{"id":"17f80a9a-3790-42bd-9515-6964e4900674","shortId":"avweuX","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/41/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 site-wide $0.02/request pricing advertised across all endpoints.\n\nThe provider lowpaymentfee.com hosts a broader suite of 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 per-request pricing model with no API keys, no rate limits, and no minimum commitments. Payment is settled in USDC on the Base L2 network via the x402 exact-payment scheme.\n\nThe specific endpoint probed here (`/api/v1/accounts/41/balance`) is described only as \"Premium API Access\" with no further documentation on request parameters or response format. The docs, pricing, API, and README pages on the site all render only a \"Connect wallet\" prompt with no additional content, so the actual behavior and output schema of this endpoint remain unclear.","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"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No request or response schema provided; actual endpoint behavior is unknown","The specific endpoint path (/api/v1/accounts/41/balance) with a hardcoded account ID '41' is unusual and unexplained","Cannot verify what data this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/41/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/41/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 (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation on request parameters, response schema, or what 'account balance' actually returns. The docs pages are empty beyond a wallet connect prompt, making this effectively a stub 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'/request':85 '0.02':74,84,132 '000':69 '20':68 'Base network API' 'USDC micropayment API' 'access':178 'account':4,18,35 'account balance API' 'account-balance' 'across':88 'actual':212 'addit':208 'advertis':87 'ai/ml':103 'analysi':106 'analyt':102 'api':99,140,177,192 'balanc':5,19,36 'base':8,22,58,70,156 'base-network' 'behavior':213 'behind':49 'broader':96 'call':12,26 'challeng':62 'classif':108 'commit':148 'connect':203 'consist':78 'content':209 'convers':125 'cost':66 'data':101 'describ':173 'doc':190 'document':182 'embed':109 'endpoint':6,20,30,90,128,168,219 'estim':119 'exact':163 'exact-pay':162 'exchang':114 'feed':113 'financ':110 'format':188 'gas':118 'gate':3,17,48 'generat':126 'geocod':123 'host':94 'indic':63 'infer':104 'infrastructur':121 'key':141 'l2':157 'limit':144 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,93 'maximum':65 'minimum':147 'model':137 'network':59,158 'no-api-key' 'output':215 'page':195 'paramet':185 'pay':10,24 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request' 'payment':41,55,149,164 'per':11,25,52,76,134 'per-request':51,133 'premium':176 'price':86,112,136,191 'probe':169 'prompt':205 'protocol':42 'provid':33,92 'quot':117 'rate':115,143 'readm':194 'remain':220 'render':200 'request':53,77,135,184 'resourc':45 'respons':187 'schema':216 'scheme':165 'sentiment':105 'settl':151 'share':129 'site':82,198 'site-wid':81 'span':100 'specif':44,167 'suit':97 'summar':107 'token':116 'unclear':221 'unit':71 'usd':75 'usdc':14,28,54,73,153 'usdc-settlement' 'util':122 'valid':124 'via':38,159 'wallet':204 'web3':111 'wide':83 'x402':2,16,40,61,161 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e257d40a-c55d-402d-a65f-4489b4fd88b4","listingId":"17f80a9a-3790-42bd-9515-6964e4900674","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/41/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":"2026-04-18T18:39:38.968Z"}],"sources":[{"listingId":"17f80a9a-3790-42bd-9515-6964e4900674","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/41/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:38.968Z","lastSeenAt":"2026-04-28T08:04:42.842Z"}],"details":{"listingId":"17f80a9a-3790-42bd-9515-6964e4900674","quickStartSnippet":"# 1. Send a POST to get the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/41/balance\n# Response: 402 with x402 payment challenge\n# 2. Construct X-PAYMENT header with USDC payment proof on Base\n# 3. Resend request with the header to receive the balance data","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 (0.02 USD) per request on the Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/41/balance"},{"claim":"The site advertises $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/41/balance"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing on-demand account balance data without API key management","Low-volume, pay-as-you-go API consumption"],"notFor":["High-volume balance queries where per-request fees add up","Use cases requiring detailed API documentation or guaranteed SLAs","Users who need non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.348Z"},"updatedAt":"2026-04-28T08:04:42.842Z"}}