{"id":"fdb2c06a-1dd4-4b53-ac4b-4bad17f1c2f3","shortId":"GtMdyS","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/19/balance` is described as \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20,000 base units with USDC's 6 decimals = $0.02).\n\nlowpaymentfee.com hosts a broader suite of pay-per-call 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 no minimum commitments. Payments use the x402 \"exact\" scheme on the Base L2 network.\n\nDocumentation 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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data returned after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-request API","Base network API","lowpaymentfee"],"warnings":["No API documentation available; docs/pricing/README pages all render only 'Connect wallet'","No OpenAPI or output schema provided — response format after payment is unknown","The specific meaning of 'accounts/19/balance' is undocumented; it is unclear what account or balance is being queried","No request body schema documented for the POST method"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/19/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/19/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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (account 19 balance) is unclear beyond the generic 'Premium API Access' 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'0.02':73,87,138 '000':79 '20':78 '402':212 '6':85 'Base network API' 'USDC micropayment API' 'accept':54 'access':52 'account':4,18,35 'account balance API' 'account-balance' 'actual':216 'ai':107 'analysi':111 'analyt':101 'api':51,98,143,169 'avail':199 'balanc':5,19,36 'base':8,22,70,80,160 'base-network' 'broader':91 'call':12,26,97 'challeng':62,213 'classif':114 'commit':151 'confirm':207 'connect':178 'convers':131 'crawl':202 'data':100,104,217 'decim':86 'describ':48 'detail':185 'doc':168 'document':163,194 'embed':115 'endpoint':6,20,30,134,205 'estim':125 'exact':156 'exampl':198 'exchang':120 'export':105 'extrem':165 'feed':119 'financ':116 'gas':124 'gate':3,17,57 'generat':132 'geocod':129 'host':89 'infrastructur':127 'insight':106 'key':144 'l2':161 'learn':109 'limit':147 'list':136 'live':208 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,88 'machin':108 'materi':203 'maxamountrequir':76 'metric':102 'minimum':150 'network':71,162 'no-api-key' 'openapi':189 'page':173 'pay':10,24,95 'pay-per-cal':9,23,94 'pay-per-call' 'pay-per-request API' 'payment':41,61,63,152,220 'per':11,25,74,96,139 'post':55 'premium':50 'price':118,170 'prompt':180 'proper':211 'protocol':42 'provid':33 'quot':123 'rate':121,146 'readm':172 'render':175 'report':103 'request':56,75,140 'request/response':192 'resourc':45 'return':209,218 'schema':193 'scheme':157 'sentiment':110 'settl':65 'span':99 'spars':166 'spec':190 'specif':44 'suit':92 'summar':113 'technic':184 'text':112 'token':122 'unit':81 'unknown':222 'usag':197 'usdc':14,28,67,83 'usdc-settlement' 'use':153 'util':128 'valid':130 'via':38 'wallet':179 'web3':117 'x402':2,16,40,60,155 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bec9669c-4e8b-4bf0-b5ea-de53e350f298","listingId":"fdb2c06a-1dd4-4b53-ac4b-4bad17f1c2f3","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/19/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":"2026-04-18T18:39:19.036Z"}],"sources":[{"listingId":"fdb2c06a-1dd4-4b53-ac4b-4bad17f1c2f3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/19/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:19.036Z","lastSeenAt":"2026-04-29T06:33:41.997Z"}],"details":{"listingId":"fdb2c06a-1dd4-4b53-ac4b-4bad17f1c2f3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/19/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 endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/19/balance"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/19/balance"},{"claim":"The site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data behind a per-call USDC paywall","Programmatic access to financial account information without API key management","Agent-driven balance lookups settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer no-commitment, no-rate-limit API consumption"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","High-volume batch queries where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.211Z"},"updatedAt":"2026-04-29T06:33:41.997Z"}}