{"id":"7f4aa747-99d1-46d4-a54c-2277852e5bd6","shortId":"Tb4cXs","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-20`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (USD Coin) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header to each request.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several 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 listed endpoints share the same $0.02/request pricing. However, this particular endpoint (`/api/endpoint-20`) does not clearly map to any of those named services — it may be a generic or demonstration endpoint.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the USDC contract on Base is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The response MIME type is `application/json`. Documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the exact request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","The endpoint path /api/endpoint-20 does not match any of the named API routes listed on the landing page; its actual functionality is unknown","No request body schema or response schema is documented anywhere","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-20","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/endpoint-20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint path (/api/endpoint-20) doesn't correspond to any named service on the site. All doc pages return only 'Connect wallet' with no useful 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'/request':160 '0.02':83,159 '000':78 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':215 '1':199 '20':77 '402':196 '6':88 'Base network API' 'USDC micropayment endpoint' 'accept':60 'access':40,58 'across':117 'address':205 'advertis':115 'ai':127 'amount':75 'analysi':131 'analyt':121 'api':6,20,38,57,91 'application/json':221 'attach':102 'base':9,23,48,71,79,213 'base-network' 'beyond':223 'broader':112 'call':4,18 'caller':100 'categori':119 'challeng':194 'classif':134 'clear':169 'coin':69 'collect':32 'commit':97 'connect':236 'contract':211 'convers':151 'crypto-paid API' 'data':120,124 'decim':89 'demonstr':183 'document':222 'embed':135 'empti':229 'endpoint':7,21,39,52,116,155,165,184,186,245 'equival':81 'essenti':228 'estim':145 'exact':240 'exchang':140 'export':125 'feed':139 'financ':136 'gas':144 'generat':152 'generic':181 'geocod':149 'header':107 'host':30 'howev':162 'http':195 'infrastructur':147 'insight':126 'json-response' 'key':92 'label':55 'land':225 'learn':129 'limit':94 'list':154 'live':188 'lowpaymentfee' 'lowpaymentfee.com':29,113 'machin':128 'map':170 'maximum':74 'may':178 'metric':122 'mime':218 'name':175 'network':49 'no-api-key' 'page':226,233 'particular':164 'pay':2,16,35 'pay-per-cal':1,15 'pay-per-call API' 'pay-per-request':34 'payment':44,63,106,204 'per':3,17,36,84 'platform':114 'post':61 'post-method' 'premium':5,19,56 'premium API access' 'price':138,161 'protocol':45,202 'quot':143 'rate':93,141 'report':123 'request':37,62,85,110 'request/response':241 'requir':99 'respons':217 'return':190 'schema':242 'sentiment':130 'servic':176 'settl':12,26,65 'sever':118 'share':156 'show':235 'simpli':101 'specif':51 'sub':232 'sub-pag':231 'summar':133 'text':132 'token':142 'type':219 'unit':80 'unknown':247 'upfront':96 'usd':68 'usdc':14,28,67,86,210 'usdc-settlement' 'use':87 'util':148 'valid':150,192 'version':198 'via':10,24,41 'wallet':237 'web3':137 'x':105 'x-payment':104 'x402':11,25,43,193 'x402 API' 'x402-payment'","prices":[{"id":"d40416bc-b5ec-4ed4-b782-4b9f00f1e0b7","listingId":"7f4aa747-99d1-46d4-a54c-2277852e5bd6","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/endpoint-20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:01.820Z"}],"sources":[{"listingId":"7f4aa747-99d1-46d4-a54c-2277852e5bd6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:01.820Z","lastSeenAt":"2026-04-23T02:00:21.974Z"}],"details":{"listingId":"7f4aa747-99d1-46d4-a54c-2277852e5bd6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-20 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-20"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-20"}],"useCases":["Agent-driven API consumption where per-call USDC micropayments replace traditional API keys","Programmatic access to a premium endpoint without subscription or rate-limit overhead","Demonstrating x402 payment protocol integration on the Base L2 network"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC micropayments on Base","Projects needing keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or well-defined request/response schemas","High-volume consumers who prefer flat-rate or subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:17:34.593Z"},"updatedAt":"2026-04-23T02:00:21.974Z"}}