{"id":"1136dff5-833d-42dd-aed0-be46169fc779","shortId":"KgMbAS","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":"lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The `/api/v3/admin` endpoint is labeled \"Premium API Access\" and requires a USDC payment of up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are needed — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 `/api/v3/admin` endpoint's functionality is not documented beyond the label \"Premium API Access,\" so its exact capabilities are unclear.\n\nPayment settles in USDC (contract 0x8335…2913) on Base to address 0x1A2B…85F3, with a 300-second timeout. The endpoint accepts POST requests and returns application/json. Documentation pages (/docs, /pricing, /README) all resolve but display only a \"Connect wallet\" prompt, providing no further technical detail about request/response schemas or endpoint behavior.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","premium API"],"warnings":["The exact functionality of /api/v3/admin is not documented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /README, /api) render only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, request schema, or response schema is available.","The relationship between /api/v3/admin and the other advertised v1/v2 endpoints is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v3/admin","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/v3/admin","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The actual functionality behind 'Premium API Access' at /api/v3/admin is undocumented, making this effectively a stub 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'/docs':203 '/pricing':204 '/readme':205 '/request':13,28,151 '0.02':12,27,67,150 '000':71 '0x1a2b':186 '0x8335':180 '20':70 '2913':181 '300':190 '6':77 '85f3':187 'Base network API' 'USDC API access' 'accept':195 'access':7,22,41,58,168 'across':108 'address':185 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':6,21,40,57,80,167 'application/json':200 'attach':91 'base':9,24,49,72,183 'behavior':225 'beyond':163 'broader':104 'call':4,19,69 'caller':89 'capabl':172 'categori':110 'classif':125 'commit':86 'connect':212 'contract':179 'convers':142 'data':111,115 'decim':78 'detail':219 'display':209 'document':162,201 'embed':126 'endpoint':53,107,146,157,194,224 'estim':136 'exact':171 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':159 'gas':135 'generat':143 'geocod':140 'header':96 'howev':153 'infrastructur':138 'insight':117 'json-api' 'key':81 'label':55,165 'learn':120 'limit':83 'list':145 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'need':88 'network':50 'no-api-key' 'no-rate-limit' 'offer':32 'page':202 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':45,63,95,101,175 'per':3,18,38,68 'platform':105 'post':196 'post-method' 'premium':5,20,56,166 'premium API' 'price':129,152 'prompt':214 'proof':102 'protocol':46 'provid':215 'quot':134 'rate':82,132 'report':114 'request':39,197 'request/response':221 'requir':60 'resolv':207 'return':199 'schema':222 'second':191 'sentiment':121 'settl':176 'share':147 'simpli':90 'specif':155 'suit':34 'summar':124 'technic':218 'text':123 'timeout':192 'token':133 'unclear':174 'unit':73 'upfront':85 'usdc':15,30,62,75,178 'usdc-base' 'util':139 'valid':99,141 'via':10,25,42 'wallet':213 'web3':128 'x':94 'x-payment':93 'x402':11,26,44,100 'x402 API' 'x402-payment'","prices":[{"id":"899c5402-b6fd-41c3-9604-0184155e005b","listingId":"1136dff5-833d-42dd-aed0-be46169fc779","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/v3/admin","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:15.616Z"}],"sources":[{"listingId":"1136dff5-833d-42dd-aed0-be46169fc779","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v3/admin","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:15.616Z","lastSeenAt":"2026-04-24T13:31:33.994Z"}],"details":{"listingId":"1136dff5-833d-42dd-aed0-be46169fc779","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v3/admin \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","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 requiring USDC payment on Base with maxAmountRequired of 20000 base units (=$0.02)","source_url":"https://lowpaymentfee.com/api/v3/admin"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v3/admin"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages display only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic access to data, AI, finance, or utility endpoints with instant crypto settlement"],"bestFor":["Developers or agents wanting keyless, pay-as-you-go API access","x402-compatible clients on the Base network","Low-friction micropayment API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer subscription-based pricing","Callers who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.263Z"},"updatedAt":"2026-04-24T13:31:33.994Z"}}