{"id":"a812b064-1159-41f3-aab4-4ea12814f110","shortId":"e7W3Xf","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/125/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 x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & ML (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 on the Base network.\n\nThe specific endpoint probed (`/api/v1/accounts/125/balance`) appears to return account balance information, though the exact response schema is undocumented. The crawled docs, pricing, and README pages were effectively empty (showing only a \"Connect wallet\" prompt), so detailed request/response schemas and usage examples are unavailable. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available; docs/pricing/README pages show only 'Connect wallet' prompt","Response schema for /api/v1/accounts/125/balance is completely undocumented","The endpoint path includes a hardcoded account ID (125), suggesting it may be a demo or single-account resource","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/125/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/125/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially absent — the docs, pricing, and README pages all render only a wallet-connect prompt. No request/response schema, no usage examples, and the specific purpose of the /accounts/125/balance path is only inferrable from its URL. This is effectively a stub 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'0.02':71,154 '000':76 '0x8335':64 '20':75 '2913':65 '402':212 '6':80 'Base network API' 'USDC micropayment API' 'accept':48 'access':37 'account':4,18,169 'account balance API' 'account-balance' 'advertis':108 'ai':124 'analysi':127 'analyt':118 'api':36,83,115 'appear':166 'attach':92 'balanc':5,19,170 'base':8,22,59,77,159 'base-network' 'behind':42 'broader':105 'call':12,26 'caller':90 'challeng':213 'classif':130 'confirm':207 'connect':192 'contract':63 'convers':147 'cost':69 'crawl':180 'crypto payment API' 'data':117,121 'decim':81 'detail':196 'doc':181 'effect':187 'embed':131 'empti':188 'endpoint':6,20,30,150,163,205 'estim':141 'exact':174 'exampl':201 'exchang':136 'export':122 'feed':135 'financ':132 'gas':140 'gate':3,17,41,114 'generat':148 'geocod':145 'header':97 'inform':171 'infrastructur':143 'insight':123 'json':53 'json-response' 'key':84 'limit':87 'list':152 'live':208 'lowpaymentfee' 'lowpaymentfee.com':32,106 'maximum':68 'metric':119 'ml':125 'network':60,160 'no-api-key' 'page':185 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':45,54,96,102 'per':11,25,73,155 'platform':107 'post':49 'premium':35 'price':134,182 'probe':164 'prompt':194 'proof':103 'protocol':46 'provid':33 'quot':139 'rate':86,137 'readm':184 'report':120 'request':50,74,156 'request/response':197 'requir':89 'resourc':38 'respons':175 'return':52,168 'schema':176,198 'sentiment':126 'settl':56 'show':189 'simpli':91 'span':116 'specif':162 'suit':110 'summar':129 'text':128 'though':172 'token':138 'unavail':203 'undocu':178 'unit':78 'usag':200 'usdc':14,28,62,72 'usdc-settlement' 'use':61 'util':144 'valid':100,146,211 'via':209 'wallet':193 'web3':133 'x':95 'x-payment':94 'x402':2,16,44,101,113 'x402 API' 'x402-gated':1,15,112 'x402-payment'","prices":[{"id":"3773dc0b-823c-4142-97e5-dec2a535bbd0","listingId":"a812b064-1159-41f3-aab4-4ea12814f110","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/125/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":"2026-04-18T18:40:50.999Z"}],"sources":[{"listingId":"a812b064-1159-41f3-aab4-4ea12814f110","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/125/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:50.999Z","lastSeenAt":"2026-04-27T22:03:22.908Z"}],"details":{"listingId":"a812b064-1159-41f3-aab4-4ea12814f110","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/125/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 advertising USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/accounts/125/balance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/125/balance"},{"claim":"Platform advertises $0.02/request pricing 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 data with per-call USDC micropayments","Integrating x402-gated balance checks into agent workflows","Accessing financial account information without API key management"],"bestFor":["Agents or services that can settle x402 payments on Base","Use cases needing pay-per-call access without subscription commitments","Developers experimenting with x402 protocol integrations"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-call pricing may be inefficient compared to bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.911Z"},"updatedAt":"2026-04-27T22:03:22.908Z"}}