{"id":"36061add-2671-4adc-aea8-174a9c8e58df","shortId":"XJ9GJU","kind":"x402","title":"x402-payable account balance API on Base, settling in USDC at $0.02 per request.","tagline":"x402-payable account balance API on Base, settling in USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a premium API access point for retrieving account balance information (specifically account 81). It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs — all payable per-request via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/accounts/81/balance` accepts POST requests and returns JSON. Payment is handled inline: callers attach an X-PAYMENT header with a valid x402 payment proof. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. There are no API keys, no rate limits, and no subscription commitments — you pay per request.\n\nDocumentation on the site is extremely thin. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual response payload structure after successful payment is unknown. The platform advertises many other endpoints across analytics, AI, finance, and utility categories, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","per-request-pricing","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages are all empty","No OpenAPI or schema definition for request or response payloads","The specific functionality of /api/v1/accounts/81/balance is unclear — 'Premium API Access' is a generic label","Many advertised endpoints on the platform may be placeholders; no evidence they return real data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/81/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/81/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and all documentation pages are empty beyond a wallet connect prompt. The actual purpose and response format of this specific endpoint are unknown beyond the generic 'Premium API Access' 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'/api/v1/accounts/81/balance':84 '/docs':151 '/pricing':152 '/readme':155 '0.02':13,28,125,220 '000':116 '20':115 '402':189 '6':121 '81':48 'Base network API' 'USDC micropayment API' 'accept':85 'access':39 'account':4,19,43,47 'account balance API' 'account-balance' 'across':209 'actual':194 'advertis':205 'ai':211 'ai/ml':59 'amount':110 'analyt':58,210 'api':6,21,38,65,130 'attach':96 'balanc':5,20,44 'base':8,23,77,117 'base-network' 'broader':54 'call':113 'caller':95 'categori':215 'challeng':191 'commit':138 'confirm':184 'connect':161 'content':167 'crypto payment API' 'data':57 'decim':122 'document':143,176 'endpoint':32,83,182,208 'equal':124 'exampl':180 'extrem':148 'financ':212 'finance/web3':61 'handl':93 'header':101 'infer':60 'inform':45 'infrastructur':63 'inlin':94 'json':90 'json-response' 'key':131 'limit':134 'live':185 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':206 'maximum':109 'network':78 'no-api-key' 'offer':56 'openapi':171 'page':156 'part':51 'pay':140 'pay-per-call API' 'payabl':3,18,67 'payload':196 'payment':91,100,106,200 'per':14,29,69,112,141 'per-request':68 'per-request-pricing' 'platform':55,204 'point':40,222 'post':86 'premium':37 'price':221 'prompt':163 'proof':107 'proper':188 'protocol':74 'provid':35 'rate':133 'render':158 'request':15,30,70,87,142 'request/response':174 'requir':111 'respons':195 'retriev':42 'return':89,186 'schema':175 'settl':9,24 'site':146 'spec':172 'specif':46,82 'structur':197 'subscript':137 'success':199 'thin':149 'unit':118 'unknown':202 'usag':179 'usd':126 'usdc':11,26,80,120 'usdc-settlement' 'use':79 'util':64,214 'valid':104 'via':71 'wallet':162 'x':99 'x-payment':98 'x402':2,17,73,105,190 'x402 API' 'x402-payable':1,16 'x402-payment'","prices":[{"id":"f688b386-a2a7-4f67-b0d8-e4ea3ba67427","listingId":"36061add-2671-4adc-aea8-174a9c8e58df","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/81/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":"2026-04-18T18:40:10.936Z"}],"sources":[{"listingId":"36061add-2671-4adc-aea8-174a9c8e58df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/81/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:10.936Z","lastSeenAt":"2026-04-29T05:05:58.432Z"}],"details":{"listingId":"36061add-2671-4adc-aea8-174a9c8e58df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/81/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/81/balance"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/81/balance"}],"useCases":["Retrieving account balance data with per-request USDC micropayments","Integrating pay-per-call balance checks into agent workflows","Accessing financial account information without API key management"],"bestFor":["Agents or services that need on-demand account balance lookups without subscriptions","Developers experimenting with x402 protocol payments on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-volume balance polling where per-request costs would accumulate significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.864Z"},"updatedAt":"2026-04-29T05:05:58.432Z"}}