{"id":"f2436b6c-7f87-47f2-8a8c-91137b86635f","shortId":"PemqRX","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. 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/317` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys are required; payment is handled entirely through the X-PAYMENT header. The site advertises no rate limits and instant access.\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 description of what this particular endpoint (`/payments/317`) actually returns or what input it expects beyond a POST body. The site's landing page lists many API paths but does not clarify whether `/api/v1/payments/317` maps to one of the listed services or is a distinct resource. Prospective users should be prepared to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","402 payment required"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The purpose of /api/v1/payments/317 is unclear — it does not obviously map to any of the listed API categories on the landing page","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/317","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/317","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 challenge, but documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/payments/317 specifically does. The listing is effectively a stub with confirmed liveness and 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'/api/v1/payments/317':101,230 '/docs':171 '/payments/317':204 '/pricing':173 '/readme':175 '/request':13,28 '0.02':12,27,88,127 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '20':121 '402 payment required' '6':132 'accept':108 'access':7,22,38,106,165 'actual':205 'address':138 'advertis':159 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,143,223 'base':9,24,96,123,141 'base network api' 'beyond':212 'bodi':215 'broad':48 'call':4,19,135 'catalog':49 'challeng':113 'clarifi':228 'classif':64 'confirm':114 'connect':181 'contact':251 'content':187 'convers':81 'data':57 'decim':133 'descript':198 'detail':255 'distinct':241 'document':166 'embed':65 'endpoint':32,84,100,203 'entir':150 'estim':75 'exampl':195 'exchang':70 'expect':211 'experi':249 'extrem':168 'feed':69 'financ':66 'gas':74 'generat':82 'geocod':79 'handl':149 'header':156 'host':46 'infer':60 'infrastructur':77 'input':209 'instant':164 'json-response' 'key':144 'label':103 'land':219 'limit':162 'list':221,236 'live':117 'low payment fee' 'lowpaymentfee.com':34 'mani':222 'map':231 'micropayment api' 'network':97 'no-api-key' 'one':233 'openapi':191 'page':176,220 'paid':136 'particular':202 'path':224 'pay':2,17,52 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payment':42,147,155 'per':3,18,53,89,134 'post':109,214 'post-endpoint' 'premium':5,20,36,104 'prepar':247 'price':68,86 'prompt':183 'prospect':243 'protocol':43 'provid':35,253 'quot':73 'rate':71,161 'render':178 'request':54,90,110,118 'request/response':194 'requir':146 'resourc':242 'return':206 'schema':192 'sentiment':61 'servic':237 'settl':91 'sinc':129 'site':45,158,217 'span':56 'spars':169 'specif':99 'summar':63 'token':72 'unit':124 'usd':128 'usdc':15,30,93,126,130 'usdc api access' 'usdc-base' 'use':131 'user':244 'util':78 'valid':80 'via':10,25,39 'wallet':182 'web3':67 'whether':229 'x':154 'x-payment':153 'x402':11,26,41,112 'x402 api' 'x402-payment'","prices":[{"id":"091cfcc9-1723-43ef-be5f-efca24c841f2","listingId":"f2436b6c-7f87-47f2-8a8c-91137b86635f","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/317","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:18.058Z"}],"sources":[{"listingId":"f2436b6c-7f87-47f2-8a8c-91137b86635f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/317","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:18.058Z","lastSeenAt":"2026-04-23T12:31:28.258Z"}],"details":{"listingId":"f2436b6c-7f87-47f2-8a8c-91137b86635f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/317 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live status with maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/317"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/317"},{"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 services without subscription or API key management","Agent-driven workflows that need on-demand, pay-as-you-go API calls settled in USDC on Base","Integrating low-cost per-request API access into Web3 applications"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing cheap micro-transactions for API calls ($0.02 each)"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk access with predictable monthly billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.507Z"},"updatedAt":"2026-04-23T12:31:28.258Z"}}