{"id":"baaefae9-ed07-4f45-988b-3077cb3693cb","shortId":"VPr4Wr","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request 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/policies/61` is labeled \"Premium API Access\" and is gated via the x402 protocol on the Base network. Payment is in USDC (contract 0x8335…2913) at a maximum cost of 0.02 USDC per request (20,000 base units with 6 decimals). No API keys, rate limits, or commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform advertises a wide catalog of endpoints including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific functionality behind `/api/v1/policies/61` (\"Premium API Access\") is not documented beyond its title. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nThe endpoint is confirmed live: it returns a well-formed x402 402 challenge with version 1, accepting POST requests. Settlement occurs on Base mainnet to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","premium-api-access"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium access endpoint","402 payment API"],"warnings":["The exact functionality behind /api/v1/policies/61 ('Premium API Access') is not documented anywhere in the crawl.","All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema available — callers cannot know what to send or expect back.","The platform lists many endpoints but none have detailed documentation visible without wallet connection."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/61","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/policies/61","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, but the specific functionality of /api/v1/policies/61 is completely undocumented. No OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The listing is effectively a stub with confirmed 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'/request':157 '0.02':10,24,85,156 '000':90 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':233 '0x8335':78 '1':222 '20':89 '2913':79 '300':236 '402':218 '402 payment API' '6':94 'Base network API' 'USDC micropayment API' 'accept':223 'access':6,20,61,168 'across':45 'address':232 'advertis':121 'ai/ml':48 'analysi':134 'analyt':47 'api':5,19,44,60,97,167,190 'attach':107 'base':8,22,71,91,229 'base-network' 'behind':164 'beyond':172 'broader':37 'caller':105 'catalog':124 'categori':52 'challeng':219 'classif':137 'commit':102 'confirm':209 'connect':199 'content':205 'contract':77 'convers':149 'cost':83 'crawl':187 'data':46,130 'decim':95 'detail':181 'doc':189 'document':171,182 'embed':138 'endpoint':30,55,126,207 'estim':146 'exampl':179 'exchang':141 'export':131 'feed':140 'finance/web3':49 'form':216 'found':184 'function':163 'gas':145 'gate':3,17,64 'generat':151 'geocod':147 'header':112 'howev':160 'includ':127 'infrastructur':51 'insight':132 'key':98 'label':58 'limit':100 'live':210 'low payment fee' 'lowpaymentfee.com':32 'mainnet':230 'maximum':82 'metric':128 'network':72 'no-api-key' 'occur':227 'offer':39 'openapi':176 'page':194 'part':34 'pay':9,23,41 'pay-per-call API' 'pay-per-request':40 'payment':73,111,117 'per':11,25,42,87 'platform':38,120 'point':159 'post':224 'premium':4,18,59,166 'premium access endpoint' 'premium-api-access' 'price':139,158,191 'prompt':201 'proof':118 'protocol':68 'quot':144 'rate':99,142 'readm':193 'report':129 'request':12,26,43,88,225 'request/response':178 'requir':104 'return':196,212 'schema':177 'second':237 'sentiment':133 'settlement':226 'simpli':106 'specif':54,162 'substant':204 'summar':136 'text':135 'timeout':238 'titl':174 'token':143 'unit':92 'usdc':14,28,76,86 'usdc-settlement' 'valid':115,148 'version':221 'via':65 'wallet':200 'well':215 'well-form':214 'wide':123 'x':110 'x-payment':109 'x402':2,16,67,116,217 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"87ec6ad0-0f04-4ea5-9fe2-df224038d058","listingId":"baaefae9-ed07-4f45-988b-3077cb3693cb","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/policies/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:00.823Z"}],"sources":[{"listingId":"baaefae9-ed07-4f45-988b-3077cb3693cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:00.823Z","lastSeenAt":"2026-04-23T06:31:18.501Z"}],"details":{"listingId":"baaefae9-ed07-4f45-988b-3077cb3693cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/61 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/61"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/61"},{"claim":"Platform offers endpoints across data & analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API features with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to gated resources"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already on the Base network with USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.476Z"},"updatedAt":"2026-04-23T06:31:18.501Z"}}