{"id":"d00d8a86-70f3-470b-8fc5-1656e73d4316","shortId":"kW4hT5","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":"lowpaymentfee.com is a collection of x402-enabled API endpoints hosted on the Base network, offering pay-per-request access to a variety of services including data analytics, AI/ML inference, finance/Web3 data, and utility/infrastructure tools. Each call costs $0.02 in USDC (USD Coin on Base), settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint `/api/v1/messages/107` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address, with a 300-second timeout. The endpoint returns application/json.\n\nThe broader platform groups its APIs into 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 share the same $0.02 per-request pricing. No OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method","on-chain-settlement"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base network api","usdc api access","premium api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/messages/107 is unclear — 'Premium API Access' is a generic label","No example request or response payloads are documented","Pricing and /README pages returned no useful content (wallet-connect only)"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/107","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/messages/107","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no example payloads, and the specific purpose of /api/v1/messages/107 is undocumented beyond the generic label \"Premium API Access\". The crawled pages beyond the landing page returned only wallet-connect 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'/request':13,28 '0.02':12,27,70,125,198 '000':114 '0x8335':119 '20':113 '2913':120 '300':145 '6':129 'accept':103 'access':7,22,51,101 'address':142 'advertis':109 'ai':168 'ai/ml':60 'analysi':172 'analyt':59,162 'api':6,21,39,83,100,157 'application/json':151 'avail':213 'base':9,24,44,76,115,122 'base network api' 'broader':153 'call':4,19,68 'categori':160 'chain':80 'challeng':108 'classif':175 'coin':74 'collect':34 'convers':191 'cost':69 'crawl':216 'data':58,63,161,165 'decim':130 'detail':206 'document':207 'embed':176 'enabl':38 'endpoint':40,94,149,194 'equal':124 'estim':186 'exact':137 'exampl':209 'exchang':181 'export':166 'feed':180 'financ':177 'finance/web3':62 'four':159 'gas':185 'generat':192 'geocod':189 'given':126 'group':155 'host':41 'includ':57 'infer':61 'infrastructur':188 'insight':167 'json-response' 'key':84 'learn':170 'limit':87 'list':97 'low payment fee' 'lowpaymentfee.com':31 'machin':169 'made':133 'maxamountrequir':111 'metric':163 'micropayment api' 'network':45 'no-api-key' 'offer':46 'on-chain':78 'on-chain-settlement' 'openapi':204 'page':217 'pay':2,17,48 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':47 'payload':211 'payment':131 'payto':141 'per':3,18,49,200 'per-request':199 'platform':154 'post':104 'post-method' 'premium':5,20,99 'premium api' 'price':179,202 'quot':184 'rate':86,182 'report':164 'request':50,105,201 'request/response':210 'requir':91 'return':150 'schema':205 'scheme':138 'second':146 'sentiment':171 'servic':56 'settl':77 'share':195 'specif':93 'subscript':90 'summar':174 'text':173 'timeout':147 'token':183 'tool':66 'unit':116 'usd':73 'usdc':15,30,72,118,127 'usdc api access' 'usdc-base' 'utility/infrastructure':65 'valid':190 'varieti':54 'via':10,25,134 'web3':178 'x402':11,26,37,107,136 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"f9f261a8-9f29-46a8-a884-9d4993197a47","listingId":"d00d8a86-70f3-470b-8fc5-1656e73d4316","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/messages/107","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.864Z"}],"sources":[{"listingId":"d00d8a86-70f3-470b-8fc5-1656e73d4316","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/107","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.864Z","lastSeenAt":"2026-04-22T02:32:05.942Z"}],"details":{"listingId":"d00d8a86-70f3-470b-8fc5-1656e73d4316","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/107 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/107"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/107"},{"claim":"All listed APIs cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per-call for data analytics, AI inference, or financial data via USDC on Base","Programmatic access to utility services (geocoding, validation, conversion) with crypto micropayments"],"bestFor":["Developers and agents who want zero-signup, pay-as-you-go API access","Use cases requiring low-cost micropayments ($0.02) settled on Base L2","Projects already operating with USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.893Z"},"updatedAt":"2026-04-22T02:32:05.942Z"}}