{"id":"79f09d27-b1c0-4b3e-9299-e065d52dbe27","shortId":"w2gJXL","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/195` is labeled \"Premium API Access\" in the x402 challenge. The probe confirms it is live, returning a 402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted per-request upon payment.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns. The landing page lists many sibling endpoints but does not explain what data or functionality `/api/v1/payments/195` specifically provides. Prospective users should be aware that the actual behavior behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","premium-api-access"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; the actual response format is unknown","The specific functionality of /api/v1/payments/195 ('Premium API Access') is not described anywhere","Cannot verify what data or service this endpoint actually delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/195","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/payments/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/payments/195 is entirely undescribed. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':12,28,90,139 '0x8335':131 '20000':126 '2913':132 '300':150 '402':121 '402 payment endpoint' '6':135 'Base network API' 'USDC micropayment API' 'access':7,23,40,108,161 'actual':234 'advertis':160 'ai/ml':61 'analysi':64 'analyt':60 'api':6,22,39,57,107,154,175 'awar':231 'base':9,25,98,127,134 'behavior':235 'behind':236 'broad':50 'call':4,20 'catalog':51 'challeng':112,122 'classif':66 'confirm':115 'connect':184 'content':190 'convers':83 'crypto-paid API' 'data':59,221 'decim':136 'descript':202 'detail':201 'doc':174 'document':169 'embed':67 'endpoint':34,86,102,207,215,238 'equal':138 'estim':77 'exact':146 'exampl':198 'exchang':72 'explain':219 'extrem':171 'feed':71 'financ':68 'function':223 'gas':76 'generat':84 'geocod':81 'grant':163 'host':48 'infer':62 'infrastructur':79 'key':155 'label':105 'land':210 'limit':158 'list':212 'live':118 'lowpaymentfee' 'lowpaymentfee.com':36 'made':142 'mani':213 'maxamountrequir':124 'network':99 'no-api-key' 'openapi':194 'page':179,211 'particular':206 'pay':2,18,54 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':53 'payment':44,140,168 'per':3,13,19,29,55,91,165 'per-request':164 'premium':5,21,38,106 'premium-api-access' 'price':70,88,176 'probe':114 'prompt':186 'prospect':227 'protocol':45 'provid':37,226 'quot':75 'rate':73,157 'readm':178 'render':181 'request':14,30,56,92,166 'request/response':197 'return':119,208 'schema':195 'scheme':147 'second':151 'sentiment':63 'settl':93 'sibl':214 'site':47 'span':58 'spars':172 'specif':101,225 'summar':65 'timeout':152 'token':74 'undocu':240 'unit':128 'upon':167 'usdc':16,32,95,130 'usdc-base' 'user':228 'util':80 'valid':82 'via':10,26,41,143 'wallet':185 'web3':69 'x402':11,27,43,111,145 'x402 API' 'x402-payment'","prices":[{"id":"0501d6a3-c828-413a-960c-17da18dbcf3a","listingId":"79f09d27-b1c0-4b3e-9299-e065d52dbe27","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/payments/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:52.295Z"}],"sources":[{"listingId":"79f09d27-b1c0-4b3e-9299-e065d52dbe27","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/195","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:52.295Z","lastSeenAt":"2026-04-23T16:07:16.551Z"}],"details":{"listingId":"79f09d27-b1c0-4b3e-9299-e065d52dbe27","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/195 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/195"},{"claim":"Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API functionality without API key management","Agent-driven pay-per-request workflows settled in USDC on Base","Integrating low-friction micropayment-gated endpoints into automated pipelines"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.718Z"},"updatedAt":"2026-04-23T16:07:16.551Z"}}