{"id":"f1b3b899-6f74-437c-abaf-882dd30f722b","shortId":"gPm2uR","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories. The specific endpoint `/api/v1/claims/21` is labeled \"Premium API Access\" and is gated by the x402 payment protocol on the Base network. Each call costs up to 20,000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe platform advertises a wide range of sibling endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 per request price point. However, the specific functionality behind `/api/v1/claims/21` (\"Premium API Access\") is not documented beyond its title. No request body schema, response schema, or usage examples are provided in the crawled material. The docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no additional detail.\n\nThe endpoint is confirmed live: it returns a well-formed x402 402 challenge with version 1, accepting the \"exact\" payment scheme on Base. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the timeout is 300 seconds. The output schema indicates it expects HTTP POST requests and is marked as discoverable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","http-post"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-gated endpoint","premium API access"],"warnings":["The specific purpose and response format of /api/v1/claims/21 is undocumented; 'Premium API Access' is a generic label with no further detail.","All documentation pages (docs, pricing, API, README) resolve to a minimal 'Connect wallet' page with no substantive content.","No OpenAPI spec, no request body schema, and no example responses are available.","Cannot verify what data or service is actually delivered after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/21","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/claims/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, the actual functionality behind 'Premium API Access' is completely undocumented — no request/response schemas, no examples, and no explanation of what the endpoint returns. Docs pages are empty beyond a wallet-connect 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'/call':13,28 '0.02':12,27,90,143 '000':82 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':224 '0x8335':87 '1':212 '20':81 '300':229 '402':208 '6':94 'Base network API' 'USDC micropayment API' 'accept':213 'access':7,22,63,156 'across':47 'addit':194 'address':222 'advertis':115 'ai/ml':50 'analysi':124 'analyt':49 'api':6,21,46,62,104,155,182 'base':9,24,74,83,219 'base-network' 'behind':152 'beyond':160 'bodi':165 'broader':39 'call':77 'categori':54 'chain':101 'challeng':209 'classif':127 'commit':112 'confirm':199 'connect':189 'convers':135 'cost':78 'crawl':176 'crypto-gated endpoint' 'data':48,137 'decim':95 'detail':195 'discover':244 'doc':179 'document':159 'embed':128 'endpoint':32,57,121,197 'equal':89 'exact':215 'exampl':171 'exchang':131 'expect':236 'export':138 'feed':130 'finance/web3':51 'form':206 'function':151 'gate':66 'geocod':133 'given':91 'howev':148 'http':237 'http-post' 'includ':122 'indic':234 'infrastructur':53 'key':105 'label':60 'limit':108 'live':200 'lowpaymentfee' 'lowpaymentfee.com':34 'mark':242 'materi':177 'minim':188 'network':75 'no-api-key' 'offer':41 'on-chain':99 'output':232 'page':183 'part':36 'pay':2,17,43 'pay-per-call API' 'pay-per-request':1,16,42 'payment':70,96,216,221 'per':3,18,44,144 'platform':40,114 'point':147 'post':238 'premium':5,20,61,154 'premium API access' 'price':129,146,180 'prompt':191 'protocol':71 'provid':173 'rang':118 'rate':107,132 'request':4,19,45,145,164,239 'resolv':185 'respons':167 'return':202 'schema':166,168,233 'scheme':217 'second':230 'sentiment':123 'settl':98 'sibl':120 'specif':56,150 'summar':126 'text':125 'timeout':227 'titl':162 'unit':84 'upfront':111 'usag':170 'usdc':15,30,86,92 'usdc-settlement' 'valid':134 'version':211 'via':10,25 'wallet':190 'well':205 'well-form':204 'wide':117 'x402':11,26,69,207 'x402 API' 'x402-payment'","prices":[{"id":"8ab8c38e-f7a1-46c5-b9ae-f1e82050ed85","listingId":"f1b3b899-6f74-437c-abaf-882dd30f722b","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/claims/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:44.056Z"}],"sources":[{"listingId":"f1b3b899-6f74-437c-abaf-882dd30f722b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:44.056Z","lastSeenAt":"2026-04-23T21:32:04.635Z"}],"details":{"listingId":"f1b3b899-6f74-437c-abaf-882dd30f722b","quickStartSnippet":"# 1. Send a POST to discover the x402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/21\n# Returns 402 with X-Payment challenge\n# 2. Construct and attach X-PAYMENT header with signed USDC payment on Base\n# (use an x402 client library to handle payment automatically)","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/21"},{"claim":"Platform advertises $0.02 per request pricing 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/claims/21"},{"claim":"Platform offers sibling endpoints across data analytics, AI/ML, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to a claims endpoint"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.647Z"},"updatedAt":"2026-04-23T21:32:04.635Z"}}