{"id":"757c224d-7320-466b-9919-8d0cb2624da9","shortId":"8fTXc3","kind":"x402","title":"Pay-per-call API key generation on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call API key generation on Base via x402, settled in USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/apikeys/98` is labeled \"Premium API Access\" and accepts POST requests with an x402 payment header. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, subscriptions, or rate limits are required — each call is individually paid for at the protocol level.\n\nThe broader 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, the specific endpoint being listed here (`/api/v1/apikeys/98`) is described only as \"Premium API Access\" — its exact functionality beyond that label is not documented in the crawled material.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. Documentation pages on the site (/docs, /pricing, /api, /README) all returned minimal content (just a \"Connect wallet\" prompt), so detailed request/response schemas, parameter descriptions, and usage examples are unavailable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key-required","no-rate-limits"],"categories":["api-access","infrastructure"],"synonyms":["premium API access","x402 API","pay-per-call API","USDC API payment","Base network API","micropayment API","lowpaymentfee"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) returned no useful content — only a 'Connect wallet' prompt.","The exact functionality of /api/v1/apikeys/98 ('Premium API Access') is undocumented; it is unclear what data or service is returned upon successful payment.","No request body schema or response schema is available; integration requires trial-and-error or contacting the provider."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/98","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/apikeys/98","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 documentation pages are effectively empty ('Connect wallet' only). There is no OpenAPI spec, no request/response schema, and no description of what 'Premium API Access' actually returns. The listing is largely a stub with pricing and protocol details 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'/api/v1/apikeys/98':60,179 '/docs':223 '/pricing':224 '/readme':226 '/request':17,34,170 '0.02':16,33,96,169 '000':91 '0x8335':81 '1':214 '20':90 '2913':82 '402':211 '6':101 'Base network API' 'USDC API payment' 'accept':67 'access':46,65,186 'across':127 'advertis':125 'ai':137 'amount':88 'analysi':141 'analyt':131 'api':5,22,44,64,104,185 'base':9,26,54,84,92 'base-network' 'beyond':190 'broader':123 'call':4,21,98,113 'categori':129 'challeng':209 'classif':144 'collect':38 'connect':233 'content':230 'contract':80 'convers':161 'crawl':198 'data':130,134 'decim':102 'describ':181 'descript':241 'detail':237 'document':195,218 'embed':145 'endpoint':45,58,126,165,175,201 'equal':95 'estim':155 'exact':188 'exampl':244 'exchang':150 'export':135 'feed':149 'financ':146 'four':128 'function':189 'gas':154 'generat':7,24,162 'geocod':159 'header':74 'host':36 'howev':172 'http':210 'individu':115 'infrastructur':157 'insight':136 'key':6,23,105 'label':62,192 'learn':139 'level':121 'limit':109 'list':164,177 'live':203 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':138 'materi':199 'maximum':87 'metric':132 'micropayment API' 'minim':229 'network':55 'no-api-key-required' 'no-rate-limits' 'page':219 'paid':116 'paramet':240 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':50,73,75 'per':3,20,42,97 'platform':124 'post':68 'premium':63,184 'premium API access' 'price':148,171 'prompt':235 'protocol':51,120,217 'quot':153 'rate':108,151 'report':133 'request':43,69 'request/response':238 'requir':111 'return':205,228 'schema':239 'sentiment':140 'settl':12,29,77 'share':166 'site':222 'specif':57,174 'subscript':106 'summar':143 'text':142 'token':152 'unavail':246 'unit':93 'usag':243 'usdc':14,31,79,99 'usdc-settlement' 'use':100 'util':158 'valid':160,207 'version':213 'via':10,27,47 'wallet':234 'web3':147 'x402':11,28,49,72,208 'x402 API' 'x402-payment'","prices":[{"id":"d8bc13fe-289e-4946-8524-1b063b2a5421","listingId":"757c224d-7320-466b-9919-8d0cb2624da9","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/apikeys/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:37.966Z"}],"sources":[{"listingId":"757c224d-7320-466b-9919-8d0cb2624da9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:37.966Z","lastSeenAt":"2026-04-23T05:01:54.842Z"}],"details":{"listingId":"757c224d-7320-466b-9919-8d0cb2624da9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/98 \\\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 HTTP 402 with x402 version 1 challenge advertising USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/98"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/apikeys/98"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/98"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring premium API access tokens via a single micropayment","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["AI agents needing instant, keyless API access on Base","Developers who want per-call billing without subscriptions","x402-compatible clients looking for low-cost endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.806Z"},"updatedAt":"2026-04-23T05:01:54.842Z"}}