{"id":"c3d200ca-ca36-43b2-bfe6-9d2b7c57334a","shortId":"5ffySa","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information for a specific account (ID 119) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call API endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/119/balance` is accessed via HTTP POST and requires an X-PAYMENT header containing a valid x402 payment proof. The x402 challenge confirms the endpoint is live, accepting USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is gated purely by per-request micropayment.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the balance response contains. The platform's landing page lists many endpoints but provides no technical documentation beyond endpoint paths and prices. As a result, the exact shape of the response and the meaning of \"account 119 balance\" remain unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","crypto micropayment endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No request or response schema provided; the meaning of 'account 119 balance' is unknown","No OpenAPI spec or ai-plugin manifest found","The endpoint path is hardcoded to account ID 119; unclear if other account IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/119/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/119/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation: no OpenAPI schema, no request/response examples, no explanation of what 'accounts/119/balance' returns. Docs pages are empty. This is effectively a stub 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'0.02':11,24,74,132 '000':128 '0x8335':118 '119':40,230 '20':127 '2913':119 '6':136 'Base network API' 'USDC pay-per-call' 'accept':115 'access':90,146 'account':2,15,32,38,229 'account balance API' 'account-balance' 'across':61 'advertis':145 'ai/ml':64 'amount':125 'analyt':63 'api':59,139,164 'balanc':3,16,33,195,231 'base':8,21,83,121,129 'base-network' 'behind':41 'beyond':211 'broader':50 'call':58 'challeng':109 'check':1,14 'confirm':110 'connect':173 'contain':101,197 'content':179 'contract':117 'crypto micropayment endpoint' 'data':62,67 'decim':137 'descript':191 'detail':190 'doc':163 'document':155,210 'dozen':53 'endpoint':28,60,87,112,205,212 'exact':220 'exampl':187 'extrem':160 'finance/web3':66 'gate':148 'given':133 'header':100 'http':92 'i.e':131 'id':39 'infer':65 'inform':34 'infrastructur':69 'key':140 'land':201 'limit':143 'list':203 'live':114 'lowpaymentfee' 'lowpaymentfee.com':30 'mani':204 'maximum':124 'mean':227 'micropay':6,19,154 'micropayment API' 'network':9,22,84 'no-api-key' 'offer':52 'openapi':183 'page':168,202 'part':47 'path':213 'pay':56 'pay-per-cal':55 'pay-per-request' 'payment':99,105 'paywal':44 'per':12,25,57,75,152 'per-request':151 'platform':51,199 'post':93 'price':72,165,215 'prompt':175 'proof':106 'provid':207 'pure':149 'rate':142 'readm':167 'remain':232 'render':170 'request':13,26,76,153 'request/response':186 'requir':95 'respons':196,224 'result':218 'return':31 'schema':184 'settl':78 'shape':221 'site':158 'spars':161 'specif':37,86 'technic':209 'unclear':233 'unit':130 'usdc':80,116,134 'usdc-micropayment' 'util':70 'valid':103 'via':4,17,91 'wallet':174 'x':98 'x-payment':97 'x402':5,18,43,104,108 'x402 balance check' 'x402-payment'","prices":[{"id":"5be3ed85-b588-452f-91e6-f1b6bc7d9e84","listingId":"c3d200ca-ca36-43b2-bfe6-9d2b7c57334a","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/119/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":"2026-04-18T18:40:46.151Z"}],"sources":[{"listingId":"c3d200ca-ca36-43b2-bfe6-9d2b7c57334a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/119/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:46.151Z","lastSeenAt":"2026-04-27T22:32:47.628Z"}],"details":{"listingId":"c3d200ca-ca36-43b2-bfe6-9d2b7c57334a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/119/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 HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/119/balance"},{"claim":"All endpoints on the platform are priced at $0.02 per request 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/119/balance"},{"claim":"maxAmountRequired is 20000 base units, which equals $0.02 for USDC (6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/accounts/119/balance"}],"useCases":["Querying account balance data with per-request USDC micropayment","Integrating pay-per-call balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing on-demand account balance data without API key management","Low-volume, pay-as-you-go API consumption on Base network"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume balance queries where per-request fees add up quickly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.183Z"},"updatedAt":"2026-04-27T22:32:47.628Z"}}