{"id":"adb7ab70-d985-4c3e-9b1f-d7dd302589b8","shortId":"4ZH8DM","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/152` 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 uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transactions/152`) is labeled \"Premium API Access\" but its actual functionality is unclear from the available documentation. The docs, API reference, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data this endpoint returns. Callers should be aware that the endpoint's behavior must be discovered empirically.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API gateway"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the 402 challenge","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no useful content","The specific purpose of /api/v1/transactions/152 ('Premium API Access') is not explained anywhere","No request body schema or response schema is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/152","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/152","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 OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The actual functionality of /api/v1/transactions/152 is undocumented, making this effectively a stub 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'/request':13,28 '0.02':12,27,78,154 '000':72 '20':71 '402':66 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92,165 'across':112 'actual':168 'addit':193 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,164,178 'attach':95 'avail':174 'awar':215 'base':8,23,51,73 'behavior':220 'broader':108 'call':4,19,80 'caller':93,212 'categori':114 'challeng':67 'classif':129 'connect':188 'content':194 'convers':146 'crypto API gateway' 'data':115,119,208 'descript':205 'discov':223 'doc':177 'document':175 'embed':130 'empir':224 'endpoint':55,111,149,159,210,218 'estim':140 'exampl':202 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':169 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':162 'learn':124 'limit':89 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment API' 'must':221 'network':9,24,52 'no-api-key' 'offer':110 'openapi':198 'page':183 'particular':158 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,155 'platform':6,21,39,82,109 'premium':60,163 'price':133,152,180 'prompt':190 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':182 'refer':179 'render':185 'report':118 'request':37,68,156 'request/response':201 'return':64,211 'schema':199 'sentiment':125 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'unclear':171 'uniform':151 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':189 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"d5c656c9-3c74-450d-bf4a-c9c8c0243a8b","listingId":"adb7ab70-d985-4c3e-9b1f-d7dd302589b8","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/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:43.684Z"}],"sources":[{"listingId":"adb7ab70-d985-4c3e-9b1f-d7dd302589b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/152","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:43.684Z","lastSeenAt":"2026-04-23T21:32:38.164Z"}],"details":{"listingId":"adb7ab70-d985-4c3e-9b1f-d7dd302589b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/152 \\\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/152"},{"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/152"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or transaction information via a single pay-per-call request","Integrating x402-compatible payment flows into agent workflows","Testing x402 protocol payment challenges on Base network"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-as-you-go API access","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.273Z"},"updatedAt":"2026-04-23T21:32:38.164Z"}}