133 'confirm':63 'connect':199 'content':205 'convers':114 'crypto payment endpoint' 'data':90 'decim':158 'doc':189 'document':181 'embed':98 'endpoint':6,20,30,65,117,146,217 'equal':160 'estim':108 'exact':169 'exchang':103 'extrem':186 'feed':102 'financ':99 'gas':107 'gate':3,17,48 'generat':115 'geocod':112 'host':79 'infer':93 'infrastructur':110 'input':211 'json':73 'json-response' 'key':127 'l2':142 'limit':130 'live':67 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,78 'maximum':149 'network':59,143 'no-api-key' 'page':194 'paramet':212 'parent':76 'pay':10,24,85,177 'pay-per-cal':9,23,84 'pay-per-call API' 'pay-per-request' 'payment':41,55,135,170 'per':11,25,52,86,122,162 'per-request':51 'post':70 'price':101,191 'probe':145 'prompt':201 'protocol':42 'provid':33 'quot':106 'rate':104,129 'readm':193 'render':196 'request':53,71,123 'requir':134 'resourc':45 'respons':74,208 'return':72 'schema':209 'scheme':171 'second':174 'sentiment':94 'settl':136 'site':77,184 'span':89 'spars':187 'specif':44,215 'specifi':167 'suit':82 'summar':96 'timeout':175 'token':105 'undocu':219 'unit':154 'usdc':14,28,54,138,156 'usdc-base' 'util':111 'valid':113 'via':38 'wallet':200 'web3':100 'x402':2,16,40,61,165 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bbf7d06a-da17-4257-9d36-1441af1b4871","listingId":"0d9ac82b-29e8-4c79-bade-37adac4603b3","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/172/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":"2026-04-18T18:41:27.100Z"}],"sources":[{"listingId":"0d9ac82b-29e8-4c79-bade-37adac4603b3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/172/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:27.100Z","lastSeenAt":"2026-04-27T19:33:55.535Z"}],"details":{"listingId":"0d9ac82b-29e8-4c79-bade-37adac4603b3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/172/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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/172/balance"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/172/balance"}],"useCases":["Querying account balance information via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Agents needing on-demand account balance data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["High-volume balance queries where per-call fees add up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.148Z"},"updatedAt":"2026-04-27T19:33:55.535Z"}}