{"id":"419f1532-72d2-4233-8157-8bc3be83d530","shortId":"PVqcLw","kind":"x402","title":"x402-gated account balance endpoint on Base, paid per-call in USDC.","tagline":"x402-gated account balance endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/44/balance` is described as \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\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 spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation it is unclear what request body the balance endpoint expects or what shape the response takes.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","per-call-pricing","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or JSON schema provided for request or response bodies.","The specific endpoint /api/v1/accounts/44/balance has a hardcoded account ID (44); unclear if this is parameterizable.","The broader platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/44/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/44/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /accounts/44/balance resource is 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'/api/v1/accounts/44/balance':46 '/docs':155 '/pricing':157 '/readme':159 '0.02':74,136 '000':79 '0x8335':67 '20':78 '2913':68 '402':196 '6':83 'Base network API' 'USDC micropayment API' 'accept':54 'access':52 'account':4,18,35 'account balance API' 'account-balance' 'advertis':89 'ai':105 'analysi':109 'analyt':99 'api':51,96,141 'avail':186 'balanc':5,19,36,208 'base':8,22,62,80 'base-network' 'bodi':206 'broader':86 'call':12,26 'challeng':197 'classif':112 'commit':149 'confirm':190 'connect':165 'contract':66 'convers':129 'cost':72 'crypto payment endpoint' 'data':98,102 'decim':84 'describ':48 'detail':172 'document':150,181,200 'embed':113 'endpoint':6,20,30,132,188,209 'estim':123 'exampl':184 'exchang':118 'expect':210 'export':103 'extrem':152 'feed':117 'financ':114 'gas':122 'gate':3,17,95 'generat':130 'geocod':127 'infrastructur':125 'insight':104 'key':142 'learn':107 'limit':145 'list':134 'live':191 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,87 'machin':106 'maximum':71 'metric':100 'minimum':148 'network':63 'no-api-key' 'openapi':176 'page':160 'paid':9,23 'pay-per-call API' 'payload':185 'payment':41,57 'per':11,25,76,137 'per-cal':10,24 'per-call-pricing' 'platform':88 'post':55 'post-method' 'premium':50 'price':116 'prompt':167 'protocol':42 'provid':33 'quot':121 'rate':119,144 'render':162 'report':101 'request':56,77,138,205 'request/response':179 'resourc':45 'respons':215 'return':192 'schema':180 'sentiment':108 'settl':59 'shape':213 'span':97 'spars':153 'spec':177 'specif':44 'suit':91 'summar':111 'take':216 'technic':171 'text':110 'token':120 'unclear':203 'unit':81 'usdc':14,28,65,75 'usdc-settlement' 'use':64 'util':126 'valid':128,194 'via':38 'wallet':166 'web3':115 'without':199 'x402':2,16,40,94,195 'x402 API' 'x402-gated':1,15,93 'x402-payment'","prices":[{"id":"41d1526a-2285-4122-9fb1-0cec21d95621","listingId":"419f1532-72d2-4233-8157-8bc3be83d530","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/44/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":"2026-04-18T18:39:41.925Z"}],"sources":[{"listingId":"419f1532-72d2-4233-8157-8bc3be83d530","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/44/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:41.925Z","lastSeenAt":"2026-04-30T08:34:14.133Z"}],"details":{"listingId":"419f1532-72d2-4233-8157-8bc3be83d530","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/44/balance\n# Returns 402 with x402 challenge JSON. Use an x402-compatible client\n# (e.g. @AgentzPay/x402-axios) to automatically settle the USDC payment.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/44/balance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/44/balance"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information via a pay-per-call model","Integrating x402 payment-gated endpoints into agent workflows","Accessing premium data without API key registration"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-request API access on Base","Low-volume or sporadic queries where $0.02/call is acceptable"],"notFor":["High-volume production workloads needing documented, stable schemas","Users who need detailed API documentation or client libraries before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.238Z"},"updatedAt":"2026-04-30T08:34:14.133Z"}}