{"id":"af40c21f-c8ca-4290-a74f-05a69d10502c","shortId":"peBbMC","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/189/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), settled to a specified wallet address. The endpoint accepts POST requests and returns JSON.\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 instant access via the Base network.\n\nHowever, the specific endpoint being listed here — `/api/v1/accounts/189/balance` — is not among the publicly documented APIs on the landing page. Its purpose (\"Premium API Access\") and response format are not documented beyond the x402 challenge metadata. There is no OpenAPI spec, no usage examples, and the docs/pricing/README pages returned only a wallet-connect prompt with no substantive content. Treat this as a minimally documented endpoint with verified liveness.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC gated API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available","Docs, pricing, and README pages return only a wallet-connect prompt with no content","This specific endpoint (/api/v1/accounts/189/balance) is not listed in the provider's public API catalog","Response format and fields are completely undocumented","The hardcoded account ID '189' in the path suggests this may be a single-account resource, not a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/189/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/189/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 (402 challenge verified) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no usage examples, and the docs pages are empty. The specific endpoint path (/api/v1/accounts/189/balance) is not listed among the provider's public API catalog, making its purpose 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'0.02':74,143 '000':69 '20':68 'Base network API' 'USDC gated API' 'accept':86 'access':155,183 'account':4,18,35 'account balance API' 'account-balance' 'address':83 'advertis':96 'ai':112 'among':170 'analysi':116 'analyt':106 'api':103,148,174,182 'balanc':5,19,36 'base':8,22,58,70,158 'behind':49 'beyond':190 'broader':93 'call':12,26 'challeng':62,193 'classif':119 'connect':212 'content':217 'convers':136 'cost':66 'data':105,109 'docs/pricing/readme':205 'document':173,189,223 'embed':120 'endpoint':6,20,30,85,139,163,224 'estim':130 'exampl':202 'exchang':125 'export':110 'feed':124 'financ':121 'format':186 'gas':129 'gate':3,17,48,102 'generat':137 'geocod':134 'howev':160 'indic':63 'infrastructur':132 'insight':111 'instant':154 'json':91 'json-response' 'key':149 'land':177 'learn':114 'limit':152 'list':141,165 'live':227 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,94 'machin':113 'maximum':65 'metadata':194 'metric':107 'minim':222 'network':59,159 'openapi':198 'page':178,206 'pay':10,24 'pay-per-cal':9,23 'pay-per-call balance' 'pay-per-request' 'payment':41,55 'per':11,25,52,76,144 'per-request':51 'platform':95 'post':87 'premium':181 'price':123 'prompt':213 'protocol':42 'provid':33 'public':172 'purpos':180 'quot':128 'rate':126,151 'report':108 'request':53,77,88,145 'resourc':45 'respons':185 'return':90,207 'sentiment':115 'settl':78 'span':104 'spec':199 'specif':44,162 'specifi':81 'substant':216 'suit':98 'summar':118 'text':117 'token':127 'treat':218 'unit':71 'usag':201 'usd':75 'usdc':14,28,54,73 'usdc-base' 'util':133 'valid':135 'verifi':226 'via':38,156 'wallet':82,211 'wallet-connect':210 'web3':122 'x402':2,16,40,61,101,192 'x402 balance check' 'x402-gated':1,15,100 'x402-payment'","prices":[{"id":"c67aff55-fd15-4217-a94a-22a884e593ad","listingId":"af40c21f-c8ca-4290-a74f-05a69d10502c","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/189/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":"2026-04-18T18:41:40.383Z"}],"sources":[{"listingId":"af40c21f-c8ca-4290-a74f-05a69d10502c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/189/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:40.383Z","lastSeenAt":"2026-04-27T18:07:21.709Z"}],"details":{"listingId":"af40c21f-c8ca-4290-a74f-05a69d10502c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/189/balance \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/189/balance"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 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-request model","Agent-initiated balance lookups without API key provisioning","Programmatic access to account data settled in USDC on Base"],"bestFor":["Agents needing keyless, pay-per-call account balance queries","Developers testing x402 payment flows on Base","Scenarios requiring no-signup instant API access"],"notFor":["High-volume balance polling where per-request fees add up","Users who need detailed API documentation or response schema guarantees","Production systems requiring SLA or uptime guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.495Z"},"updatedAt":"2026-04-27T18:07:21.709Z"}}