{"id":"b390551e-2958-41ad-a263-12aeb7b9a56a","shortId":"TbR9hV","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace offering a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The platform uses the x402 payment protocol: callers receive a 402 challenge with payment details, settle in USDC, and get immediate access to the response.\n\nThe specific endpoint at `/api/v1/products/35` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request/response format for the paid endpoint is unknown","Documentation pages require wallet connection and provide no public content","The endpoint name 'Premium API Access' is generic; it is unclear what specific data or service /api/v1/products/35 returns after successful payment","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/35","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/products/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live and returns a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response payloads for the actual product endpoint, and the docs/pricing/README pages all require wallet connection and yield no useful content. The endpoint name 'Premium API Access' is generic and doesn't describe what data or service is returned after 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'/call':13,28 '0.02':12,27,56,133,187 '000':122 '0x8335':127 '20':121 '2913':128 '300':146 '402':87,116 '402 payment api' '6':137 'accept':151 'access':98,112 'across':44 'advertis':160 'ai/ml':47 'analysi':164 'analyt':46 'api':5,20,37,68,111 'appear':194 'application/json':156 'avail':210 'base':8,23,64,123,130 'base network api' 'broader':158 'caller':84 'challeng':88,117 'classif':167 'commit':75 'connect':198 'convers':179 'cost':55 'crawl':213 'data':45,181 'decim':138 'detail':91,202 'document':190 'embed':168 'enabl':36 'endpoint':43,54,104,150,161,207 'equal':132 'estim':176 'everi':53 'exact':143 'exchang':171 'exist':192 'feed':170 'finance/web3':49 'gas':175 'generat':182 'geocod':177 'get':96 'given':134 'immedi':97 'individu':206 'infer':48 'infrastructur':51 'json-response' 'key':69 'limit':72 'list':108 'low payment fee' 'lowpaymentfee.com':31 'marketplac':38 'micropayment api' 'network':9,24,65 'no-api-key' 'offer':39 'page':191 'paid':59 'pay':2,17 'pay per call api' 'pay-per-request':1,16 'payment':82,90,140 'per':3,18,57 'platform':6,21,78,159 'point':189 'post':152 'post-method' 'premium':110 'price':169,188 'protocol':83 'quot':174 'rate':71,172 'receiv':85 'request':4,19,58,118,153 'request/response':203 'requir':76,196 'respons':101 'return':114,155 'schema':204 'scheme':141 'second':147 'sentiment':163 'settl':92 'specif':103 'summar':166 'text':165 'timeout':148 'token':173 'unit':124 'usdc':15,30,61,94,126,135 'usdc api' 'usdc-base-network' 'use':79 'util':52 'valid':178 'varieti':41 'via':10,25 'view':200 'wallet':197 'x402':11,26,35,81 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bbfd2e06-cfe6-4eae-8c68-c15888e2e3ee","listingId":"b390551e-2958-41ad-a263-12aeb7b9a56a","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/products/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:21.021Z"}],"sources":[{"listingId":"b390551e-2958-41ad-a263-12aeb7b9a56a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:21.021Z","lastSeenAt":"2026-04-23T18:03:20.076Z"}],"details":{"listingId":"b390551e-2958-41ad-a263-12aeb7b9a56a","quickStartSnippet":"# 1. Send POST to the endpoint — receive 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/products/35\n# 2. Parse the 402 JSON for payment details (payTo, asset, maxAmountRequired)\n# 3. Sign an x402 payment and include it in the X-PAYMENT header\ncurl -X POST https://lowpaymentfee.com/api/v1/products/35 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/products/35","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/35"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to analytics, AI inference, or financial data with per-call USDC payments","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers or agents wanting zero-friction, keyless API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer pay-per-use"],"notFor":["High-volume consumers needing bulk pricing or subscription discounts","Users without USDC on the Base network","Applications requiring detailed OpenAPI schemas or extensive documentation"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.956Z"},"updatedAt":"2026-04-23T18:03:20.076Z"}}