{"id":"d8ef207b-b6d2-4b46-b2d8-384f7c67acad","shortId":"XS65FA","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 a \"Premium API Access\" account balance lookup via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/46/balance` accepts POST requests and returns JSON. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model 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 exact semantics of \"account 46 balance\" are unclear: it is not documented whether this returns a crypto wallet balance, a platform account balance, or something else entirely. The endpoint is confirmed live (402 challenge returned successfully), but without documentation the actual utility is difficult to assess.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","account-balance","json-api","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","balance lookup","crypto payment gated API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The meaning of 'accounts/46/balance' is undocumented — unclear what data is returned","The platform lists many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/46/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/46/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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'accounts/46/balance' actually returns. Pricing is clear ($0.02/request) but the endpoint's actual utility cannot be 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'/api/v1/accounts/46/balance':89 '/docs':155 '/pricing':156 '/readme':159 '/request':132 '0.02':116,131 '000':105 '0x8335':110 '20':104 '2913':111 '402':219 '46':191 '6':121 'Base network API' 'USDC pay-per-call' 'accept':90 'access':37 'account':4,18,38,190,208 'account balance API' 'account-balance' 'across':135 'actual':227 'advertis':58 'ai':66 'analyt':65 'api':36,62,140 'assess':232 'avail':185 'balanc':5,19,39,192,205,209 'balance lookup' 'base':8,22,84,106,113 'behind':76 'call':12,26 'challeng':98,220 'commit':148 'confirm':128,217 'connect':165 'content':171 'cost':102 'crypto':203 'crypto payment gated API' 'data':64 'decim':122 'difficult':230 'document':150,180,198,225 'els':212 'endpoint':6,20,30,51,88,137,215 'entir':213 'equal':115 'exact':187 'exampl':184 'extrem':152 'financ':69 'flat':130 'gate':3,17,75 'indic':99 'infrastructur':72 'json':95 'json-api' 'key':141 'land':126 'learn':68 'limit':144 'live':218 'lookup':40 'lowpaymentfee' 'lowpaymentfee.com':32,55 'machin':67 'mani':50 'maximum':101 'micropay':78 'minimum':147 'model':134 'network':85 'no-api-key' 'offer':52 'one':48 'openapi':175 'page':127,160 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'payment':44 'per':11,25,117 'platform':56,124,207 'post':91 'premium':35 'price':133 'prompt':167 'protocol':45 'provid':33 'rate':143 'render':162 'request':92,118 'request/response':178 'requir':149 'return':94,201,221 'schema':179 'semant':188 'settl':79 'someth':211 'span':63 'spars':153 'spec':176 'specif':87 'success':222 'suit':60 'unclear':194 'unit':107 'usag':183 'usdc':14,28,81,109,119 'usdc-base' 'use':120 'util':73,228 'via':41 'wallet':166,204 'web3':70 'whether':199 'without':224 'x402':2,16,43,77,97 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"788a6f92-6c86-4e5d-adfb-2c5e2f78ede7","listingId":"d8ef207b-b6d2-4b46-b2d8-384f7c67acad","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/46/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":"2026-04-18T18:39:42.587Z"}],"sources":[{"listingId":"d8ef207b-b6d2-4b46-b2d8-384f7c67acad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/46/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:42.587Z","lastSeenAt":"2026-04-28T06:33:39.527Z"}],"details":{"listingId":"d8ef207b-b6d2-4b46-b2d8-384f7c67acad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/46/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/46/balance"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/46/balance"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information via a single paid API call","Integrating pay-per-use balance checks into agent workflows","Demonstrating x402 protocol micropayment flows"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing no-auth, pay-per-call balance lookups","Projects that want to avoid API key management"],"notFor":["Production use cases requiring documented request/response schemas","Users who need free or subscription-based API access","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.182Z"},"updatedAt":"2026-04-28T06:33:39.527Z"}}