{"id":"8ef7888f-f5f7-4ee1-86a3-3c0f23612ba1","shortId":"h3PfKc","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 (account ID 70) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all settled on the Base network using USDC via the x402 protocol.\n\nThe specific endpoint `/api/v1/accounts/70/balance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the POST expects or what shape the balance response takes. The platform appears to be a demonstration or early-stage deployment of x402-based API monetization.","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 API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request body or response format","Purpose of 'account 70 balance' is undocumented — unclear what data is returned","Platform appears to be early-stage or a demo; reliability and longevity are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/70/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/70/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, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty stubs. The purpose of this specific endpoint (account 70 balance) is unclear beyond its URL path. Effectively a stub 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'/api/v1/accounts/70/balance':87 '/docs':150 '/pricing':151 '/readme':154 '/request':128 '0.02':113,127 '000':103 '0x8335':108 '20':102 '402':189 '6':118 '70':40 'Base network API' 'USDC micropayment API' 'accept':88 'account':4,18,35,38 'account balance API' 'account-balance' 'across':130 'advertis':97 'ai/ml':65 'analyt':64 'api':61,135,226 'appear':212 'avail':180 'balanc':5,19,36,207 'base':8,22,76,104,110,225 'base-network' 'behind':41 'bodi':199 'broader':50 'call':12,26 'challeng':96,190 'commit':143 'confirm':125,184 'connect':160 'content':166 'cost':100 'crypto payment API' 'data':63,68 'decim':119 'demonstr':216 'deploy':221 'document':145,175,193 'earli':219 'early-stag':218 'endpoint':6,20,30,86,132,182 'equal':112 'exampl':179 'expect':202 'extrem':147 'finance/web3':67 'gate':3,17 'id':39 'infer':66 'json':93 'json-response' 'key':136 'land':123 'limit':139 'live':185 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':99 'minimum':142 'monet':227 'network':77 'no-api-key' 'offer':53 'openapi':170 'page':124,155 'part':47 'pay':10,24,58 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':57 'paywal':44 'per':11,25,59,114 'platform':51,121,211 'post':89,201 'price':129 'prompt':162 'proper':188 'protocol':83 'provid':33 'rate':138 'render':157 'request':60,90,115,198 'request/response':173 'requir':144 'respons':208 'return':92,186 'schema':174 'servic':71 'settl':73 'shape':205 'span':62 'spars':148 'spec':171 'specif':85 'stage':220 'take':209 'unclear':196 'uniform':126 'unit':105 'usag':178 'usdc':14,28,79,107,116 'usdc-settlement' 'use':78,117 'util':70 'varieti':55 'via':80 'wallet':161 'without':192 'x402':2,16,43,82,95,224 'x402 API' 'x402-based':223 'x402-gated':1,15 'x402-payment'","prices":[{"id":"0ed98922-1365-4a98-8f1e-9bee743083ec","listingId":"8ef7888f-f5f7-4ee1-86a3-3c0f23612ba1","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/70/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":"2026-04-18T18:40:02.520Z"}],"sources":[{"listingId":"8ef7888f-f5f7-4ee1-86a3-3c0f23612ba1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/70/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:02.520Z","lastSeenAt":"2026-04-28T05:33:51.559Z"}],"details":{"listingId":"8ef7888f-f5f7-4ee1-86a3-3c0f23612ba1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/70/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02/request pricing, no API keys, no rate limits, Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/70/balance"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/70/balance"}],"useCases":["Querying account balance data via a single paid API call","Demonstrating x402 protocol payment flows on Base","Integrating pay-per-request balance lookups into agent workflows"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents needing simple pay-per-call balance queries without API key management","Testing USDC micropayment flows on Base"],"notFor":["Production use requiring documented request/response schemas","High-volume balance queries where per-call pricing is inefficient","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.259Z"},"updatedAt":"2026-04-28T05:33:51.559Z"}}