{"id":"b9829ca1-6139-40e2-8b77-e14ab994bae3","shortId":"LWGgJ9","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 a \"Premium API Access\" account balance query via the x402 payment protocol. When called without payment, it returns a 402 challenge requiring a USDC payment on the Base network. The specific endpoint `/api/v1/accounts/59/balance` appears to return balance information for account ID 59, though the exact response schema is not documented.\n\nThe provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML (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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe probed endpoint's x402 challenge specifies a maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, 6 decimals), which equals $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme. The endpoint accepts POST requests and returns application/json. Documentation beyond the landing page is essentially empty — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages are empty","No response schema or example responses provided","Purpose of 'accounts/59/balance' endpoint is unclear — no description of what balance data is returned","Provider site appears to be a generic x402 demo platform; reliability and data quality are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/59/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/59/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request parameters, response schema, or what 'account 59 balance' actually returns. The docs, pricing, and README pages are all blank beyond a wallet connect prompt. This is effectively a stub 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'/api/v1/accounts/59/balance':66 '/docs':199 '/pricing':200 '/readme':203 '0.02':127,169 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':164 '20000':158 '402':53 '59':75 '6':165 'Base network API' 'USDC micropayment API' 'accept':184 'access':37 'account':4,18,38,73 'account balance API' 'account-balance' 'address':176 'ai/ml':99 'analysi':101 'analyt':98 'api':36,95,139 'appear':67 'application/json':189 'asset':163 'balanc':5,19,39,70 'base':8,22,61,135,159 'beyond':191 'broader':89 'call':12,26,47,171 'challeng':54,153 'classif':103 'commit':146 'connect':209 'content':215 'convers':120 'crypto payment API' 'data':97 'decim':166 'document':83,190 'embed':104 'empti':197 'endpoint':6,20,30,65,123,150,183 'equal':168 'essenti':196 'estim':114 'exact':78,180 'exchang':109 'feed':108 'financ':105 'gas':113 'gate':3,17,94 'generat':121 'geocod':118 'host':87 'id':74 'inform':71 'infrastructur':116 'key':140 'land':193 'limit':143 'list':125 'lowpaymentfee' 'lowpaymentfee.com':32,86 'maxamountrequir':156 'network':62,136 'no-api-key' 'page':194,204 'paid':130 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':44,49,58,172 'per':11,25,128,170 'post':185 'premium':35 'price':107 'probe':149 'prompt':211 'protocol':45 'provid':33,85 'queri':40 'quot':112 'rate':110,142 'render':206 'request':129,186 'requir':55,147 'respons':79 'return':51,69,188 'schema':80 'scheme':181 'sent':174 'sentiment':100 'span':96 'specif':64 'specifi':154 'suit':90 'summar':102 'though':76 'token':111 'unit':160 'usdc':14,28,57,132,162 'usdc-base' 'use':178 'util':117 'valid':119 'via':41 'wallet':210 'web3':106 'without':48 'x402':2,16,43,93,152 'x402 API' 'x402-gated':1,15,92 'x402-payment'","prices":[{"id":"87ee594c-6374-4a85-b6b4-896c74d55167","listingId":"b9829ca1-6139-40e2-8b77-e14ab994bae3","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/59/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":"2026-04-18T18:39:52.931Z"}],"sources":[{"listingId":"b9829ca1-6139-40e2-8b77-e14ab994bae3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/59/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:52.931Z","lastSeenAt":"2026-04-28T05:33:51.088Z"}],"details":{"listingId":"b9829ca1-6139-40e2-8b77-e14ab994bae3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/59/balance\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to get the actual response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/59/balance"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/59/balance"},{"claim":"The provider offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data via a single paid API call","Integrating pay-per-use balance lookups into agent workflows","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing on-demand account balance queries without API key management","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["High-volume balance queries where per-call 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":"2026-02-17T23:14:37.704Z"},"updatedAt":"2026-04-28T05:33:51.088Z"}}