{"id":"d62f358f-4bd5-429c-afa4-dc86a322fa9b","shortId":"dUX8TS","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 — all gated via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/policies/58` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The platform advertises a uniform $0.02 per request pricing model with no API keys, no rate limits, and instant access.\n\nPayment is settled in USDC (contract 0x8335…2913) on Base. The x402 challenge confirms a maxAmountRequired of 20,000 base units, which at 6 decimals equals $0.02 — consistent with the site's advertised pricing. The endpoint accepts POST requests and returns application/json. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.\n\nWithout documentation on what this specific policy endpoint returns or what input it expects, agents will need to experiment or rely on the generic \"Premium API Access\" label. The platform appears live and the x402 challenge is well-formed, but the lack of any schema or usage documentation significantly limits discoverability and usability.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","paid API access","x402 API","USDC API","Base network API","lowpaymentfee","micropayment API","pay-per-call API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema for this endpoint","The exact purpose of /api/v1/policies/58 ('Premium API Access') is undefined beyond its label","Cannot determine what input the POST endpoint expects or what it returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/58","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/58","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 pricing is $0.02 USDC on Base. However, there is zero documentation on what this specific endpoint does, no request/response schema, and all doc pages render only 'Connect wallet'. The listing is effectively a 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'0.02':10,24,89,130 '000':122 '0x8335':110 '20':121 '2913':111 '6':127 'Base network API' 'USDC API' 'accept':140 'access':6,20,73,103,207 'across':45 'advertis':86,136 'agent':195 'ai/ml':48 'analyt':47 'api':5,19,44,72,96,165,206 'appear':211 'application/json':145 'base':8,22,62,113,123 'base-network' 'beyond':81,158 'broader':37 'categori':52 'challeng':116,216 'confirm':117 'connect':174 'consist':131 'content':180 'contract':109 'data':46 'decim':128 'discover':232 'doc':164 'document':80,157,182,229 'endpoint':30,66,139,188 'equal':129 'exact':76 'exampl':154 'expect':194 'experi':199 'finance/web3':49 'form':220 'function':77 'gate':3,17,54 'generic':204 'howev':146 'infrastructur':51 'input':192 'instant':102 'json-response' 'key':97 'label':83,208 'lack':223 'land':160 'limit':100,231 'list':69,162 'live':212 'lowpaymentfee' 'lowpaymentfee.com':32 'maxamountrequir':119 'micropayment API' 'model':93 'need':197 'network':63 'no-api-key' 'offer':39 'openapi':150 'page':161,169 'paid API access' 'part':34 'pay':9,23,41 'pay-per-call API' 'pay-per-request':40 'payment':58,104 'per':11,25,42,90 'platform':38,85,210 'polici':187 'post':141 'post-method' 'premium':4,18,71,205 'premium API' 'price':92,137,166 'prompt':176 'protocol':59 'rate':99 'readm':168 'reli':201 'render':171 'request':12,26,43,91,142 'request/response':153 'return':144,189 'schema':151,226 'settl':106 'signific':230 'site':134 'specif':65,186 'substant':179 'uniform':88 'unit':124 'usabl':234 'usag':228 'usdc':14,28,108 'usdc-settlement' 'via':55 'wallet':175 'well':219 'well-form':218 'without':181 'x402':2,16,57,115,215 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"36d2ef6b-38d3-4db0-b134-18872aae0deb","listingId":"d62f358f-4bd5-429c-afa4-dc86a322fa9b","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:05.657Z"}],"sources":[{"listingId":"d62f358f-4bd5-429c-afa4-dc86a322fa9b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:05.657Z","lastSeenAt":"2026-04-23T06:31:18.694Z"}],"details":{"listingId":"d62f358f-4bd5-429c-afa4-dc86a322fa9b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/58 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/58"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/58"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating x402-gated services into agent workflows without API key management","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol on Base","Agents needing keyless, pay-per-request API access","Low-volume consumers who prefer no subscriptions or commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.214Z"},"updatedAt":"2026-04-23T06:31:18.694Z"}}