{"id":"7c86e9cc-cb8e-4481-a8fb-775015bfacec","shortId":"sLK9Np","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information for a specific account (account ID 167) behind an x402 paywall. The endpoint accepts POST requests and is settled in USDC on the Base network. Each call costs a maximum of $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe provider 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments — payment is handled entirely via the x402 protocol on the Base L2 network.\n\nThe specific endpoint being listed (`/api/v1/accounts/167/balance`) appears to be an account balance lookup. Documentation beyond the landing page 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 fields the balance response contains. Prospective callers should be aware that the actual behavior and response format of this endpoint are not documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All doc/pricing/API/README pages render only 'Connect wallet' with no technical content.","The endpoint path references a hardcoded account ID (167); it is unclear whether this is a demo or a production resource.","The broader API suite advertised on the landing page has not been independently verified beyond this single endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/167/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/167/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 with clear pricing, but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint (account 167 balance) is unclear and 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'0.02':11,24,66,121 '000':68 '167':41 '20':67 '6':74 'Base network API' 'USDC pay-per-call' 'accept':48 'account':2,15,32,38,39,158 'account balance API' 'account-balance' 'actual':213 'ai/ml':92 'analysi':95 'analyt':91 'api':88,126,171 'appear':154 'awar':210 'balanc':3,16,33,159,203 'base':8,21,58,69,145 'base-network' 'behavior':214 'behind':42 'beyond':162 'broader':81 'call':61,87 'caller':207 'check':1,14 'classif':97 'commit':134 'connect':180 'contain':205 'convers':114 'cost':62 'data':90 'decim':75 'descript':198 'detail':187 'doc':170 'document':161,223 'embed':98 'endpoint':28,47,117,150,220 'entir':138 'estim':108 'exampl':195 'exchang':103 'extrem':167 'feed':102 'field':201 'financ':99 'format':217 'gas':107 'generat':115 'geocod':112 'handl':137 'host':79 'id':40 'infer':93 'inform':34 'infrastructur':110 'key':127 'l2':146 'land':164 'limit':130 'list':152 'lookup':160 'lowpaymentfee' 'lowpaymentfee.com':30,78 'maximum':64 'micropay':6,19 'micropayment API' 'minimum':133 'network':9,22,59,147 'no-api-key' 'openapi':191 'page':165,175 'pay':85 'pay-per-cal':84 'pay-per-call' 'payment':135 'paywal':45 'per':12,25,86,122 'post':49 'price':101,119,172 'prompt':182 'prospect':206 'protocol':142 'provid':77 'quot':106 'rate':104,129 'readm':174 'render':177 'request':13,26,50,123 'request/response':194 'respons':204,216 'return':31 'schema':192 'sentiment':94 'settl':53 'span':89 'spars':168 'specif':37,149 'suit':82 'summar':96 'technic':186 'token':105 'unit':70 'usdc':55,72 'usdc-settlement' 'util':111 'valid':113 'via':4,17,139 'wallet':181 'web3':100 'x402':5,18,44,141 'x402 balance check' 'x402-payment'","prices":[{"id":"433ade5f-5ae8-47ac-a3e1-4a9a4f2fffc7","listingId":"7c86e9cc-cb8e-4481-a8fb-775015bfacec","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/167/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":"2026-04-18T18:41:19.927Z"}],"sources":[{"listingId":"7c86e9cc-cb8e-4481-a8fb-775015bfacec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/167/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:19.927Z","lastSeenAt":"2026-04-27T19:33:55.247Z"}],"details":{"listingId":"7c86e9cc-cb8e-4481-a8fb-775015bfacec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/167/balance\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with valid USDC payment on Base to receive the balance response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/167/balance"},{"claim":"Maximum amount required is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/167/balance"},{"claim":"All APIs 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":"Docs, API, pricing, and README pages show only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information programmatically with per-call USDC micropayments","Integrating balance lookups into agent workflows without pre-registration or API keys","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents needing keyless, on-demand account balance queries","Low-volume balance checks where $0.02/call is acceptable"],"notFor":["High-frequency balance polling where per-call costs would accumulate quickly","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.506Z"},"updatedAt":"2026-04-27T19:33:55.247Z"}}