{"id":"b15180fe-f9c5-4b69-b219-e9cc76120b38","shortId":"zAGucW","kind":"x402","title":"x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides a premium API access point for retrieving account balance information (account ID 192). It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs—all gated behind the x402 payment protocol on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) with a maximum amount required of 20,000 base units, which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscriptions—callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.\n\nDocumentation on the site is extremely sparse; the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. The specific input schema for this balance endpoint and the structure of its response are not documented. The platform advertises uniform $0.02 pricing across all endpoints and claims instant access with no commitments.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","json-response","no-api-key","pay-per-request"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC-gated API","Base network API","pay-per-call balance","crypto payment API","lowpaymentfee"],"warnings":["No API documentation available—docs, pricing, and README pages all show only 'Connect wallet'","No input or output schema documented for this specific endpoint","The broader platform lists many endpoints but none have detailed specs","Purpose and data returned by /accounts/192/balance is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/192/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/192/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 (402 challenge captured) and pricing is clear, but there is no documentation on request/response schemas, no OpenAPI spec, and the docs pages are empty. The specific functionality of this balance endpoint is 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'000':99 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':89 '192':46 '20':98 '6':108 'Base network API' 'USDC-gated API' 'accept':77 'access':37,136,193 'account':4,18,41,44 'account balance API' 'account-balance' 'across':187 'addit':161 'advertis':183 'ai/ml':57 'amount':95 'analyt':56 'api':36,63,113 'attach':123 'balanc':5,19,42,170 'base':8,22,73,91,100 'base-network' 'behind':66 'broader':52 'caller':121 'claim':191 'commit':196 'connect':156 'contract':88 'crypto payment API' 'data':55 'decim':109 'detail':163 'doc':147 'document':139,180 'endpoint':6,20,30,76,171,189 'equal':103 'extrem':144 'finance/web3':59 'gate':3,17,65 'given':105 'header':128 'id':45 'infer':58 'inform':43 'infrastructur':61 'input':166 'instant':192 'json':82 'json-response' 'key':114 'limit':117 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':94 'network':74 'no-api-key' 'offer':54 'page':151 'part':49 'pay':9,23 'pay-per-call balance' 'pay-per-request' 'payment':69,83,127,133 'per':11,25 'platform':53,182 'point':38 'post':78 'premium':35 'price':148,186 'prompt':158 'proof':134 'protocol':70 'provid':33 'rate':116 'readm':150 'render':153 'request':12,26,79 'requir':96 'resourc':138 'respons':177 'retriev':40 'return':81 'schema':167 'settl':85 'simpli':122 'site':142 'spars':145 'specif':165 'structur':174 'subscript':120 'technic':162 'uniform':184 'unit':101 'usdc':14,28,87,106 'usdc-settlement' 'util':62 'valid':131 'wallet':157 'x':126 'x-payment':125 'x402':2,16,68,132 'x402 balance check' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c092669f-3ff1-42a9-9838-fe9131a09a76","listingId":"b15180fe-f9c5-4b69-b219-e9cc76120b38","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/192/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":"2026-04-18T18:41:42.773Z"}],"sources":[{"listingId":"b15180fe-f9c5-4b69-b219-e9cc76120b38","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/192/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:42.773Z","lastSeenAt":"2026-04-27T16:34:08.862Z"}],"details":{"listingId":"b15180fe-f9c5-4b69-b219-e9cc76120b38","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/192/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 challenge requiring USDC payment of 20000 base units (=$0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/192/balance"},{"claim":"Platform advertises $0.02/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/192/balance"}],"useCases":["Retrieving account balance information programmatically with per-request USDC payment","Integrating pay-per-use balance queries into autonomous agent workflows","Accessing financial data without managing API keys or subscriptions"],"bestFor":["Agents or services that need on-demand balance lookups without subscription overhead","Developers experimenting with x402 payment-gated APIs on Base","Workflows requiring keyless, permissionless API access settled in USDC"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.37Z"},"updatedAt":"2026-04-27T16:34:08.862Z"}}