{"id":"ee6aba6b-c982-4c93-a70d-f7b17a19db16","shortId":"zzkxLt","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/203` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transactions/203` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example payloads. Without paying and calling the endpoint, the actual response format and data returned remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no technical content","The specific functionality of /api/v1/transactions/203 ('Premium API Access') is undocumented; it is unclear what data or service it provides","No OpenAPI spec, input schema, or output schema is available","No example requests or responses can be constructed without more information"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/203","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/203","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, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no example requests or responses, and the actual functionality behind 'Premium API Access' at /api/v1/transactions/203 is completely opaque. All doc pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,80,151 '000':74 '20':73 '402':66 '402 payment endpoint' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,168 'actual':199 'addit':185 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,167 'attach':93 'base':8,23,51,75 'behind':158 'beyond':163 'broader':106 'call':4,19,82,195 'caller':91 'categori':111 'challeng':67 'classif':127 'connect':180 'convers':144 'crawl':170 'crypto-paid API' 'data':113,117,203 'doc':171 'document':162,187 'embed':128 'endpoint':55,147,197 'estim':138 'exampl':190 'exchang':133 'export':118 'feed':132 'financ':129 'format':201 'function':157 'gas':137 'generat':145 'geocod':142 'header':98 'howev':154 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'key':85 'label':165 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'page':175 'pay':2,17,35,193 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':191 'payment':48,69,97,103 'per':3,18,36,81,152 'platform':6,21,39,107 'premium':60,166 'price':131,149,172 'prompt':182 'proof':104 'protocol':44 'quot':136 'rate':87,134 'readm':174 'remain':205 'report':116 'request':37,153 'requir':68,90 'respons':200 'return':64,177,204 'schema':188 'sentiment':123 'simpli':92 'specif':54,156 'summar':126 'technic':186 'text':125 'token':135 'unit':76 'unknown':206 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':181 'web3':130 'without':192 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"824ed8c7-9f75-480f-99cc-fbca4e5324f0","listingId":"ee6aba6b-c982-4c93-a70d-f7b17a19db16","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/203","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:12.069Z"}],"sources":[{"listingId":"ee6aba6b-c982-4c93-a70d-f7b17a19db16","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/203","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:12.069Z","lastSeenAt":"2026-04-23T19:01:46.021Z"}],"details":{"listingId":"ee6aba6b-c982-4c93-a70d-f7b17a19db16","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/203 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/203"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/203"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic transaction data retrieval without subscription commitments"],"bestFor":["Developers who want zero-commitment, per-call API pricing","AI agents with x402-compatible payment capabilities","Users already holding USDC on Base network"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk/subscription pricing","Developers without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.951Z"},"updatedAt":"2026-04-23T19:01:46.021Z"}}