{"id":"5a88585c-811f-4086-a99e-9edc82b4bd45","shortId":"kc5uyD","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 a \"Premium API Access\" account balance query via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/60/balance` accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet, with a 300-second timeout window. No API keys or rate limits are advertised; access is purely payment-gated.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no explanation of what \"accounts/60/balance\" actually returns or what parameters it accepts. The platform appears to be a demonstration or early-stage deployment of x402-powered APIs. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The meaning of 'accounts/60/balance' (what account 60 is, what balance is returned) is completely undocumented","Platform appears to be early-stage or a demo; reliability and longevity are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/60/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/60/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 402 challenge, confirming it works. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing endpoints. The specific purpose of 'accounts/60/balance' is unexplained. This is effectively a stub 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'0.02':10,24,76,124 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '20':119 '300':142 '402':227 '6':128 'Base network API' 'USDC micropayment API' 'accept':90,201 'access':37,154 'account':4,18,38 'account balance API' 'account-balance' 'accounts/60/balance':194 'actual':195 'address':135 'advertis':153 'ai/ml':66 'analyt':65 'api':36,61,147,168,218 'appear':204 'attach':105 'balanc':5,19,39 'base':8,22,84,121,138 'base-network' 'broader':51 'call':60 'caller':104 'challeng':228 'confirm':222 'connect':174 'contain':111 'content':180 'crypto payment API' 'data':64,69 'decim':129 'demonstr':208 'deploy':213 'difficult':236 'doc':165 'document':160,233 'dozen':55 'earli':211 'early-stag':210 'endpoint':6,20,30,62,88,220 'exampl':188 'experiment':240 'explan':191 'extrem':162 'finance/web3':68 'gate':3,17,159 'handl':98 'header':110 'i.e':123 'infer':67 'infrastructur':71 'inlin':99 'json':95 'json-response' 'key':148 'lack':231 'limit':151 'live':223 'lowpaymentfee' 'lowpaymentfee.com':32 'mainnet':139 'make':234 'network':85 'no-api-key' 'offer':54 'openapi':184 'page':169 'paramet':199 'part':48 'pay':9,23,58 'pay-per-cal':57 'pay-per-call API' 'pay-per-request' 'payment':44,96,109,115,131,158 'payment-g':157 'per':11,25,59,77 'platform':52,203 'post':91 'power':217 'premium':35 'price':74,166 'prompt':176 'protocol':45,103 'provid':33 'pure':156 'queri':40 'rate':150 'render':171 'request':12,26,78,92 'request/response':187 'return':94,196,224 'schema':185 'second':143 'sent':133 'settl':79 'sign':113 'sinc':125 'span':63 'spars':163 'specif':87 'stage':212 'timeout':144 'unit':122 'usdc':14,28,81,114,126 'usdc-settlement' 'use':127,238 'util':72 'valid':226 'via':41,100 'wallet':175 'window':145 'without':239 'x':108 'x-payment':107 'x402':2,16,43,102,216 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-powered':215","prices":[{"id":"e6439420-43c0-4f1e-9174-903cbb224942","listingId":"5a88585c-811f-4086-a99e-9edc82b4bd45","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/60/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":"2026-04-18T18:39:54.060Z"}],"sources":[{"listingId":"5a88585c-811f-4086-a99e-9edc82b4bd45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/60/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:54.060Z","lastSeenAt":"2026-04-28T05:33:51.146Z"}],"details":{"listingId":"5a88585c-811f-4086-a99e-9edc82b4bd45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/60/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/60/balance"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/60/balance"},{"claim":"Docs, pricing, and API pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating x402 payment-gated endpoints into agent workflows","Testing x402 protocol implementations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC transactions on Base","Low-cost per-request API access without API key management"],"notFor":["Production use requiring documented request/response schemas","Users who need fiat payment options or cannot transact on Base","High-throughput batch queries where per-call payment overhead is impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.641Z"},"updatedAt":"2026-04-28T05:33:51.146Z"}}