{"id":"74bbfd77-673f-4270-806b-ce4ab4206162","shortId":"UTMVSn","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/21` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all subpages just show \"Connect wallet\"), so the actual behavior and response schemas of individual endpoints are undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'","No OpenAPI or schema available; request body format and response structure are unknown","The endpoint path '/api/v1/orders/21' with description 'Premium API Access' is generic and its specific function is unclear","The broader platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/21","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/orders/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no documentation of request/response formats, and all doc/pricing/API subpages are empty stubs showing only 'Connect wallet'. The specific purpose of /api/v1/orders/21 ('Premium API Access') is vague and undifferentiated from the rest of the catalog. Effectively a stub 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'/call':13,28 '0.02':12,27,74,130,183 '000':120 '0x8335':125 '20':119 '300':142 '402':114 '402 payment api' '6':133 'accept':147 'access':110 'across':50 'actual':203 'advertis':156 'ai/ml':53 'analysi':160 'analyt':52 'api':5,20,37,81,109 'application/json':152 'attach':92 'base':8,23,65,121,127 'base network api' 'base-network' 'behavior':204 'beyond':188 'broad':42 'broader':154 'caller':90 'catalog':43 'challeng':115 'classif':163 'commit':89 'connect':199 'convers':175 'data':51,177 'decim':134 'document':187 'embed':164 'empti':194 'enabl':36 'endpoint':49,60,102,146,157,210 'equal':129 'essenti':193 'estim':172 'exact':139 'exchang':167 'feed':166 'finance/web3':55 'gas':171 'generat':178 'geocod':173 'header':96 'howev':186 'individu':209 'infer':54 'json-response' 'key':82 'land':190 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':40 'page':191 'pay':2,17,46 'pay per call api' 'pay-per-request':1,16,45 'payment':95,136 'per':3,18,47,75 'platform':6,21,38,78,155 'point':185 'post':148 'post-method' 'premium':108 'price':72,165,184 'quot':170 'rate':84,168 'request':4,19,48,76,99,116,149 'requir':79 'respons':206 'return':112,151 'schema':207 'scheme':137 'second':143 'sentiment':159 'servic':58 'settl':62 'show':198 'simpli':91 'specif':101 'subpag':196 'summar':162 'text':161 'timeout':144 'token':169 'undocu':212 'uniform':71 'unit':122 'upfront':88 'usdc':15,30,68,124,131 'usdc api' 'usdc-settlement' 'use':67,132 'util':57 'valid':174 'via':10,25 'wallet':200 'x402':11,26,35,94 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b3bf5f93-ae29-4f9f-820a-ad969c921d9d","listingId":"74bbfd77-673f-4270-806b-ce4ab4206162","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/orders/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:21.331Z"}],"sources":[{"listingId":"74bbfd77-673f-4270-806b-ce4ab4206162","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:21.331Z","lastSeenAt":"2026-04-23T22:01:42.666Z"}],"details":{"listingId":"74bbfd77-673f-4270-806b-ce4ab4206162","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/21 \\\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":"Uniform pricing of $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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/orders/21"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using x402 protocol","Integrating low-cost per-request services into workflows settled on Base L2"],"bestFor":["Agents or developers who want zero-setup, pay-as-you-go API access","x402-compatible clients looking for cheap per-call endpoints on Base","Prototyping integrations where $0.02/request is acceptable overhead"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume production workloads where per-request crypto settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.906Z"},"updatedAt":"2026-04-23T22:01:42.666Z"}}