{"id":"bc308ab9-865c-45e4-91d4-a683071f06f0","shortId":"nNBsV3","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 pay-per-request \"Premium API Access\" resource at the path `/api/v1/accounts/101/balance`. It is part of a broader platform that offers dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint probed (`/api/v1/accounts/101/balance`) returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 protocol (version 1) using the \"exact\" scheme, with a 300-second timeout. The response MIME type is `application/json`. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint name (\"accounts/101/balance\") suggests it returns balance information for a specific account, but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","account-balance","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-settled API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","The specific functionality of /api/v1/accounts/101/balance is inferred solely from the URL path","The broader platform advertises many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/101/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/101/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, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific endpoint (account balance for account 101) is only inferable from the URL path. Effectively a stub 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'0.02':76,111 '000':100 '0x8335':105 '1':125 '20':99 '2913':106 '300':132 '402':94 '6':115 'Base network API' 'USDC pay-per-call' 'access':41,149 'account':4,18,213 'account balance API' 'account-balance' 'accounts/101/balance':204 'addit':181 'advertis':148 'ai/ml':66 'analyt':65 'api':40,61,142,168 'application/json':140 'avail':197 'balanc':5,19,208 'base':8,22,85,101,108 'base-network' 'bodi':218 'broader':52 'call':12,26,156 'challeng':95 'connect':176 'content':183 'crawl':200 'crypto-settled API' 'data':64,69 'decim':116 'doc':166 'document':158,192 'dozen':56 'endpoint':6,20,30,62,89,202 'equal':110 'exact':128,216 'exampl':196 'extrem':163 'finance/web3':68 'format':219 'gate':3,17,60 'given':112 'grant':151 'infer':67 'inform':209 'json-response' 'key':143 'limit':146 'lowpaymentfee' 'lowpaymentfee.com':32 'made':119 'micropay':157 'mime':137 'name':203 'network':86 'offer':55 'openapi':187 'page':171 'part':49 'path':45 'pay':10,24,36 'pay-per-cal':9,23 'pay-per-request':35 'payment':117 'per':11,25,37,77,155 'per-cal':154 'platform':53 'premium':39 'premium API access' 'price':74,167 'probe':90 'prompt':178 'protocol':123 'provid':33 'pure':152 'rate':145 'readm':170 'render':173 'request':38,78,96,217 'request/response':190 'resourc':42 'respons':136,221 'return':92,207 'schema':191 'scheme':129 'second':133 'servic':72 'settl':80 'site':161 'span':63 'spec':188 'specif':88,212 'structur':222 'suggest':205 'technic':182 'thin':164 'timeout':134 'type':138 'unit':102 'unknown':224 'usag':195 'usdc':14,28,82,104,113 'usdc-settlement' 'use':126 'util':71 'version':124 'via':120 'wallet':177 'x402':2,16,59,122 'x402 micropayment API' 'x402-gated':1,15,58 'x402-payment'","prices":[{"id":"2cfc1f2f-e3b8-4de0-abc1-06e797caf9a3","listingId":"bc308ab9-865c-45e4-91d4-a683071f06f0","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/101/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":"2026-04-18T18:40:35.263Z"}],"sources":[{"listingId":"bc308ab9-865c-45e4-91d4-a683071f06f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/101/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:35.263Z","lastSeenAt":"2026-04-27T22:32:47.248Z"}],"details":{"listingId":"bc308ab9-865c-45e4-91d4-a683071f06f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/101/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 requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/accounts/101/balance"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-call USDC micropayments","Integrating pay-as-you-go financial data into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need on-demand account balance lookups without API key management","Low-volume, pay-per-use access to financial data"],"notFor":["High-volume production workloads requiring documented SLAs and schemas","Users who need detailed API documentation or client libraries before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.686Z"},"updatedAt":"2026-04-27T22:32:47.248Z"}}