{"id":"80b155b4-e283-443a-b735-1fc51e0be82c","shortId":"QyT5bQ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/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/charges/48` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or accounts 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 priced at $0.02 per request.\n\nHowever, the specific endpoint `/api/v1/charges/48` does not clearly map to any of the named API categories on the landing page, and no documentation, request/response schemas, or examples are available beyond the landing page listing. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without concrete documentation or schema details for this particular endpoint, it is difficult to determine exactly what data or functionality it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","misc"],"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 API pages only show 'Connect wallet' with no content.","The endpoint path /api/v1/charges/48 does not match any of the named APIs listed on the landing page; its actual functionality is unknown.","No request or response schema is provided; callers cannot know what to send or what to expect back.","The platform lists many API categories but none have visible documentation or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/48","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/charges/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no request/response schema, no examples, and the specific endpoint path (/api/v1/charges/48) doesn't correspond to any named service on the landing page. The docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,80,150 '000':74 '20':73 '402':68 'Base network API' 'USDC micropayment API' 'accept':46 'access':62 'account':87 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,84,109,167,191 'attach':92 'avail':181 'base':8,23,51,75 'beyond':182 'broader':105 'call':4,19,82 'caller':90 'categori':110,168 'challeng':69 'classif':126 'clear':160 'concret':205 'connect':197 'content':203 'convers':143 'crypto-paid API' 'data':112,116,221 'detail':209 'determin':218 'difficult':216 'doc':188 'document':175,206 'embed':127 'endpoint':55,146,156,213 'estim':137 'exact':219 'exampl':179 'exchang':132 'export':117 'feed':131 'financ':128 'function':223 'gas':136 'generat':144 'geocod':141 'header':97 'howev':153 'http-post' 'i.e':79 'includ':111 'infrastructur':139 'insight':118 'key':85 'land':171,184 'learn':121 'list':58,186 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'map':161 'metric':114 'multipl':108 'name':166 'network':9,24,52 'no-api-key' 'page':172,185,192 'particular':212 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,96,102 'per':3,18,36,81,151 'platform':6,21,39,106 'premium':60 'premium API access' 'price':130,148,189 'prompt':199 'proof':103 'protocol':44 'quot':135 'rate':133 'render':194 'report':115 'request':37,70,152 'request/response':176 'requir':89 'return':64,225 'schema':177,208 'sentiment':122 'simpli':91 'specif':54,155 'standard':66 'summar':125 'text':124 'token':134 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':140 'valid':100,142 'via':10,25 'wallet':198 'web3':129 'without':204 'x':95 'x-payment':94 'x402':11,26,43,67,101 'x402 API' 'x402-payment'","prices":[{"id":"77e0696a-15dd-4854-9bea-5ee36728b4fb","listingId":"80b155b4-e283-443a-b735-1fc51e0be82c","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/charges/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:20.507Z"}],"sources":[{"listingId":"80b155b4-e283-443a-b735-1fc51e0be82c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:20.507Z","lastSeenAt":"2026-04-22T09:01:02.532Z"}],"details":{"listingId":"80b155b4-e283-443a-b735-1fc51e0be82c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/48"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/48"},{"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":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data 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 pay-per-call protocols","Agents that need keyless, on-demand API access settled in USDC","Users who want no-commitment, no-subscription API usage"],"notFor":["Users needing well-documented, production-grade APIs with clear schemas","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":"2026-02-17T23:14:21.889Z"},"updatedAt":"2026-04-22T09:01:02.532Z"}}