{"id":"67a0b385-08c6-4655-8e6e-ef53ee07e4d6","shortId":"sjz3SM","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/41` 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 $0.02 per request. However, the specific endpoint probed here (`/api/v1/transactions/41`) does not clearly map to any of these advertised categories — its purpose beyond \"Premium API Access\" is not documented.\n\nDocumentation is extremely thin. The /docs, /pricing, /api, 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 description of what data or functionality this particular transactions endpoint returns. The endpoint is live and responds with a well-formed x402 challenge, but the actual payload it delivers after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint path /api/v1/transactions/41 does not match any of the advertised API categories on the homepage","Actual response payload after payment is completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/41","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/41","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 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of this specific transactions/41 endpoint is undocumented. The listing is effectively a 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'/api/v1/transactions/41':56,162 '/docs':187 '/pricing':188 '/readme':191 '/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,178 'across':112 'actual':240 'advertis':83,171 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,177 'attach':95 'base':8,23,51,73 'beyond':175 'broader':108 'call':4,19,80 'caller':93 'categori':114,172 'challeng':67,237 'classif':129 'clear':165 'connect':197 'content':203 'convers':146 'crypto-paid API' 'data':115,119,217 'deliv':243 'descript':214 'document':181,182 'embed':130 'endpoint':55,111,149,159,223,226 'estim':140 'exampl':211 'exchang':135 'export':120 'extrem':184 'feed':134 'financ':131 'form':235 'four':113 'function':219 'gas':139 'generat':147 'geocod':144 'header':100 'howev':156 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'learn':124 'limit':89 'list':58,151 'live':228 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'map':166 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'openapi':207 'page':192 'particular':221 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':241 'payment':48,99,105,245 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,176 'price':133 'probe':160 'prompt':199 'proof':106 'protocol':44 'purpos':174 'quot':138 'rate':88,136 'render':194 'report':118 'request':37,68,155 'request/response':210 'respond':230 'return':64,224 'schema':208 'sentiment':125 'simpli':94 'specif':54,158 'summar':128 'text':127 'thin':185 'token':137 'transact':222 'unit':74 'unknown':247 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':198 'web3':132 'well':234 'well-form':233 'x':98 'x-payment':97 'x402':11,26,43,104,236 'x402 API' 'x402-payment'","prices":[{"id":"058dbe55-39f2-4a5a-a562-c324e404e651","listingId":"67a0b385-08c6-4655-8e6e-ef53ee07e4d6","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:50.233Z"}],"sources":[{"listingId":"67a0b385-08c6-4655-8e6e-ef53ee07e4d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:50.233Z","lastSeenAt":"2026-04-23T08:31:55.700Z"}],"details":{"listingId":"67a0b385-08c6-4655-8e6e-ef53ee07e4d6","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid USDC payment proof on Base.\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/41 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/transactions/41"},{"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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/41"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.782Z"},"updatedAt":"2026-04-23T08:31:55.700Z"}}