{"id":"801b012d-021b-4247-a7ad-7686e158a36c","shortId":"afqjFt","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/256` 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 being listed here (`/api/v1/transactions/256`) does not clearly map to any of these advertised categories — its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular transactions endpoint actually does. Callers should be aware that the actual behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["infrastructure","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, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The endpoint '/api/v1/transactions/256' has no description of its actual functionality or response format","No OpenAPI or output schema provided beyond the basic x402 challenge metadata","This endpoint does not clearly map to any of the advertised API categories on the landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/256","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/256","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually returns. No OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint path '/api/v1/transactions/256' with description 'Premium API Access' is 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'/api/v1/transactions/256':56,163 '/docs':197 '/pricing':199 '/readme':201 '/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':62,92,180 'across':112 'actual':231,239 'advertis':83,172 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,179 'attach':95 'awar':236 'base':8,23,51,73 'behavior':240 'broader':108 'call':4,19,80 'caller':93,233 'categori':114,173 'challeng':67 'classif':129 'clear':166 'connect':207 'content':213 'convers':146 'crypto-paid API' 'data':115,119,187 'descript':175,224 'document':184,192 'embed':130 'endpoint':55,111,149,159,230,243 'estim':140 'exampl':221 'exchang':135 'export':120 'extrem':194 'feed':134 'financ':131 'four':113 'function':189 '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':58,151,161 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'map':167 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'openapi':217 'page':202 'particular':228 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,178 'price':133 'prompt':209 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':204 'report':118 'request':37,68,155 'request/response':220 'return':64,191 'schema':218 'sentiment':125 'simpli':94,177 'spars':195 'specif':54,158 'substant':212 'summar':128 'text':127 'token':137 'transact':229 'undocu':245 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':208 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"eb9a504b-80b8-48f1-b9d9-f0dffeb3ba5d","listingId":"801b012d-021b-4247-a7ad-7686e158a36c","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/256","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:46.286Z"}],"sources":[{"listingId":"801b012d-021b-4247-a7ad-7686e158a36c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/256","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:46.286Z","lastSeenAt":"2026-04-24T13:03:15.439Z"}],"details":{"listingId":"801b012d-021b-4247-a7ad-7686e158a36c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/256 \\\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/transactions/256"},{"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 address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/256"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven workflows that settle per-call costs in USDC on Base","Exploring x402 protocol integration with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption settled in USDC"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request crypto settlement overhead matters","Anyone needing to understand the exact response schema before calling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.248Z"},"updatedAt":"2026-04-24T13:03:15.439Z"}}