{"id":"cf890b5f-9160-4d09-829d-8e70cdcc45f7","shortId":"xMaknp","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/157` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe platform organizes its endpoints 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 utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind the \"Premium API Access\" label at path `/api/v1/payments/157` is not described anywhere in the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/payments/157 ('Premium API Access') is not explained — it does not match any of the named endpoints listed on the homepage","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/157","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but documentation is effectively nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, and no examples are available. The specific functionality of the /api/v1/payments/157 endpoint is unclear beyond its 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'/request':19,38,155 '0.02':18,37,86,154 '000':80 '20':79 'Base network API' 'USDC API' 'accept':207 'access':74,218 'actual':212 'advertis':96 'ai':12,31,122 'ai-inference' 'analysi':126 'analyt':116 'anywher':226 'api':5,24,45,73,90,164,217 'attach':99 'avail':193,229 'base':8,27,63,81 'base-network' 'behind':214 'broad':50 'call':4,23,88 'caller':97 'catalog':51 'categori':114 'challeng':200 'charg':76 'classif':129 'confirm':201 'connect':172 'convers':146 'crawl':196 'data':11,30,115,119 'data-analytics' 'describ':225 'detail':179 'doc':162 'document':157,188 'embed':130 'enabl':44 'endpoint':16,35,57,67,111,150,203 'estim':140 'exampl':192 'exchang':135 'export':120 'extrem':159 'feed':134 'financ':13,32,131 'finance-data' 'four':113 'function':213 'gas':139 'generat':147 'geocod':144 'header':103 'i.e':85 'infrastructur':142 'insight':121 'key':91 'label':71,219 'learn':124 'limit':94 'list':149 'live':205 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':123 'materi':197,230 'metric':117 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':183 'organ':109 'page':167 'path':221 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':102 'per':3,22,55,87 'platform':6,25,46,108 'post':208 'premium':72,216 'price':133,156,163 'prompt':174 'provid':48 'quot':138 'rate':93,136 'readm':166 'render':169 'report':118 'request':56,106,209 'request/response':186 'schema':187 'sentiment':125 'settl':58 'share':151 'simpli':98 'spars':160 'spec':184 'specif':66 'summar':128 'technic':178 'text':127 'token':137 'unit':82 'usag':191 'usdc':9,28,60,84 'usdc-settlement' 'util':15,34,143 'utility-services' 'valid':145 'wallet':173 'web3':132 'x402':43,101,199 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"fc97a812-52c8-433e-8eb6-7948f51a1493","listingId":"cf890b5f-9160-4d09-829d-8e70cdcc45f7","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:40.280Z"}],"sources":[{"listingId":"cf890b5f-9160-4d09-829d-8e70cdcc45f7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:40.280Z","lastSeenAt":"2026-04-23T05:01:22.252Z"}],"details":{"listingId":"cf890b5f-9160-4d09-829d-8e70cdcc45f7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/157 \\\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 charges up to 20,000 base units of USDC ($0.02) per request on the Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/157"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/157"},{"claim":"Documentation, pricing, API, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on demand","Exporting data or generating analytics reports with per-request billing"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.183Z"},"updatedAt":"2026-04-23T05:01:22.252Z"}}