{"id":"d78de3a3-f148-494f-814f-ab0f2430ea1e","shortId":"YPmJXY","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/101` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind the `/api/v1/payments/101` endpoint is not documented beyond its title \"Premium API Access.\" The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content.","The specific functionality of /api/v1/payments/101 ('Premium API Access') is unknown; no request or response schema is provided.","No OpenAPI specification or ai-plugin manifest found.","The platform lists many endpoint categories (AI, analytics, finance, etc.) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/101","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/101","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 x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is completely undocumented. The docs pages returned only 'Connect wallet' with no content. This is effectively a stub 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'/request':151 '0.02':12,28,75,150 '000':69 '20':68 '402':212 'Base network API' 'USDC micropayment API' 'accept':48 'access':7,23,63,170 'actual':221 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':6,22,40,62,79,107,169 'attach':90 'avail':200 'base':9,25,53,70 'behind':158 'beyond':165 'broader':103 'call':4,20,77 'caller':88 'categori':108 'challeng':214 'charg':65 'classif':124 'commit':85 'confirm':207 'connect':181 'content':187 'convers':141 'crawl':203 'crypto-paid API' 'data':110,114,217 'detail':198 'doc':172 'document':164,199 'embed':125 'endpoint':57,144,161,205 'estim':135 'exampl':195 'exchang':130 'export':115 'feed':129 'financ':126 'function':157 'gas':134 'generat':142 'geocod':139 'header':95 'howev':154 'i.e':74 'includ':109 'infrastructur':137 'insight':116 'key':80 'label':60 'learn':119 'limit':82 'list':146 'live':208 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':118 'metric':112 'multipl':106 'network':54 'no-api-key' 'no-rate-limit' 'openapi':191 'page':176 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payment':50,94,100,225 'per':3,13,19,29,38,76 'platform':41,104 'point':153 'premium':5,21,61,168 'premium API access' 'price':128,152,173 'prompt':183 'proof':101 'protocol':46 'quot':133 'rate':81,131 'readm':175 'report':113 'request':14,30,39 'request/response':194 'requir':87 'return':178,209,222 'schema':192 'sentiment':120 'servic':219 'simpli':89 'specif':56,156 'success':224 'summar':123 'text':122 'titl':167 'token':132 'unit':71 'unknown':227 'upfront':84 'upon':223 'usdc':16,32,49,73 'usdc-base' 'use':43 'util':138 'valid':98,140,211 'via':10,26 'wallet':182 'web3':127 'x':93 'x-payment':92 'x402':11,27,45,99,213 'x402 API' 'x402-payment'","prices":[{"id":"dfe4322f-2589-474d-89b6-8d210104165e","listingId":"d78de3a3-f148-494f-814f-ab0f2430ea1e","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/101","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:28.156Z"}],"sources":[{"listingId":"d78de3a3-f148-494f-814f-ab0f2430ea1e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/101","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:28.156Z","lastSeenAt":"2026-04-23T17:31:47.432Z"}],"details":{"listingId":"d78de3a3-f148-494f-814f-ab0f2430ea1e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/101 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/101"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/101"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.778Z"},"updatedAt":"2026-04-23T17:31:47.432Z"}}