{"id":"f8e867f6-09eb-460d-8e05-9a011a09c23d","shortId":"Cy9Jkn","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 platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/84` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that title. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header with each request. The x402 challenge confirms the endpoint is live, accepts POST requests, requires up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and settles to address `0x1A2B...85F3` on Base.\n\nDocumentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The platform lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, but none have documented input/output schemas in the crawled pages.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["premium API","low fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/payments/84 ('Premium API Access') is not described anywhere","No example requests or responses available from crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/84","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/payments/84","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, confirming pricing and network. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' is undefined — it could be a generic gateway or a specific service. This is effectively a stub 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'/request':13,28 '0.02':12,27,70,146 '000':140 '0x1a2b':156 '20':139 '6':150 '85f3':157 'Base network API' 'USDC API access' 'accept':133 'access':7,22,38,88,114 'address':155 'advertis':105 'ai':58 'analysi':206 'analyt':57 'api':6,21,37,87,107,166 'attach':117 'avail':194 'base':9,24,78,141,159 'beyond':100 'call':4,19 'caller':115 'categori':66 'challeng':92,127 'classif':209 'confirm':128 'connect':175 'content':181 'crawl':197,226 'data':56 'decim':151 'doc':165 'document':99,160,221 'embed':210 'endpoint':32,49,82,130,203 'exact':95 'exampl':193 'exchang':213 'extrem':162 'feed':212 'financ':61 'function':96 'geocod':215 'given':147 'header':121 'i.e':145 'infrastructur':64 'input/output':222 'instant':113 'key':108 'label':85 'learn':60 'limit':111 'list':201 'live':132 'low fee API' 'lowpaymentfee.com':34 'machin':59 'mani':48 'materi':198 'micropayment API' 'network':79 'no-api-key' 'no-rate-limit' 'none':219 'offer':50 'one':46 'openapi':185 'page':170,227 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,120 'per':3,18,71 'platform':53,104,200 'post':134 'post-endpoint' 'premium':5,20,36,86 'premium API' 'price':68,167,211 'prompt':177 'protocol':43 'provid':35 'rate':110,214 'readm':169 'render':172 'request':72,124,135 'request/response':188 'requir':136 'schema':189,223 'sentiment':205 'settl':73,153 'sibl':202 'simpli':116 'span':55 'spec':186 'specif':81 'summar':208 'text':207 'thin':163 'titl':102 'unit':142 'usag':192 'usdc':15,30,75,144,148 'usdc-base' 'util':65 'via':10,25,39 'wallet':176 'web3':62 'x402':11,26,41,91,119,126 'x402 API' 'x402-payment'","prices":[{"id":"7e051ed4-ef6a-41bd-8f4b-3ae11079afd5","listingId":"f8e867f6-09eb-460d-8e05-9a011a09c23d","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/payments/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:55.669Z"}],"sources":[{"listingId":"f8e867f6-09eb-460d-8e05-9a011a09c23d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:55.669Z","lastSeenAt":"2026-04-23T09:31:18.275Z"}],"details":{"listingId":"f8e867f6-09eb-460d-8e05-9a011a09c23d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/84 \\\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 challenge, maxAmountRequired 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/84"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/84"},{"claim":"Sibling endpoints include analytics, AI, finance, and utility categories all at $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to platform services"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-commitment, no-subscription API consumption"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume callers who prefer subscription-based pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.654Z"},"updatedAt":"2026-04-23T09:31:18.275Z"}}