{"id":"155fae27-6500-43ad-a67f-f541b8dbefdf","shortId":"E8PZrS","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. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/keys/98` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are required — callers simply attach the X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is minimal: the site's landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. The exact functionality behind `/api/v1/keys/98` (labeled \"Premium API Access\") is unclear — it may provide an API key or access token, but this is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","premium-api-access","post-endpoint"],"categories":["infrastructure","api-access"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium access","USDC API payment","Base network API","pay-per-call API","micropayment API"],"warnings":["No request or response schema available — the exact functionality of /api/v1/keys/98 is undocumented","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","The purpose of 'Premium API Access' is ambiguous — it may issue API keys or tokens but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/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/keys/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request parameters, response schema, or what \"Premium API Access\" actually returns. The /api, /pricing, and /README pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/keys/98':101,216 '/pricing':197 '/readme':199 '/request':13,28 '0.02':12,27,88,131 '000':120 '0x8335':125 '20':119 '2913':126 '300':147 '6':135 'Base network API' 'USDC API payment' 'accept':109 'access':7,22,38,107,220,230 'addit':210 'advertis':115 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,106,151,219,227 'attach':160 'avail':181 'base':9,24,96,121,128 'behind':215 'broad':48 'call':4,19 'caller':158 'catalog':49 'challeng':114 'classif':64 'connect':205 'content':211 'convers':81 'data':57 'decim':136 'descript':191 'document':172,236 'embed':65 'endpoint':32,84,100,182 'equal':130 'estim':75 'exact':143,213 'exampl':194 'exchang':70 'feed':69 'financ':66 'function':214 'gas':74 'generat':82 'geocod':79 'given':132 'header':165 'host':46 'infer':60 'infrastructur':77 'key':152,228 'label':217 'land':178 'limit':155 'list':103,180 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':139 'maxamountrequir':117 'may':224 'micropayment API' 'minim':174 'network':97 'page':179,200 'paramet':190 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,137,164,170 'per':3,18,53,89 'post':110 'post-endpoint' 'premium':5,20,36,105,218 'premium-api-access' 'price':68,86,184 'prompt':207 'proof':171 'protocol':43 'provid':35,186,225 'quot':73 'rate':71,154 'request':54,90,111 'request/response':188 'requir':157 'resolv':202 'schema':189 'scheme':144 'second':148 'sentiment':61 'settl':91 'simpli':159 'site':45,176 'span':56 'specif':99 'summar':63 'timeout':149 'token':72,231 'unclear':222 'unit':122 'usag':193 'usdc':15,30,93,124,133 'usdc-base' 'util':78 'valid':80,168 'via':10,25,39,140 'wallet':206 'web3':67 'x':163 'x-payment':162 'x402':11,26,41,113,142,169 'x402 premium access' 'x402-payment'","prices":[{"id":"e1ef4ef2-ba1e-41e5-a10b-a4ee6dbf0601","listingId":"155fae27-6500-43ad-a67f-f541b8dbefdf","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/keys/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":"2026-04-21T18:32:24.318Z"}],"sources":[{"listingId":"155fae27-6500-43ad-a67f-f541b8dbefdf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.318Z","lastSeenAt":"2026-04-22T01:02:19.885Z"}],"details":{"listingId":"155fae27-6500-43ad-a67f-f541b8dbefdf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/98 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/98"}],"useCases":["Acquiring premium API access or keys via a single micropayment","Agent-driven pay-per-call API consumption without pre-registration","Programmatic access to a suite of data, AI, finance, and utility endpoints"],"bestFor":["AI agents needing instant, keyless API access via crypto micropayments","Developers who want pay-as-you-go pricing with no subscription commitments","x402-compatible clients on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.38Z"},"updatedAt":"2026-04-22T01:02:19.885Z"}}