{"id":"00153e48-fd29-44d0-9a0c-76740b27e440","shortId":"h2PZpy","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. It accepts POST requests and charges 0.02 USDC per call (maxAmountRequired of 20000 base units with 6 decimals = $0.02). Payment is settled in USDC (contract 0x8335…2913) on Base to the payee address 0x1A2B…85F3.\n\nThe provider's landing page advertises a broad suite of APIs across four categories: 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access.\n\nHowever, the specific endpoint probed here is `/api/v1/transactions/75`, which does not appear in the provider's listed catalog. Its purpose is unclear — it may be a transaction-related endpoint or a generic premium access gate. No OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/v1/transactions/75 does not appear in the provider's advertised API catalog — its actual functionality is unknown.","No documentation, OpenAPI spec, or example payloads are available.","All documentation pages (docs, pricing, API, README) return only a 'Connect wallet' prompt with no content.","The purpose and response format of this specific endpoint cannot be verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/75","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/transactions/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 challenge correctly) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint path (/api/v1/transactions/75) is not listed in the provider's catalog. The docs pages are empty beyond a wallet-connect 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'/request':13,28,135 '0.02':12,27,54,66,134 '0x1a2b':81 '0x8335':73 '20000':60 '2913':74 '6':64 '85f3':82 'Base network API' 'USDC micropayment endpoint' 'accept':49 'access':7,22,38,145,180 'across':94 'address':80 'advertis':88 'ai':104 'analysi':108 'analyt':98 'api':6,21,37,93,138,196 'appear':157 'base':9,24,46,61,76 'base-network' 'broad':90 'call':4,19,57 'catalog':163 'categori':96 'charg':53 'classif':111 'connect':202 'content':208 'contract':72 'convers':127 'crypto-paid API' 'data':97,101 'decim':65 'detail':188 'doc':193 'document':189 'embed':112 'endpoint':32,130,149,175 'estim':122 'exampl':186 'exchang':117 'export':102 'feed':116 'financ':113 'found':191 'four':95 'gas':121 'gate':181 'generat':128 'generic':178 'geocod':125 'howev':146 'infrastructur':124 'insight':103 'instant':144 'key':139 'land':86 'learn':106 'limit':142 'list':132,162 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':105 'maxamountrequir':58 'may':169 'metric':99 'network':47 'no-api-key' 'openapi':183 'page':87,197 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'paye':79 'payment':42,67 'per':3,18,56 'post':50 'post-method' 'premium':5,20,36,179 'premium API access' 'price':115,194 'probe':150 'prompt':204 'protocol':43 'provid':35,84,160 'purpos':165 'quot':120 'rate':118,141 'relat':174 'report':100 'request':51 'request/response':185 'return':199 'schema':184 'sentiment':107 'settl':69 'specif':148 'substant':207 'suit':91 'summar':110 'text':109 'token':119 'transact':173 'transaction-rel':172 'unclear':167 'unit':62 'usdc':15,30,55,71 'usdc-settlement' 'valid':126 'via':10,25,39 'wallet':203 'web3':114 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"fec04e23-68f8-476a-bba5-fb10aadcf354","listingId":"00153e48-fd29-44d0-9a0c-76740b27e440","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/transactions/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:03.394Z"}],"sources":[{"listingId":"00153e48-fd29-44d0-9a0c-76740b27e440","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:03.394Z","lastSeenAt":"2026-04-22T13:31:53.821Z"}],"details":{"listingId":"00153e48-fd29-44d0-9a0c-76740b27e440","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/75 \\\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 challenge requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/75"},{"claim":"The provider 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/transactions/75"}],"useCases":["Accessing premium API services without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints via x402 protocol"],"bestFor":["Developers wanting no-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume users who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.169Z"},"updatedAt":"2026-04-22T13:31:53.821Z"}}