{"id":"2c463b0b-3087-44bf-aa90-889770fb4cc7","shortId":"fw9ezX","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/75/balance` is described as \"Premium API Access\" and returns JSON data when a valid x402 payment header is supplied. Payment is settled in USDC on the Base network using the \"exact\" scheme, with a maximum cost of $0.02 per request (20,000 base units of USDC at 6 decimals).\n\nlowpaymentfee.com hosts a broader suite of x402-gated 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 required. The site advertises instant access via the Base network.\n\nDocumentation 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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual response format and input parameters for this specific balance endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for request or response formats","The specific meaning of 'accounts/75/balance' is undocumented — unclear what account 75 refers to","The broader site lists many endpoints but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/75/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/75/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). 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 75 balance) is opaque. Effectively a stub 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'/api/v1/accounts/75/balance':46 '/docs':177 '/pricing':179 '/readme':181 '0.02':83,144 '000':87 '20':86 '402':220 '6':93 'Base network API' 'USDC micropayment API' 'access':52,163 'account':4,18,35 'account balance API' 'account-balance' 'actual':225 'advertis':161 'ai':113 'analysi':117 'analyt':107 'api':51,104,149 'avail':208 'balanc':5,19,36,234 'base':8,22,72,88,166 'base-network' 'beyond':169 'broader':98 'call':12,26 'challeng':222 'classif':120 'commit':157 'confirm':215 'connect':187 'convers':137 'cost':81 'crawl':211 'crypto payment API' 'data':56,106,110 'decim':94 'describ':48 'detail':194 'document':168,203 'embed':121 'endpoint':6,20,30,140,213,235 'estim':131 'exact':76 'exampl':207 'exchang':126 'export':111 'extrem':174 'feed':125 'financ':122 'format':227 'gas':130 'gate':3,17,103 'generat':138 'geocod':135 'header':62 'host':96 'infrastructur':133 'input':229 'insight':112 'instant':162 'json':55 'json-response' 'key':150 'land':171 'learn':115 'limit':153 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'x402-payment'","prices":[{"id":"1026cdff-e85f-482b-9ace-4137421bdb04","listingId":"2c463b0b-3087-44bf-aa90-889770fb4cc7","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/75/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":"2026-04-18T18:40:06.089Z"}],"sources":[{"listingId":"2c463b0b-3087-44bf-aa90-889770fb4cc7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/75/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:06.089Z","lastSeenAt":"2026-04-29T05:05:58.243Z"}],"details":{"listingId":"2c463b0b-3087-44bf-aa90-889770fb4cc7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/75/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/75/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/75/balance"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data with per-call USDC micropayments","Integrating x402-compatible payment flows into agent workflows","Accessing financial data without traditional API key management"],"bestFor":["Agents or services that already support x402 payment protocol","Developers wanting keyless, pay-per-use API access on Base","Low-volume or sporadic queries where subscription pricing is wasteful"],"notFor":["High-volume use cases where $0.02/request adds up significantly","Users who need detailed API documentation or SDKs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.097Z"},"updatedAt":"2026-04-29T05:05:58.243Z"}}