{"id":"a5257eab-5e5b-4015-8d5b-9feeb8b9b3fb","shortId":"uZRC6D","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/85` 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 (`/api/v1/transactions/85`) does not clearly map to any of these advertised categories, and its actual functionality is undocumented.\n\nDocumentation is extremely thin — 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 the `/api/v1/transactions/85` endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt","The endpoint path /api/v1/transactions/85 does not match any of the advertised API categories on the landing page","No OpenAPI schema or request/response examples are provided","Actual functionality of this specific endpoint is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/85","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/85","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, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's purpose is unclear. The docs pages are empty stubs. This is effectively a stub 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'/api/v1/transactions/85':56,161,214 '/docs':183 '/pricing':185 '/readme':187 '/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66,222 '402 payment protocol' 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92 'across':112 'actual':174,216 'advertis':83,170 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85 'attach':95 'base':8,23,51,73 'broader':108 'call':4,19,80 'caller':93 'categori':114,171 'challeng':67,223 'classif':129 'clear':164 'confirm':224 'connect':193 'content':199 'convers':146 'crypto API access' 'data':115,119,232 'descript':210 'document':178,227 'embed':130 'endpoint':55,111,149,159,215,219 'estim':140 'exampl':207 'exchang':135 'export':120 'extrem':180 'feed':134 'financ':131 'four':113 'function':175 'gas':139 'generat':147 'geocod':144 'header':100 'howev':156 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'learn':124 'limit':89 'list':58,151 'live':221 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'map':165 'metric':117 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':110 'openapi':203 'page':188 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60 'price':133 'probe':160 'prompt':195 'proof':106 'protocol':44 'provid':236 'quot':138 'rate':88,136 'render':190 'report':118 'request':37,68,155 'request/response':206 'return':64,217 'schema':204 'sentiment':125 'servic':234 'simpli':94 'specif':54,158 'substant':198 'summar':128 'text':127 'thin':181 'token':137 'unclear':230 'undocu':177 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':194 'web3':132 'without':226 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"8c0d3874-8869-404d-8f93-fe9ce48f6545","listingId":"a5257eab-5e5b-4015-8d5b-9feeb8b9b3fb","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:13.690Z"}],"sources":[{"listingId":"a5257eab-5e5b-4015-8d5b-9feeb8b9b3fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:13.690Z","lastSeenAt":"2026-04-23T06:31:40.501Z"}],"details":{"listingId":"a5257eab-5e5b-4015-8d5b-9feeb8b9b3fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/85 \\\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/85"},{"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/85"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to API services without traditional API key registration","Agent-driven workflows that pay per call using USDC on Base","Accessing transaction data or premium content behind a micropayment wall"],"bestFor":["Developers wanting zero-signup, pay-as-you-go 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 rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.68Z"},"updatedAt":"2026-04-23T06:31:40.501Z"}}