{"id":"048b2c9a-739a-4b5c-811c-3bc9a527505b","shortId":"4eqB9C","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/135/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 required — payment is handled entirely via the x402 protocol using USDC on Base.\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 schema, no request/response examples, and no description of what the balance endpoint actually returns or what input parameters it expects. The endpoint is confirmed live (returns a valid x402 challenge), but the lack of documentation makes it difficult to assess the actual utility or data quality of the response.","tags":[],"capabilities":["x402-payment","usdc-on-base","account-balance","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The endpoint path '/api/v1/accounts/135/balance' references a hardcoded account ID (135); unclear if this is a demo or a real resource","Cannot verify what data the endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/135/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/135/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The purpose of the specific '/accounts/135/balance' endpoint is unclear — it could be a demo or placeholder. This is effectively a stub 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'/request':86,138 '0.02':74,85,137 '000':69 '20':68 'Base network API' 'USDC micropayment API' 'account':4,18,35 'account balance API' 'account-balance' 'across':88 'actual':204,233 'advertis':83 'ai/ml':108 'analysi':111 'analyt':107 'api':91,104,143,171 'assess':231 'balanc':5,19,36,202 'base':8,22,58,70,164 'behind':49 'broader':98 'call':12,26 'challeng':62,221 'classif':113 'commit':151 'confirm':215 'connect':180 'consist':78 'convers':130 'cost':66 'data':106,236 'descript':198 'detail':187 'difficult':229 'doc':170 'document':165,226 'embed':114 'endpoint':6,20,30,92,133,203,213 'entir':156 'estim':124 'exampl':195 'exchang':119 'expect':211 'extrem':167 'feed':118 'financ':115 'flat':84 'gas':123 'gate':3,17,48,103 'generat':131 'geocod':128 'handl':155 'host':96 'indic':63 'infer':109 'infrastructur':126 'input':208 'key':144 'lack':224 'limit':147 'live':216 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,95 'make':227 'maximum':65 'minimum':150 'model':140 'network':59 'no-api-key' 'openapi':191 'page':175 'paramet':209 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':41,55,153 'per':11,25,52,76 'per-request':51 'price':87,117,139,172 'prompt':182 'protocol':42,160 'provid':33,81,94 'qualiti':237 'quot':122 'rate':120,146 'readm':174 'render':177 'request':53,77 'request/response':194 'requir':152 'resourc':45 'respons':240 'return':205,217 'schema':192 'sentiment':110 'share':134 'span':105 'spars':168 'specif':44 'suit':99 'summar':112 'technic':186 'token':121 'unit':71 'usd':75 'usdc':14,28,54,73,162 'usdc-on-base' 'use':161 'util':127,234 'valid':129,219 'via':38,157 'wallet':181 'web3':116 'x402':2,16,40,61,102,159,220 'x402 API' 'x402-gated':1,15,101 'x402-payment'","prices":[{"id":"db9fe028-b8d4-42f3-8d61-7ccf04598f80","listingId":"048b2c9a-739a-4b5c-811c-3bc9a527505b","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/135/balance","description":"Premium API 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application/json\"","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 (USD Coin) on Base network, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/accounts/135/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 APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing no-auth, pay-per-call API access","Low-volume balance queries without subscription commitments"],"notFor":["Production use cases requiring documented request/response schemas","High-volume balance queries where per-call pricing adds up","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.461Z"},"updatedAt":"2026-04-27T20:34:31.828Z"}}