{"id":"d7e140a7-c873-4b3a-9946-8b4531bd1ba9","shortId":"5QB7Nh","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 an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/96/balance` is described as \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broader catalog of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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.\n\nDocumentation 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 example payloads available. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual response format and required POST body for this specific account balance endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"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, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific functionality of /api/v1/accounts/96/balance is undocumented; 'Premium API Access' is a generic label","The broader catalog of endpoints listed on the homepage could not be verified individually"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/96/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/96/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 challenge and clear pricing ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and all doc pages render only 'Connect wallet'. The specific purpose of the /accounts/96/balance endpoint is unclear beyond its 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'/api/v1/accounts/96/balance':46 '/docs':155 '/pricing':157 '/readme':159 '0.02':10,24,85,135 '000':80 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':73 '20':79 '402':194 '6':89 'Base network API' 'USDC micropayment API' 'accept':54 'access':52 'account':4,18,35,212 'account balance API' 'account-balance' 'actual':202 'ai/ml':106 'amount':77 'analysi':109 'analyt':105 'api':51,102,140 'avail':186 'balanc':5,19,36,213 'base':8,22,68,81 'base-network' 'bodi':208 'broader':96 'catalog':97 'challeng':62,199 'classif':111 'commit':148 'confirm':190 'connect':165 'contract':72 'convers':128 'crypto payment API' 'data':104 'decim':90 'describ':48 'detail':172 'document':150,181 'embed':112 'endpoint':6,20,30,131,188,214 'equal':84 'estim':122 'exampl':184 'exchang':117 'extrem':152 'feed':116 'financ':113 'format':204 'gas':121 'gate':3,17,57,101 'generat':129 'geocod':126 'host':94 'http':193 'infer':107 'infrastructur':124 'key':141 'limit':144 'list':133 'live':191 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,93 'maximum':76 'minimum':147 'network':69 'no-api-key' 'openapi':176 'page':160 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payload':185 'payment':41,61,63 'per':11,25,136 'post':55,207 'premium':50 'price':115 'prompt':167 'protocol':42 'provid':33,92 'quot':120 'rate':118,143 'render':162 'request':12,26,56,137 'request/response':179 'requir':149,206 'resourc':45 'respons':203 'return':192 'schema':180 'sentiment':108 'settl':65 'span':103 'spars':153 'spec':177 'specif':44,211 'summar':110 'technic':171 'token':119 'unit':82 'unknown':216 'usd':86 'usdc':14,28,71,87 'usdc-settlement' 'use':70,88 'util':125 'valid':127,197 'via':38 'wallet':166 'web3':114 'x402':2,16,40,60,100,198 'x402 API' 'x402-gated':1,15,99 'x402-payment'","prices":[{"id":"cae9634f-f1a5-44de-813f-43503af748b1","listingId":"d7e140a7-c873-4b3a-9946-8b4531bd1ba9","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/96/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":"2026-04-18T18:40:21.344Z"}],"sources":[{"listingId":"d7e140a7-c873-4b3a-9946-8b4531bd1ba9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/96/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:21.344Z","lastSeenAt":"2026-04-28T02:33:33.871Z"}],"details":{"listingId":"d7e140a7-c873-4b3a-9946-8b4531bd1ba9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/96/balance\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge, maxAmountRequired 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/96/balance"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/96/balance"},{"claim":"Provider hosts additional API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating x402 payment-gated endpoints into agent workflows","Accessing financial data without API key registration"],"bestFor":["Agents or services that can settle x402 payments on Base in USDC","Developers wanting zero-signup, pay-per-use API access","Exploring x402 protocol integration patterns"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.28Z"},"updatedAt":"2026-04-28T02:33:33.871Z"}}