{"id":"13b3f57b-7cb8-4ab3-986f-1db6f14e1444","shortId":"LRTbj2","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 `/api/v1/item/47` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network. The listed price is $0.02 per request (20,000 base units of USDC with 6 decimals), with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/item/47` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that generic title. The site lists numerous other endpoints (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), all at the same $0.02 price point. Without additional documentation or an OpenAPI spec, the precise input/output schema for this particular item endpoint is unknown.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) when called via POST. Payment is accepted in USDC (contract `0x8335...2913`) on Base mainnet, with a 300-second timeout. The site's docs, pricing, and API pages appear to be behind a wallet-connect gate, so no further technical documentation was retrievable from the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API access","Base network API"],"warnings":["The exact functionality of /api/v1/item/47 is unknown — 'Premium API Access' is a generic label with no further documentation.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec or input/output schema is available for this endpoint.","The site lists many endpoints but it is unclear which are fully operational versus placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/47","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/item/47","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 the specific functionality of /api/v1/item/47 is undocumented. No OpenAPI spec, no input/output schema, and no example responses are available. The docs pages are gated behind wallet-connect and yielded no content. This is effectively a stub listing with confirmed liveness but unknown 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'/request':13,28 '0.02':12,27,82,153 '000':86 '0x8335':196 '20':85 '2913':197 '300':203 '402':185 '6':92 'Base network API' 'USDC API access' 'accept':192 'access':7,22,114 'addit':157 'ai':54 'analysi':135 'analyt':53 'api':6,21,50,96,113,212 'appear':214 'base':9,24,76,87,199 'base-network' 'behind':217 'beyond':122 'call':4,19,187 'challeng':183 'classif':138 'collect':44 'commit':104 'connect':221 'contract':195 'convers':146 'crawl':232 'data':52 'decim':93 'doc':209 'document':121,158,227 'embed':139 'endpoint':32,63,108,131,171,175 'exact':117 'exchang':142 'feed':141 'financ':57 'function':118 'gate':65,222 'generat':148 'generic':124 'geocod':144 'http':184 'infrastructur':60 'input/output':165 'item':170 'key':97 'label':111 'learn':56 'limit':100 'list':79,128 'live':177 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':55 'mainnet':200 'metric':132 'micropayment API' 'minimum':103 'network':77 'no-api-key' 'numer':129 'offer':42 'openapi':161 'page':213 'part':36 'particular':169 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':69,190 'per':3,18,48,83 'platform':40 'point':155 'post':189 'post-endpoint' 'precis':164 'premium':5,20,112 'price':80,140,154,210 'protocol':70 'rate':99,143 'report':133 'request':49,84 'requir':105 'retriev':229 'return':179 'schema':166 'second':204 'sentiment':134 'settl':71 'site':127,207 'span':51 'spec':162 'specif':107 'summar':137 'technic':226 'text':136 'timeout':205 'titl':125 'unit':88 'unknown':173 'usdc':15,30,73,90,194 'usdc-settlement' 'util':61 'valid':145,181 'via':10,25,66,188 'wallet':220 'wallet-connect':219 'web3':58 'without':156 'x402':11,26,68,182 'x402 API' 'x402-payment'","prices":[{"id":"33433fc7-fa11-446b-beb3-77b887dc8894","listingId":"13b3f57b-7cb8-4ab3-986f-1db6f14e1444","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/item/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:39.329Z"}],"sources":[{"listingId":"13b3f57b-7cb8-4ab3-986f-1db6f14e1444","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:39.329Z","lastSeenAt":"2026-04-23T09:00:46.916Z"}],"details":{"listingId":"13b3f57b-7cb8-4ab3-986f-1db6f14e1444","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/47 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/item/47"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/47"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints without subscriptions"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API calls"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","Anyone looking for free or trial-tier API access","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.222Z"},"updatedAt":"2026-04-23T09:00:46.916Z"}}