{"id":"824ac69c-5396-4a16-82ba-95ec766dd919","shortId":"dxX9KA","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/wire/129` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments 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 listed at the same $0.02/request price point.\n\nHowever, the specific endpoint probed here (`/api/v1/wire/129`) does not clearly map to any of the named API categories on the landing page. Its description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without documentation or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet' with no content","The endpoint path /api/v1/wire/129 does not correspond to any named API on the landing page; its actual functionality is unknown","No response schema or example output is available","No OpenAPI specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/129","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/wire/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC per request on Base). However, there is no documentation, no OpenAPI schema, no example requests or responses, and the specific endpoint's purpose (\"Premium API Access\" at /api/v1/wire/129) is entirely opaque. All doc pages returned only a wallet-connect 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'/request':13,28,155 '0.02':12,27,74,154 '000':68 '20':67 '402 payment API' '6':80 'Base network API' 'USDC API' 'accept':46 'access':62,186 'actual':221 'advertis':109 'ai':121 'analysi':125 'analyt':115 'api':5,20,38,61,83,111,174,185 'attach':94 'base':8,23,51,69 'behavior':222 'broader':107 'call':4,19 'caller':92 'categori':112,175 'charg':64 'classif':128 'clear':167 'commit':89 'connect':208 'content':214 'convers':145 'data':114,118,193 'decim':81 'descript':181 'doc':199 'document':190,216 'embed':129 'endpoint':55,148,161,225 'estim':139 'exampl':218 'exchang':134 'export':119 'feed':133 'financ':130 'function':195 'gas':138 'generat':146 'geocod':143 'header':99 'howev':158 'http-post' 'i.e':73 'includ':113 'infrastructur':141 'insight':120 'key':84 'land':178 'learn':123 'limit':86 'list':58,150 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':122 'map':168 'metric':116 'micropayment API' 'multipl':110 'name':173 'network':9,24,52 'no-api-key' 'page':179,203 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98,104 'per':3,18,36,75 'platform':6,21,39,108 'point':157 'premium':60,184 'price':132,156,200 'probe':162 'prompt':210 'proof':105 'protocol':44 'quot':137 'rate':85,135 'readm':202 'render':205 'report':117 'request':37,76 'requir':91 'respons':219 'return':197 'sentiment':124 'simpli':93,183 'sinc':77 'specif':54,160 'substant':213 'summar':127 'text':126 'token':136 'unit':70 'unknown':227 'upfront':88 'usdc':15,30,47,72,78 'usdc-base-network' 'use':41,79 'util':142 'valid':102,144 'via':10,25 'wallet':209 'web3':131 'without':215 'x':97 'x-payment':96 'x402':11,26,43,103 'x402 API' 'x402-payment'","prices":[{"id":"45a2ce58-de25-4191-a003-05c3b083e2bf","listingId":"824ac69c-5396-4a16-82ba-95ec766dd919","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/wire/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:32.498Z"}],"sources":[{"listingId":"824ac69c-5396-4a16-82ba-95ec766dd919","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/129","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:32.498Z","lastSeenAt":"2026-04-22T21:31:49.260Z"}],"details":{"listingId":"824ac69c-5396-4a16-82ba-95ec766dd919","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/129 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/129"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/129"}],"useCases":["Programmatic access to a pay-per-call API without requiring API key registration","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-crypto payment methods","Production workloads that depend on well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.971Z"},"updatedAt":"2026-04-22T21:31:49.260Z"}}