{"id":"75f6e47b-cc84-4212-bf77-e5a4b6aa8279","shortId":"9Y546f","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/133/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the provider's advertised flat $0.02/request pricing across all their API endpoints.\n\nThe provider, lowpaymentfee.com, hosts a broader suite 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 share the same $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments — payment is handled entirely via the x402 protocol using USDC on Base.\n\nThis particular endpoint appears to return account balance information in JSON format. However, documentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what parameters the endpoint accepts or what fields the response contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes integration speculative.","tags":[],"capabilities":["x402-payment","usdc-on-base","account-balance","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific endpoint path references a hardcoded account ID (133); unclear if this is parameterizable","Purpose and response format of the balance endpoint are entirely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/133/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/133/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 consistent pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose of this specific endpoint (account 133 balance) is unclear and undocumented, making this effectively a stub 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'/request':86,138 '0.02':74,85,137 '000':69 '20':68 '402':230 'Base network API' 'USDC micropayment API' 'accept':215 'account':4,18,35,170 'account balance API' 'account-balance' 'across':88 'advertis':83 'ai/ml':108 'analysi':111 'analyt':107 'api':91,104,143,185 'appear':167 'balanc':5,19,36,171 'base':8,22,58,70,163 'behind':49 'broader':98 'call':12,26 'challeng':62,231 'classif':113 'commit':151 'confirm':225 'connect':191 'consist':78 'contain':221 'convers':130 'cost':66 'data':106 'descript':209 'detail':198 'doc':182 'document':177,236 'embed':114 'endpoint':6,20,30,92,133,166,214,223 'entir':155 'estim':124 'exampl':206 'exchang':119 'extrem':179 'feed':118 'field':218 'financ':115 'flat':84 'format':175 'gas':123 'gate':3,17,48,103 'generat':131 'geocod':128 'handl':154 'host':96 'howev':176 'indic':63 'infer':109 'inform':172 'infrastructur':126 'integr':238 'json':174 'key':144 'lack':234 'limit':147 'live':226 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,95 'make':237 'maximum':65 'minimum':150 'model':140 'network':59 'no-api-key' 'openapi':202 'page':186 'paramet':212 'particular':165 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':41,55,152 'per':11,25,52,76 'per-request':51 'price':87,117,139,183 'prompt':193 'proper':229 'protocol':42,159 'provid':33,81,94 'quot':122 'rate':120,146 'render':188 'request':53,77 'request/response':205 'resourc':45 'respons':220 'return':169,227 'schema':203 'sentiment':110 'share':134 'span':105 'spars':180 'specif':44 'specul':239 'suit':99 'summar':112 'technic':197 'token':121 'unit':71 'usd':75 'usdc':14,28,54,73,161 'usdc-on-base' 'use':160 'util':127 'valid':129 'via':38,156 'wallet':192 'web3':116 'x402':2,16,40,61,102,158 'x402 balance check' 'x402-gated':1,15,101 'x402-payment'","prices":[{"id":"f26f050f-236c-4c25-9096-337d2214bf57","listingId":"75f6e47b-cc84-4212-bf77-e5a4b6aa8279","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/133/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":"2026-04-18T18:40:55.767Z"}],"sources":[{"listingId":"75f6e47b-cc84-4212-bf77-e5a4b6aa8279","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/133/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:55.767Z","lastSeenAt":"2026-04-29T03:33:52.513Z"}],"details":{"listingId":"75f6e47b-cc84-4212-bf77-e5a4b6aa8279","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. POST to the endpoint without payment to receive the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/133/balance\n# 2. Use an x402-compatible client to fulfill the payment challenge\n#    and re-submit with the X-PAYMENT header.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/133/balance"},{"claim":"The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers additional API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Demonstrating x402 protocol usage for micropayment-gated endpoints"],"bestFor":["Developers experimenting with x402 payment protocol integration","Agents needing on-demand account balance data without API key management","Low-volume, pay-as-you-go balance queries"],"notFor":["High-volume balance monitoring requiring bulk or subscription pricing","Use cases requiring detailed API documentation and guaranteed SLAs","Production systems needing well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.726Z"},"updatedAt":"2026-04-29T03:33:52.513Z"}}