{"id":"12610267-fc79-4bcc-b27a-0138e2d91d7d","shortId":"wdsbNm","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\" resource at the path `/api/v1/accounts/76/balance`. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint probed returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is settled on-chain to address 0x1A2B…85F3 with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises no API keys, no rate limits, and instant access — the only authentication mechanism is the x402 payment header. Documentation pages (/docs, /pricing, /api, /README) all appear to require a wallet connection and returned no substantive content during the crawl, so the actual response schema and detailed behavior of this particular balance endpoint are unknown. The endpoint name suggests it returns account balance information for account ID 76, but without documentation or example responses this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","account-balance","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) returned no content — all require wallet connection","No OpenAPI or schema describing request parameters or response format","The specific purpose of 'accounts/76/balance' is unclear — it may be a demo or placeholder endpoint","No example responses available to verify what data is actually returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/76/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/76/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, but there is no OpenAPI schema, no documentation content (all doc pages require wallet connection), no example request/response, and the purpose of this specific endpoint (account 76 balance) is unclear. Effectively a stub 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'/api/v1/accounts/76/balance':42 '/docs':173 '/pricing':174 '/readme':176 '/request':123 '0.02':110,122 '000':93 '0x1a2b':135 '0x8335':98 '20':92 '2913':99 '300':139 '6':105 '76':219 '85f3':136 'Base network API' 'USDC micropayment API' 'accept':144 'access':37,161 'account':4,18,213,217 'account balance API' 'account-balance' 'across':124 'actual':194 'address':134 'advertis':118,152 'ai/ml':63 'analyt':62 'api':36,58,154 'appear':178 'application/json':149 'authent':164 'balanc':5,19,203,214 'base':8,22,79,94,101 'base-network' 'behavior':199 'broader':48 'call':12,26 'chain':132 'challeng':88 'connect':183 'consist':113 'content':188 'crawl':191 'crypto payment API' 'data':61,66 'decim':106 'detail':198 'document':171,222 'dozen':52 'endpoint':6,20,30,59,83,126,143,204,208 'exampl':224 'finance/web3':65 'flat':119 'gate':3,17,71 'header':170 'id':218 'infer':64 'inform':215 'instant':160 'json-response' 'key':155 'limit':158 'lowpaymentfee' 'lowpaymentfee.com':32 'mechan':165 'name':209 'network':80 'no-api-key' 'offer':51 'on-chain':130 'page':172 'part':45 'particular':202 'path':41 'pay':10,24,55 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':54 'payment':75,127,169 'per':11,25,56,111 'platform':49,151 'post':145 'premium':35 'price':120 'probe':84 'protocol':76 'provid':33 'rate':157 'request':57,89,112,146 'requir':180 'resourc':38 'respons':195,225 'return':85,148,185,212 'schema':196 'second':140 'servic':69 'settl':129 'sinc':102 'site':116 'span':60 'specif':82 'specul':228 'substant':187 'suggest':210 'timeout':141 'translat':108 'unit':95 'unknown':206 'usdc':14,28,97,103 'usdc-settlement' 'use':104 'util':68 'via':72 'wallet':182 'without':221 'x402':2,16,74,87,168 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"eb26dbce-3483-409b-9bfb-9ce9f17aea9d","listingId":"12610267-fc79-4bcc-b27a-0138e2d91d7d","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/76/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":"2026-04-18T18:40:06.717Z"}],"sources":[{"listingId":"12610267-fc79-4bcc-b27a-0138e2d91d7d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/76/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:06.717Z","lastSeenAt":"2026-04-28T03:33:09.294Z"}],"details":{"listingId":"12610267-fc79-4bcc-b27a-0138e2d91d7d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/76/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 requesting up to 20,000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/accounts/76/balance"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/76/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Agent-driven financial data retrieval without API key management","Programmatic access to account information via x402 protocol"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible agents settling payments on Base in USDC","Scenarios requiring no subscription or rate-limit constraints"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.064Z"},"updatedAt":"2026-04-28T03:33:09.294Z"}}