{"id":"5ae65783-e8c0-4b85-b1f1-4034fc1d4857","shortId":"j4gDFs","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides account balance information via a POST request, gated behind the x402 payment protocol. The specific resource is `/api/v1/accounts/27/balance`, which returns JSON data upon payment. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with the x402 \"exact\" scheme. The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02 USD per call. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header. The endpoint returned a valid 402 challenge during probing, confirming it is live.\n\nThe specific functionality of this particular endpoint (account balance for account ID 27) is not well-documented beyond the generic \"Premium API Access\" label. The broader site lists many endpoints but the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical documentation. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint appears functional but its exact input parameters and response shape are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","json-response","pay-per-request"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI spec or schema available for request or response","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no useful content","The endpoint path references a specific account ID (27) with no explanation of what this represents","No request body schema or response examples are available — integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/27/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/27/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 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages all render only 'Connect wallet' with no content. The specific purpose of this endpoint (account 27 balance) is unclear and 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'0.02':10,24,84,117 '000':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':97 '20':108 '27':167 '402':147 '6':114 'Base network API' 'USDC micropayment API' 'access':129,178 'account':4,18,34,162,165 'account balance API' 'account-balance' 'addit':202 'advertis':66,128 'ai':73 'amount':105 'analyt':72 'api':68,122,177 'appear':223 'avail':217 'balanc':5,19,35,163 'base':8,22,92,110 'base-network' 'behind':42 'beyond':173 'broader':63,181 'call':120 'categori':69 'challeng':148 'confirm':151 'connect':197 'contract':96 'crawl':220 'crypto payment endpoint' 'data':55,71 'decim':115 'doc':188 'document':172,204 'endpoint':6,20,30,143,161,185,222 'equal':116 'exact':101,227 'exampl':216 'financ':76 'function':157,224 'gate':3,17,41 'generic':175 'header':141 'id':166 'includ':70,135 'inform':36 'infrastructur':79 'input':228 'instant':131 'json':54 'json-response' 'key':123 'label':179 'learn':75 'limit':126 'list':183 'live':154 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':74 'mani':184 'maximum':104 'multipl':67 'network':93 'openapi':208 'page':192 'paramet':229 'part':60 'particular':160 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payment':45,57,87,133,140 'per':11,25,85,119 'platform':64 'post':39 'premium':176 'price':82,189 'probe':150 'prompt':199 'protocol':46 'provid':33 'rate':125 'readm':191 'render':194 'request':12,26,40,86 'request/response':211 'requir':106 'resourc':49 'respons':231 'return':53,144 'schema':212 'scheme':102 'settl':89 'shape':232 'site':182 'spec':209 'specif':48,156 'technic':203 'unit':111 'unknown':234 'upon':56 'usag':215 'usd':118 'usdc':14,28,95 'usdc-settlement' 'use':94 'util':80 'valid':146 'via':37 'wallet':198 'web3':77 'well':171 'well-docu':170 'x':139 'x-payment':138 'x402':2,16,44,100 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"05abcfd4-c758-4341-9680-8e0d47231562","listingId":"5ae65783-e8c0-4b85-b1f1-4034fc1d4857","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/27/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":"2026-04-18T18:39:28.128Z"}],"sources":[{"listingId":"5ae65783-e8c0-4b85-b1f1-4034fc1d4857","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/27/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:28.128Z","lastSeenAt":"2026-04-30T08:34:12.747Z"}],"details":{"listingId":"5ae65783-e8c0-4b85-b1f1-4034fc1d4857","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/27/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/27/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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/27/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating x402-compatible payment flows into agent workflows","Accessing financial account information without API key registration"],"bestFor":["Agents or services that already support x402 payment protocol","Use cases requiring keyless, pay-per-request API access on Base","Developers experimenting with x402 micropayment patterns"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.875Z"},"updatedAt":"2026-04-30T08:34:12.747Z"}}