{"id":"e89a2f72-25eb-4f84-81f5-fedbca727782","shortId":"t2S8Sw","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/benefits/31` is labeled \"Premium API Access\" but the crawled documentation does not detail what data or functionality this particular path returns. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) on Base (asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The response MIME type is application/json. No OpenAPI schema, request body schema, or response body schema is published, so the exact input parameters and output format are unknown.\n\nThe platform's landing page lists sibling endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, the docs, pricing, and API pages behind the landing page appear to require a wallet connection and do not expose further documentation in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key"],"categories":["general","api-marketplace"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The exact functionality of /api/v1/benefits/31 ('Premium API Access') is not documented anywhere in the crawled material.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/docs, /pricing, /api, /README) all returned only 'Connect wallet' with no usable content.","The platform lists many endpoints but none have detailed documentation visible without wallet connection."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/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/v1/benefits/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 challenge, but the specific functionality of /api/v1/benefits/31 is undocumented. No request or response schema is available, and the docs/pricing/API pages are gated behind wallet connection with no crawlable content. This is effectively a stub 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'/request':13,28 '0.02':12,27,82,152,224 '000':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':158 '20':146 'Base network API' 'USDC micropayment API' 'accept':136 'access':7,22,38,112 'ai':69 'analysi':202 'analyt':68 'api':6,21,37,65,94,111,232 'appear':238 'application/json':164 'asset':156 'base':9,24,90,148,155 'behind':234 'bodi':169,173 'broad':58 'call':4,19 'catalog':59 'challeng':130 'classif':205 'commit':102 'confirm':131 'connect':243 'contract':157 'convers':217 'crawl':115,252 'data':67,121,198 'detail':119 'doc':229 'document':116,249 'embed':206 'endpoint':32,49,78,106,133,194 'estim':214 'exact':179 'exchang':209 'export':199 'expos':247 'feed':208 'financ':72 'format':184 'function':123 'gas':213 'generat':219 'geocod':215 'host':56 'howev':227 'infrastructur':75 'input':180 'insight':200 'json-response' 'key':95 'label':109 'land':190,236 'learn':71 'limit':98 'list':192 'live':135 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':70 'mani':48 'metric':196 'mime':161 'minimum':101 'network':91 'no-api-key' 'offer':50 'one':46 'openapi':166 'output':183 'page':191,233,237 'paramet':181 'particular':125 'path':126 'pay':2,17,62 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':61 'payment':42,142 'per':3,18,63,83 'platform':54,188 'point':226 'post':137 'premium':5,20,36,110 'premium API' 'price':80,207,225,230 'protocol':43 'provid':35 'publish':176 'quot':212 'rate':97,210 'report':197 'request':64,84,138,168 'requir':103,140,240 'respons':160,172 'return':127 'schema':167,170,174 'sentiment':201 'settl':85 'sibl':193 'span':66 'specif':105 'summar':204 'text':203 'token':211 'type':162 'unit':149 'unknown':186 'usd':153 'usdc':15,30,87,151 'usdc-base' 'util':76 'valid':216 'via':10,25,39 'wallet':242 'web3':73 'x402':11,26,41,129 'x402 API' 'x402-payment'","prices":[{"id":"679cd644-1f01-47f4-b7d4-ece423ffc005","listingId":"e89a2f72-25eb-4f84-81f5-fedbca727782","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/benefits/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":"2026-04-18T19:59:43.461Z"}],"sources":[{"listingId":"e89a2f72-25eb-4f84-81f5-fedbca727782","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:43.461Z","lastSeenAt":"2026-04-22T05:31:54.188Z"}],"details":{"listingId":"e89a2f72-25eb-4f84-81f5-fedbca727782","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/31 \\\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":"Endpoint returns 402 with x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/31"},{"claim":"All endpoints 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/31"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Exploring a multi-category API marketplace with uniform low pricing"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Users who need low-cost, no-commitment API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet or x402 client","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.014Z"},"updatedAt":"2026-04-22T05:31:54.188Z"}}