{"id":"318f64a7-dca2-420c-a672-c19afdb9cacf","shortId":"gJJ5CU","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API endpoint on Base via x402 — $0.02/request 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-31`) is listed as \"Premium API Access\" and accepts USDC payments at a maximum cost of $0.02 per request (20,000 base units of USDC with 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 lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-31`) does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe endpoint is live and returns a proper 402 challenge. Payment settles on the Base L2 network using USDC (contract 0x8335…2913) to address 0x1A2B…85F3. The x402 version is 1 with a maximum timeout of 300 seconds. No OpenAPI schema, detailed documentation, or example responses were found — the docs, pricing, and API pages all render only a wallet-connect prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["general","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["Endpoint path /api/endpoint-31 does not match any of the named endpoints listed on the landing page — its actual functionality is unknown.","No OpenAPI schema or detailed documentation available; docs/pricing/API pages only show a wallet-connect prompt.","No example response data available to confirm what this endpoint returns.","The site lists many endpoint categories (AI, finance, data, infrastructure) but it is unclear which, if any, this endpoint corresponds to."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-31","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-31","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 it accepts USDC on Base at $0.02/request. However, the specific endpoint path (/api/endpoint-31) doesn't match any named endpoint on the site, its actual functionality is unknown, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, and no example responses are 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'/request':13,28,156 '0.02':12,27,71,155 '000':75 '0x1a2b':209 '0x8335':205 '1':215 '20':74 '2913':206 '300':221 '402':193 '6':81 '85f3':210 'Base network API' 'USDC micropayment API' 'accept':63 'access':42,61 'across':113 'addit':249 'address':208 'advertis':111 'ai':123 'analysi':127 'analyt':117 'api':6,21,40,60,84,237 'attach':95 'base':9,24,50,76,199 'base-network' 'broader':108 'call':4,19 'caller':93 'categori':115 'challeng':194 'classif':130 'collect':34 'commit':90 'connect':245 'content':250 'contract':204 'convers':147 'correspond':166 'cost':69 'crypto-paid endpoint' 'data':116,120 'decim':82 'detail':226 'doc':234 'document':227 'embed':131 'endpoint':7,22,41,54,112,151,161,172,186 'estim':141 'exact':181 'exampl':229 'exchang':136 'export':121 'feed':135 'financ':132 'found':232 'four':114 'function':182 'gas':140 'generat':148 'geocod':145 'header':100 'host':32 'howev':158 'http-post' 'infrastructur':143 'insight':122 'key':85 'l2':200 'land':177 'learn':125 'limit':87 'list':57,150 'live':188 'lowpaymentfee' 'lowpaymentfee.com':31,109 'machin':124 'maximum':68,218 'metric':118 'name':171 'network':51,201 'no-api-key' 'openapi':224 'page':178,238 'particular':160 'path':162 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,65,99,105,195 'per':3,18,38,72 'platform':110 'premium':5,20,59 'premium API access' 'price':134,157,235 'prompt':246 'proof':106 'proper':192 'protocol':47 'quot':139 'rate':86,137 'render':240 'report':119 'request':39,73 'requir':92 'respons':230 'return':190 'schema':225 'second':222 'sentiment':126 'settl':196 'share':152 'simpli':94 'site':175 'specif':53 'summar':129 'text':128 'timeout':219 'token':138 'unclear':184 'unit':77 'upfront':89 'usdc':15,30,64,79,203 'usdc-settlement' 'use':202 'util':144 'valid':103,146 'version':213 'via':10,25,43 'wallet':244 'wallet-connect':243 'web3':133 'x':98 'x-payment':97 'x402':11,26,45,104,212 'x402 API' 'x402-payment'","prices":[{"id":"7ed51dce-953f-4e2d-9ad2-9b18aed84a85","listingId":"318f64a7-dca2-420c-a672-c19afdb9cacf","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-31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:41.730Z"}],"sources":[{"listingId":"318f64a7-dca2-420c-a672-c19afdb9cacf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:41.730Z","lastSeenAt":"2026-04-22T15:00:29.695Z"}],"details":{"listingId":"318f64a7-dca2-420c-a672-c19afdb9cacf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/endpoint-31","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-proof>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/endpoint-31"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/endpoint-31"}],"useCases":["Programmatic access to a premium API endpoint without needing API key registration","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request API consumption settled on Base"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring a specific, well-documented API capability (endpoint function is unclear)","High-volume use cases where $0.02/request adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:18:36.281Z"},"updatedAt":"2026-04-22T15:00:29.695Z"}}