{"id":"830d074a-c56d-4d61-a241-c83da1d51a3d","shortId":"QNHfLB","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 specific resource `/api/v1/item/49` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3. The maxAmountRequired of 20000 base units (USDC has 6 decimals) translates to $0.02 per call, consistent with the site's advertised pricing. The response MIME type is application/json.\n\nHowever, the specific functionality of `/api/v1/item/49` is unclear. It does not correspond to any of the named endpoints listed on the site's landing page (which include analytics, AI, finance, and utility routes). No OpenAPI spec, request/response schemas, or detailed documentation were found — the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this particular item endpoint returns, callers should treat this as an opaque premium resource.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","misc"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","premium api access","low fee api"],"warnings":["The specific resource /api/v1/item/49 is not listed among the named endpoints on the site — its purpose is unknown.","No OpenAPI specification or request/response schema is available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no content.","Functionality must be inferred; callers cannot know what this endpoint returns without trial."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/49","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/item/49","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 with clear pricing, but the specific functionality of /api/v1/item/49 is undocumented. No OpenAPI spec, no request/response schema, and no meaningful documentation pages were found. The item ID doesn't map to any named endpoint on the landing 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'/request':13,28 '0.02':12,27,76,132 '0x1a2b':118 '0x8335':112 '20000':123 '2913':113 '6':128 '85f3':119 'USDC micropayment api' 'accept':103 'access':7,22,38 'address':117 'advertis':140 'ai':63,176 'analyt':62,175 'api':6,21,37,88 'application/json':147 'base':9,24,84,115,124 'base network api' 'base-network' 'call':4,19,134 'caller':216 'categori':59 'challeng':97 'commit':93 'confirm':98 'connect':201 'consist':135 'content':207 'contract':111 'correspond':159 'data':61 'decim':129 'detail':187 'doc':192 'document':188 'endpoint':32,52,72,100,165,214 'financ':66,177 'found':190 'function':151 'howev':148 'includ':60,174 'infrastructur':69 'item':213 'json-response' 'key':89 'know':209 'land':171 'learn':65 'limit':91 'list':166 'live':102 'low fee api' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':64 'mani':51 'maxamountrequir':121 'mime':144 'name':164 'network':85 'no-api-key' 'offer':53 'one':49 'opaqu':222 'openapi':182 'page':172,196 'particular':212 'pay':2,17 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request' 'payabl':79 'payment':42,108 'per':3,18,77,133 'platform':56 'post':104 'post-method' 'premium':5,20,36,223 'premium api access' 'price':74,141,193 'prompt':203 'protocol':43 'provid':35 'rate':90 'readm':195 'request':78,105 'request/response':184 'requir':94 'resourc':46,224 'respons':143 'return':198,215 'rout':180 'schema':185 'settl':107 'site':138,169 'span':58 'spec':183 'specif':45,150 'substant':206 'translat':130 'treat':218 'type':145 'unclear':155 'unit':125 'usdc':15,30,81,110,126 'usdc-settlement' 'util':70,179 'via':10,25,39 'wallet':202 'web3':67 'without':208 'x402':11,26,41,96 'x402 api' 'x402-payment'","prices":[{"id":"128b4b5c-1444-4d58-87ca-8fe3883fd559","listingId":"830d074a-c56d-4d61-a241-c83da1d51a3d","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/item/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:34.565Z"}],"sources":[{"listingId":"830d074a-c56d-4d61-a241-c83da1d51a3d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:34.565Z","lastSeenAt":"2026-04-22T11:31:11.369Z"}],"details":{"listingId":"830d074a-c56d-4d61-a241-c83da1d51a3d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/49 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","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/item/49"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/item/49"},{"claim":"Categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium resource with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-as-you-go API access","Low-volume callers who want no subscription commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","High-volume consumers seeking bulk pricing or rate-limit guarantees","Anyone requiring a non-crypto payment method"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.475Z"},"updatedAt":"2026-04-22T11:31:11.369Z"}}