{"id":"ff8cea71-ba09-4689-9b07-5f9fb2af6b87","shortId":"GTgWEH","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/147/balance` is described as \"Premium API Access\" and returns JSON data upon payment. It accepts POST requests and settles payments in USDC on the Base network.\n\nThe x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The provider's landing page confirms a flat $0.02/request pricing model across all their endpoints, with no API keys, no rate limits, and instant access. The endpoint is live and returns a proper 402 challenge with x402 version 1.\n\nlowpaymentfee.com hosts a broader suite of APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02 per-request pricing. However, this specific listing covers only the `/api/v1/accounts/147/balance` endpoint. Documentation beyond the landing page is sparse — the docs, API, pricing, and README pages all appear to require wallet connection and contain no substantive content.","tags":[],"capabilities":["account-balance","x402-payment","usdc-settlement","base-network","pay-per-call","json-response"],"categories":["finance","data"],"synonyms":["account balance API","balance lookup","x402 API","USDC micropayment API","pay-per-request API","lowpaymentfee"],"warnings":["No OpenAPI or detailed schema available for this endpoint","Documentation pages (docs, API, pricing, README) are all gated behind wallet connection and contain no visible content","The meaning of 'accounts/147/balance' is unclear — it is unknown what account 147 refers to or what data is returned","No example responses are available to verify the output format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/147/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/147/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 and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response bodies, and the purpose of 'account 147 balance' is entirely opaque. The docs/pricing/README pages are all blank (wallet-gated). This is effectively a stub 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'/request':108 '0.02':92,107,175 '000':81 '0x8335':86 '1':138 '20':80 '2913':87 '402':133 '6':97 'USDC micropayment API' 'accept':60 'access':52,124 'account':4,18,35 'account balance API' 'account-balance' 'across':111 'advertis':75 'ai/ml':149 'analysi':152 'analyt':148 'api':51,117,145,198 'appear':204 'balanc':5,19,36 'balance lookup' 'base':8,22,70,82,89 'base-network' 'beyond':190 'broader':142 'call':12,26 'challeng':74,134 'classif':154 'confirm':104 'connect':208 'contain':210 'content':213 'convers':169 'cost':78 'cover':184 'data':56,147,157 'decim':98 'describ':48 'doc':197 'document':189 'embed':155 'endpoint':6,20,30,114,126,171,188 'equal':91 'estim':163 'exchang':160 'feed':159 'finance/crypto':156 'flat':106 'gas':162 'gate':3,17 'geocod':167 'host':140 'howev':180 'infer':150 'infrastructur':165 'instant':123 'json':55 'json-response' 'key':118 'land':102,192 'limit':121 'list':183 'live':128 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,139 'maximum':77 'model':110 'network':71 'page':103,193,202 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':41,58,65 'per':11,25,93,177 'per-request':176 'post':61 'premium':50 'price':109,158,179,199 'proper':132 'protocol':42 'provid':33,100 'rate':120,161 'readm':201 'request':62,94,178 'requir':206 'resourc':45 'return':54,130 'sentiment':151 'settl':64 'share':172 'span':146 'spars':195 'specif':44,182 'substant':212 'suit':143 'summar':153 'unit':83 'upon':57 'usdc':14,28,67,85,95 'usdc-settlement' 'use':96 'util':166 'valid':168 'version':137 'via':38 'wallet':207 'x402':2,16,40,73,136 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6b5367cb-307e-48a6-ba6a-0d2323712715","listingId":"ff8cea71-ba09-4689-9b07-5f9fb2af6b87","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/147/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":"2026-04-18T18:41:04.782Z"}],"sources":[{"listingId":"ff8cea71-ba09-4689-9b07-5f9fb2af6b87","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/147/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:04.782Z","lastSeenAt":"2026-04-29T03:04:50.797Z"}],"details":{"listingId":"ff8cea71-ba09-4689-9b07-5f9fb2af6b87","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/147/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 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/147/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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/147/balance"}],"useCases":["Querying account balance data with per-call USDC micropayments","Integrating balance checks into agent workflows without API key management","Programmatic access to account information via x402 payment protocol"],"bestFor":["Agents or bots that need on-demand account balance data without subscription commitments","Developers exploring x402 pay-per-call patterns on Base","Low-volume or sporadic balance lookups where flat per-request pricing is economical"],"notFor":["High-volume balance queries where subscription pricing would be cheaper","Users who need detailed documentation or OpenAPI schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.245Z"},"updatedAt":"2026-04-29T03:04:50.797Z"}}