{"id":"42415e2d-1e90-4ba2-b740-1abd8507c3f5","shortId":"Phv5MX","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/134/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts POST requests, returning JSON responses.\n\nThe parent site lowpaymentfee.com hosts a broader suite of pay-per-call 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 advertised at $0.02 per request with no API keys, no rate limits, and no commitments required. Payment settles in USDC on the Base L2 network.\n\nThe specific endpoint being listed here (`/accounts/134/balance`) charges a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per call — consistent with the site-wide pricing. The x402 challenge specifies the \"exact\" payment scheme, a 300-second timeout, and pays to address `0x1A2B...85F3`. No OpenAPI schema, detailed documentation, or example responses were found in the crawl; the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","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, pricing, and API pages all render only 'Connect wallet' with no content.","No OpenAPI or output schema provided; the response format is unknown.","The endpoint path includes a hardcoded account ID (134), suggesting this may be a demo or single-purpose resource rather than a general-purpose API.","No example responses or error handling documentation found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/134/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/134/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 confirmed) and pricing is clear ($0.02/call in USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response bodies, and the specific purpose of the /accounts/134/balance resource is unclear — it could be a demo or placeholder. Very limited information to work 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'/api/v1/accounts/134/balance':46 '0.02':121,165 '000':156 '0x1a2b':191 '20':155 '300':184 '6':161 '85f3':192 'Base network API' 'USDC micropayment API' 'accept':69 'account':4,18,35 'account balance API' 'account-balance' 'address':190 'advertis':119 'ai/ml':92 'analysi':95 'analyt':91 'api':88,126,210 'balanc':5,19,36 'base':8,22,58,141,157 'base-network' 'behind':49 'broader':81 'call':12,26,87,167 'challeng':62,177 'charg':151 'classif':97 'commit':133 'confirm':63 'connect':216 'consist':168 'content':222 'convers':114 'crawl':205 'crypto payment API' 'data':90 'decim':162 'detail':196 'doc':207 'document':197 'embed':98 'endpoint':6,20,30,65,117,146 'equal':164 'estim':108 'exact':180 'exampl':199 'exchang':103 'feed':102 'financ':99 'found':202 'gas':107 'gate':3,17,48 'generat':115 'geocod':112 'host':79 'infer':93 'infrastructur':110 'json':73 'json-response' 'key':127 'l2':142 'limit':130 'list':148 'live':67 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,78 'maximum':153 'network':59,143 'openapi':194 'page':211 'parent':76 'pay':10,24,85,188 'pay-per-cal':9,23,84 'pay-per-call' 'pay-per-request API' 'payment':41,55,135,181 'per':11,25,52,86,122,166 'per-request':51 'post':70 'price':101,174,208 'prompt':218 'protocol':42 'provid':33 'quot':106 'rate':104,129 'render':213 'request':53,71,123 'requir':134 'resourc':45 'respons':74,200 'return':72 'schema':195 'scheme':182 'second':185 'sentiment':94 'settl':136 'site':77,172 'site-wid':171 'span':89 'specif':44,145 'specifi':178 'suit':82 'summar':96 'timeout':186 'token':105 'unit':158 'usdc':14,28,54,138,160 'usdc-settlement' 'util':111 'valid':113 'via':38 'wallet':217 'web3':100 'wide':173 'x402':2,16,40,61,176 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"95d1e8d3-a8b7-4eae-a8d8-f86251f16b3b","listingId":"42415e2d-1e90-4ba2-b740-1abd8507c3f5","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/134/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":"2026-04-18T18:41:02.998Z"}],"sources":[{"listingId":"42415e2d-1e90-4ba2-b740-1abd8507c3f5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/134/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:02.998Z","lastSeenAt":"2026-04-29T03:33:52.850Z"}],"details":{"listingId":"42415e2d-1e90-4ba2-b740-1abd8507c3f5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/134/balance\n# Returns 402 with x402 payment challenge.\n# Attach X-PAYMENT header with a signed USDC payment on Base to receive the response.","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 network","source_url":"https://lowpaymentfee.com/api/v1/accounts/134/balance"},{"claim":"All endpoints are 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":"The site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/134/balance"}],"useCases":["Querying account balance data with per-call USDC micropayments","Integrating pay-as-you-go balance lookups into agent workflows","Accessing financial account data without API key registration"],"bestFor":["Agents or services that need on-demand account balance checks without subscription commitments","Developers experimenting with x402 payment-gated APIs on Base","Workflows requiring keyless, permissionless API access settled in USDC"],"notFor":["High-volume balance polling where per-call costs would accumulate quickly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.35Z"},"updatedAt":"2026-04-29T03:33:52.850Z"}}