{"id":"2ac21917-c669-4c70-9c58-c41567e54777","shortId":"3ByMGT","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/transactions/386` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits 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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transactions/386` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform. Prospective callers should be aware that the actual response payload and behavior of this endpoint are unknown from publicly available information.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","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 'Connect wallet' with no content.","The specific behavior and response schema of /api/v1/transactions/386 ('Premium API Access') is unknown.","No OpenAPI or machine-readable schema is provided.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/386","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/transactions/386","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 pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The actual functionality behind 'Premium API Access' at this specific path is entirely 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'/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,169 'actual':217 'addit':186 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,168 'attach':93 'avail':200,229 'awar':214 'base':8,23,51,75 'behavior':221 'behind':159 'beyond':164 'broader':106 'call':4,19,82 'caller':91,211 'categori':111 'challeng':67 'classif':127 'connect':181 'content':187 'convers':144 'crawl':171 'crypto-paid API' 'data':113,117 'detail':198 'doc':172 'document':163,199 'embed':128 'endpoint':55,147,206,224 'estim':138 'exampl':195 'exchang':133 'export':118 'feed':132 'financ':129 'function':158 'gas':137 'generat':145 'geocod':142 'header':98 'howev':155 'i.e':79 'includ':112 'inform':230 'infrastructur':140 'insight':119 'json-response' 'key':85 'label':166 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':191 'page':176 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':219 'payment':48,69,97,103 'per':3,18,36,81,153 'platform':6,21,39,107,209 'premium':60,167 'premium API access' 'price':131,150,173 'prompt':183 'proof':104 'prospect':210 'protocol':44 'public':228 'quot':136 'rate':87,134 'readm':175 'report':116 'request':37,154 'request/response':194 'requir':68,90 'respons':218 'return':64,178 'schema':192 'sentiment':123 'simpli':92 'specif':54,157 'summar':126 'text':125 'token':135 'uniform':149 'unit':76 'unknown':226 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':182 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"041c465f-bc0d-4a6b-a53d-f59862f00fe4","listingId":"2ac21917-c669-4c70-9c58-c41567e54777","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/transactions/386","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:37.472Z"}],"sources":[{"listingId":"2ac21917-c669-4c70-9c58-c41567e54777","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/386","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:37.472Z","lastSeenAt":"2026-04-22T07:01:37.992Z"}],"details":{"listingId":"2ac21917-c669-4c70-9c58-c41567e54777","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/386 \\\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) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/386"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/386"},{"claim":"Multiple API categories are listed including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up without bulk discounts","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.362Z"},"updatedAt":"2026-04-22T07:01:37.992Z"}}