{"id":"d0ec1b8d-abdb-4110-9c21-34c453825f4f","shortId":"zELBZr","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/74/balance` is described by the provider as \"Premium API Access\" and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum charge of 20,000 base units (i.e., $0.02 per request, since USDC uses 6 decimals).\n\nThe provider's landing page advertises a broader suite of endpoints 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 with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint being listed here is the account balance resource, and no documentation beyond the landing page was available (docs, API reference, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content).\n\nBecause there is no OpenAPI schema, no request/response examples, and no detailed documentation for this endpoint, the actual data returned by `/api/v1/accounts/74/balance` is unknown. The x402 challenge was successfully captured (HTTP 402 with a well-formed accepts array), confirming the endpoint is live and correctly advertising its payment terms.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","json-response","per-request-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No API documentation available — docs, API, pricing, and README pages all returned only 'Connect wallet' with no substantive content.","The specific data returned by /api/v1/accounts/74/balance is undocumented; request body format and response schema are unknown.","The endpoint path references a hardcoded account ID (74), suggesting it may be a demo or single-purpose resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/74/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/74/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and its pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt with no content. The purpose of this specific endpoint (account 74 balance) is unclear beyond its generic 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'0.02':10,24,81,129 '000':77 '0x8335':69 '20':76 '2913':70 '402':213 '6':87 'Base network API' 'USDC micropayment API' 'accept':219 'access':55 'account':4,18,35,152 'account balance API' 'account-balance' 'actual':199 'advertis':94,228 'ai/ml':103 'analysi':106 'analyt':102 'api':54,134,165 'array':220 'avail':163 'balanc':5,19,36,153 'base':8,22,64,78 'beyond':158 'broader':96 'captur':211 'challeng':208 'charg':74 'classif':108 'commit':142 'confirm':221 'connect':175 'content':181 'contract':68 'convers':124 'correct':227 'crypto payment endpoint' 'data':101,200 'decim':88 'describ':48 'detail':193 'doc':164 'document':157,194 'embed':109 'endpoint':6,20,30,99,146,197,223 'estim':118 'exampl':190 'exchang':113 'feed':112 'finance/web3':110 'form':218 'gas':117 'gate':3,17 'generat':125 'geocod':122 'howev':143 'http':212 'i.e':80 'infer':104 'infrastructur':120 'json':58 'json-response' 'key':135 'land':92,160 'limit':138 'list':148 'live':225 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':73 'minimum':141 'network':65 'no-api-key' 'openapi':186 'page':93,161,170 'pay':9,23 'pay-per-call API' 'payment':41,59,230 'per':11,25,82,130 'per-request-pricing' 'premium':53 'price':111,127,167 'prompt':177 'protocol':42 'provid':33,51,90 'quot':116 'rate':114,137 'readm':169 'refer':166 'request':12,26,83,131 'request/response':189 'resourc':45,154 'return':57,172,201 'schema':187 'sentiment':105 'settl':61 'sinc':84 'span':100 'specif':44,145 'substant':180 'success':210 'suit':97 'summar':107 'term':231 'token':115 'unit':79 'unknown':205 'usdc':14,28,67,85 'usdc-base' 'use':66,86 'util':121 'valid':123 'via':38 'wallet':176 'well':217 'well-form':216 'x402':2,16,40,207 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"45693f48-6c1a-454d-8cc6-f2e11d180dfc","listingId":"d0ec1b8d-abdb-4110-9c21-34c453825f4f","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/74/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":"2026-04-18T18:40:06.089Z"}],"sources":[{"listingId":"d0ec1b8d-abdb-4110-9c21-34c453825f4f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/74/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:06.089Z","lastSeenAt":"2026-04-29T05:05:58.218Z"}],"details":{"listingId":"d0ec1b8d-abdb-4110-9c21-34c453825f4f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/74/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 HTTP 402 with x402 version 1 challenge advertising USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/74/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/74/balance"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists additional endpoints for analytics, AI/ML, finance, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating x402-compatible agents that pay for API calls on Base","Accessing premium data without traditional API key provisioning"],"bestFor":["Agents or apps that already support x402 payment protocol","Users who want pay-per-use access without subscriptions or API keys","Developers experimenting with crypto-native micropayment APIs on Base"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.104Z"},"updatedAt":"2026-04-29T05:05:58.218Z"}}