{"id":"610ebcf1-a2a6-4f83-a3ef-5a2ce31e2965","shortId":"mHPrTg","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/171` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across 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 endpoints are listed at the same $0.02 per request price point and settle in USDC on Base.\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 schema, no request/response examples, and no detailed descriptions of what each endpoint actually returns. The x402 challenge for this specific endpoint is live and well-formed, confirming the payment mechanism works, but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-request API","USDC API","Base network API","cheap API calls"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no actual content","No OpenAPI or schema available — request and response formats are unknown","The specific endpoint /api/v1/charges/171 is labeled 'Premium API Access' but its actual functionality is undocumented","Cannot verify what data or service this endpoint provides beyond the generic label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/171","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/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and costs $0.02 USDC on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet' with no content. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint returns or what input it expects. The listing is effectively a 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'/request':17,34 '0.02':16,33,85,163 '000':80 '20':79 'Base network API' 'USDC API' 'access':45,71,100 'across':120 'actual':212 'advertis':91 'ai':10,27,130 'ai-inference' 'analysi':134 'analyt':124 'api':4,21,41,70,93,180 'attach':103 'base':7,24,59,81,173 'base-network' 'behind':51 'broader':116 'call':88 'caller':101 'categori':122 'challeng':216 'cheap API calls' 'classif':137 'classification' 'confirm':227 'connect':189 'content':195 'convers':154 'data':9,26,123,127 'data-analytics' 'descript':207 'detail':206 'difficult':239 'doc':179 'document':174,236 'embed':138 'embeddings' 'endpoint':14,31,50,63,119,157,211,220 'estim':148 'exampl':203 'exchang':143 'expect':250 'export':128 'extrem':176 'feed':142 'financ':11,28,139 'finance-data' 'form':226 'four':121 'gas':147 'gate':3,20,44 'generat':155 'geocod':152 'geocoding' 'header':108 'infrastructur':150 'insight':129 'instant':99 'key':94 'know':241 'lack':234 'learn':132 'limit':97 'list':67,159 'live':222 'low payment fee' 'lowpaymentfee.com':35 'machin':131 'make':237 'mechan':230 'metric':125 'micropay':56 'micropayment API' 'network':60 'no-api-key' 'offer':8,25,118 'openapi':199 'page':184 'pay-per-request API' 'payload':243 'payment':75,107,113,229 'per':53,87,164 'per-request':52 'per-request-billing' 'platform':5,22,42,90,117 'point':167 'premium':69 'price':141,166,181 'prompt':191 'proof':114 'protocol':40 'quot':146 'rate':96,144 'readm':183 'render':186 'report':126 'request':54,165 'request/response':202 'requir':73 'respons':248 'return':213 'schema':200 'send':245 'sentiment':133 'sentiment-analysis' 'settl':169 'simpli':102 'spars':177 'specif':62,219 'summar':136 'text':135 'text-summarization' 'token':145 'unit':82 'usd':86 'usdc':55,84,171 'usdc-micropayment' 'util':13,30,151 'utility-services' 'valid':111,153 'varieti':48 'wallet':190 'web3':140 'well':225 'well-form':224 'work':231 'x':106 'x-payment':105 'x402':2,19,39,112,215 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9c9fde9a-6cf8-48df-be6d-07bcca378ad6","listingId":"610ebcf1-a2a6-4f83-a3ef-5a2ce31e2965","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/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:22.464Z"}],"sources":[{"listingId":"610ebcf1-a2a6-4f83-a3ef-5a2ce31e2965","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/171","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:22.464Z","lastSeenAt":"2026-04-22T18:31:26.527Z"}],"details":{"listingId":"610ebcf1-a2a6-4f83-a3ef-5a2ce31e2965","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/171 \\\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 requiring up to 20,000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/171"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/171"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time finance data like token quotes, gas estimates, and exchange rates via micropayment","Running data analytics queries and exporting data on a pay-per-use basis","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated API calls at $0.02 each"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.574Z"},"updatedAt":"2026-04-22T18:31:26.527Z"}}