{"id":"7fab6b14-e8fb-426d-84ed-a1a791fb53e2","shortId":"Q5Q6Ab","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/payments/37` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed descriptions of what each endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what payload to send or what response to expect from this particular \"Premium API Access\" endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","no-auth API","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/payments/37 ('Premium API Access') is unclear and may be a generic or placeholder endpoint","No request or response examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/37","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, documentation is essentially nonexistent — all doc pages return only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of this specific '/api/v1/payments/37' endpoint beyond 'Premium API Access' is unknown. The listing is effectively a 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'/request':12,28 '0.02':11,27,66,132,135,163 '000':127 '20':126 '402':121 'Base network API' 'USDC API' 'access':117,238 'account':86 'across':52 'actual':205 'addit':141 'advertis':140 'ai-inference' 'ai/ml':55 'analysi':145 'analyt':54 'api':5,14,21,30,39,83,116,173,237 'attach':93 'base':8,24,74,128,137 'broad':44 'call':4,20 'caller':91 'catalog':45 'challeng':122,217 'classif':148 'classification' 'connect':182 'content':188 'convers':156 'crawl':171 'crypto-paid API' 'data':53 'data-analytics' 'descript':200 'detail':199 'doc':172 'document':166,220 'embed':149 'embeddings' 'enabl':38 'endpoint':51,62,109,142,204,208,239 'exampl':196 'exchang':152 'expect':232 'extrem':168 'feed':151 'finance-data' 'finance/web3':57 'geocod':154 'geocoding' 'header':98 'i.e':134 'infer':56 'key':15,31,84 'limit':90 'list':113 'live':210 'lowpaymentfee' 'lowpaymentfee.com':33 'mean':79 'micropayment API' 'network':75 'no-api-key' 'no-auth API' 'offer':42 'openapi':192 'page':177 'paid':69 'particular':235 'pay':2,18,48 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':47 'payload':225 'payment':97,102 'per':3,19,49,67 'platform':6,22,40,139 'point':165 'premium':115,236 'price':64,150,164,174 'prompt':184 'proof':103 'protocol':78 'rate':89,153 'readm':176 'request':50,68,106,123 'request/response':195 'requir':16,32 'respond':212 'respons':230 'return':119,179,206 'schema':193 'send':227 'sentiment':144 'sentiment-analysis' 'servic':60 'simpli':92 'spars':169 'specif':108 'substant':187 'summar':147 'text':146 'text-summarization' 'unclear':223 'unit':129 'usdc':71,131,133 'usdc-base' 'util':59 'utility-services' 'valid':101,155,215 'via':9,25 'wallet':183 'without':219 'x':96 'x-payment':95 'x402':10,26,37,77,216 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"c38e5dd0-ac72-4a8f-85fd-d1afaf436dd4","listingId":"7fab6b14-e8fb-426d-84ed-a1a791fb53e2","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:45.868Z"}],"sources":[{"listingId":"7fab6b14-e8fb-426d-84ed-a1a791fb53e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:45.868Z","lastSeenAt":"2026-04-23T02:01:19.881Z"}],"details":{"listingId":"7fab6b14-e8fb-426d-84ed-a1a791fb53e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/37 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USDC) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/37"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/37"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Exporting analytics data or generating insights reports without subscription commitments"],"bestFor":["Developers who want zero-friction, keyless API access via crypto micropayments","Agents and bots that need programmatic pay-per-call access to diverse utility endpoints","Projects already operating on the Base network with USDC"],"notFor":["Teams requiring detailed API documentation, SLAs, or guaranteed uptime","High-volume users who would benefit from bulk pricing or subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.147Z"},"updatedAt":"2026-04-23T02:01:19.881Z"}}