{"id":"c2e3b2e5-d059-480a-9c02-a79e2385609c","shortId":"C9A6Az","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\" resource at `/api/v1/accounts/65/balance`, gated behind the x402 payment protocol. It accepts POST requests and returns JSON. 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). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call 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 priced at $0.02 per request on the Base network. However, the specific endpoint being listed here (`/api/v1/accounts/65/balance`) appears to be an account balance lookup, and its exact response schema is not documented. The crawled docs, pricing, and README pages returned only a \"Connect wallet\" prompt with no further technical detail.\n\nBecause there is no OpenAPI spec, no response schema, and no usage examples available, the precise fields returned by this endpoint remain unknown. Callers should expect a JSON response containing balance information for account ID 65, but the structure must be discovered empirically.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or response schema available — response structure is unknown","Documentation pages (/docs, /pricing, /README) all returned only 'Connect wallet' with no content","The endpoint path references a specific account ID (65); it is unclear whether this is parameterized or fixed","No examples or usage guides found anywhere on the site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/65/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/65/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema, no request body schema, and no documentation beyond a landing page listing. The specific purpose of account 65's balance endpoint is unexplained. This is effectively a stub 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'0.02':71,146 '000':76 '0x8335':64 '20':75 '2913':65 '6':80 '65':229 'Base network API' 'USDC micropayment API' 'accept':48 'access':37 'account':4,18,165,227 'account balance API' 'account-balance' 'advertis':108 'ai/ml':120 'analysi':123 'analyt':119 'api':36,83,116 'appear':161 'attach':92 'avail':207 'balanc':5,19,166,224 'base':8,22,59,77,151 'base-network' 'behind':42 'broader':105 'call':12,26,115 'caller':90,217 'classif':125 'connect':186 'contain':223 'contract':63 'convers':141 'cost':69 'crawl':177 'crypto payment API' 'data':118 'decim':81 'detail':193 'discov':235 'doc':178 'document':175 'embed':126 'empir':236 'endpoint':6,20,30,156,214 'estim':135 'exact':170 'exampl':206 'exchang':130 'expect':219 'feed':129 'field':210 'finance/web3':127 'gas':134 'gate':3,17,41 'generat':142 'geocod':139 'header':97 'howev':153 'id':228 'infer':121 'inform':225 'infrastructur':137 'json':53,221 'json-response' 'key':84 'limit':87 'list':158 'lookup':167 'lowpaymentfee' 'lowpaymentfee.com':32,106 'maximum':68 'must':233 'network':60,152 'no-api-key' 'openapi':198 'page':182 'pay':10,24,113 'pay-per-cal':9,23,112 'pay-per-call' 'pay-per-request API' 'payment':45,54,96,102 'per':11,25,73,114,147 'platform':107 'post':49 'precis':209 'premium':35 'price':128,144,179 'prompt':188 'proof':103 'protocol':46 'provid':33 'quot':133 'rate':86,131 'readm':181 'remain':215 'request':50,74,148 'requir':89 'resourc':38 'respons':171,201,222 'return':52,183,211 'schema':172,202 'sentiment':122 'settl':56 'simpli':91 'span':117 'spec':199 'specif':155 'structur':232 'suit':110 'summar':124 'technic':192 'token':132 'unit':78 'unknown':216 'usag':205 'usdc':14,28,62,72 'usdc-settlement' 'use':61 'util':138 'valid':100,140 'wallet':187 'x':95 'x-payment':94 'x402':2,16,44,101 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3d812289-6da4-4604-ae01-fb77d6ffc044","listingId":"c2e3b2e5-d059-480a-9c02-a79e2385609c","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/65/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":"2026-04-18T18:39:58.873Z"}],"sources":[{"listingId":"c2e3b2e5-d059-480a-9c02-a79e2385609c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/65/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:58.873Z","lastSeenAt":"2026-04-29T05:33:53.829Z"}],"details":{"listingId":"c2e3b2e5-d059-480a-9c02-a79e2385609c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/65/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/65/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (0.02 USD at 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/accounts/65/balance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/65/balance"}],"useCases":["Querying account balance data without needing API key registration","Agent-driven balance lookups settled instantly via USDC on Base","Integrating pay-per-call balance checks into automated workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schemas before integration","High-volume batch queries where per-call pricing may add up","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.452Z"},"updatedAt":"2026-04-29T05:33:53.829Z"}}