{"id":"cee18163-848f-434e-8a8b-d813fe634dab","shortId":"72ceF7","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/accounts/73` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) 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.\n\nThis particular endpoint (`/api/v1/accounts/73`) falls under \"Premium API Access\" but its exact functionality is not documented beyond the title. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content, so the specific request/response schema for this endpoint is unknown. Callers should be aware that the endpoint accepts POST requests and returns application/json, but the input parameters and output structure are not publicly documented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content","The specific functionality of /api/v1/accounts/73 ('Premium API Access') is undocumented; input parameters and response schema are unknown","No OpenAPI or machine-readable schema provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/73","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/accounts/73","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 pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific purpose of /api/v1/accounts/73 is unclear beyond its 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'/request':13,28 '0.02':12,27,78,155 '000':72 '20':71 '402':66 '402 payment api' 'accept':46,214 'access':62,92,168 'across':112 'addit':195 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,167 'application/json':219 'attach':95 'awar':210 'base':8,23,51,73 'base network api' 'beyond':176 'broader':108 'call':4,19,80 'caller':93,207 'categori':114 'challeng':67 'classif':129 'connect':190 'content':196 'convers':146 'crawl':180 'data':115,119 'doc':181 'document':175,230 'embed':130 'endpoint':55,111,149,162,204,213 'estim':140 'exact':171 'exchang':135 'export':120 'fall':164 'feed':134 'financ':131 'four':113 'function':172 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'input':222 'insight':121 'instant':91 'json-response' 'key':86 'learn':124 'limit':89 'list':58,151 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'output':225 'page':185 'paramet':223 'particular':161 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,156 'platform':6,21,39,82,109 'point':159 'post':215 'post-method' 'premium':60,166 'price':133,158,182 'prompt':192 'proof':106 'protocol':44 'public':229 'quot':138 'rate':88,136 'readm':184 'report':118 'request':37,68,157,216 'request/response':200 'return':64,187,218 'schema':201 'sentiment':125 'simpli':94 'specif':54,199 'structur':226 'summar':128 'text':127 'titl':178 'token':137 'unit':74 'unknown':206 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':191 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"f1a7d173-6f5f-438b-9be1-5fd11eb521ee","listingId":"cee18163-848f-434e-8a8b-d813fe634dab","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/accounts/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:04.318Z"}],"sources":[{"listingId":"cee18163-848f-434e-8a8b-d813fe634dab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:04.318Z","lastSeenAt":"2026-04-24T20:02:18.120Z"}],"details":{"listingId":"cee18163-848f-434e-8a8b-d813fe634dab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/73 \\\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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/73"},{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/73"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium account data via a single micropayment without subscription or API key","Integrating pay-per-call endpoints into agent workflows that settle payments on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume callers who want to avoid subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where $0.02/request adds up quickly","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.176Z"},"updatedAt":"2026-04-24T20:02:18.120Z"}}