{"id":"c5911466-545f-4042-bbd5-23f4d4e74039","shortId":"mMktuN","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/92` 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 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/Utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02 per-request pricing.\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the `/api/v1/payments/92` endpoint expects or what response it returns. The \"Premium API Access\" label is generic and does not clarify the endpoint's specific function.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/payments/92 ('Premium API Access') is unclear — it does not match any of the named endpoints listed on the homepage","Request and response formats are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/92","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schemas, and the endpoint name 'Premium API Access' is generic with no indication of what it actually does. This is effectively a stub 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'/request':19,38 '0.02':18,37,86,153 '000':80 '20':79 '402':206 '402 payment api' 'access':74,229 'advertis':96 'ai':12,31,122 'ai-inference' 'analysi':126 'analyt':116 'api':5,24,45,73,90,111,164,228 'attach':99 'avail':193 'base':8,27,63,81 'base network api' 'base-network' 'bodi':216 'broad':50 'call':4,23,88 'caller':97 'catalog':51 'categori':114 'challeng':207 'charg':76 'clarifi':236 'classif':129 'classification' 'confirm':201 'connect':173 'content':179 'convers':145 'crawl':196 'data':11,30,115,119 'data-analytics' 'doc':163 'document':158,188,210 'embed':130 'embeddings' 'enabl':44 'endpoint':16,35,57,67,149,199,219,238 'estim':140 'exampl':192 'exchang':135 'expect':220 'export':120 'extrem':160 'feed':134 'financ':13,32,131 'finance-data' 'four':113 'function':241 'gas':139 'generat':146 'generic':232 'geocod':143 'geocoding' 'header':103 'i.e':85 'infrastructure/utilities':142 'insight':121 'key':91 'label':71,230 'learn':124 'limit':94 'list':148 'live':202 'low payment fee' 'lowpaymentfee.com':39 'machin':123 'materi':197 'metric':117 'micropayment api' 'network':64 'no-api-key' 'offer':10,29 'openapi':183 'organ':109 'page':168 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':102 'per':3,22,55,87,155 'per-request':154 'platform':6,25,46,108 'premium':72,227 'price':133,157,165 'prompt':175 'proper':205 'provid':48 'quot':138 'rate':93,136 'readm':167 'render':170 'report':118 'request':56,106,156,215 'request/response':186 'respons':223 'return':203,225 'schema':187 'sentiment':125 'sentiment-analysis' 'settl':58 'share':150 'simpli':98 'spars':161 'spec':184 'specif':66,240 'summar':128 'text':127 'text-summarization' 'token':137 'unclear':213 'unit':82 'usag':191 'usdc':9,28,60,84 'usdc api' 'usdc-settlement' 'util':15,34 'valid':144 'wallet':174 'web3':132 'without':209 'x402':43,101 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6dfe3a4e-df30-4799-8181-fbe0249ab0b7","listingId":"c5911466-545f-4042-bbd5-23f4d4e74039","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:56.265Z"}],"sources":[{"listingId":"c5911466-545f-4042-bbd5-23f4d4e74039","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:56.265Z","lastSeenAt":"2026-04-23T02:01:20.376Z"}],"details":{"listingId":"c5911466-545f-4042-bbd5-23f4d4e74039","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/92 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/92"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/92"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting data on a per-request payment basis","Geocoding and utility operations paid per call via USDC on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agent workflows that can attach x402 payment headers automatically","Users who prefer crypto-native (USDC on Base) micropayments over subscription billing"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need fiat-only payment options (only USDC on Base is supported)","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.551Z"},"updatedAt":"2026-04-23T02:01:20.376Z"}}