{"id":"a332f963-3690-4a47-890e-14f7990e84e0","shortId":"qKLcvv","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/policies/38` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network via the x402 protocol.\n\nThe platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and no minimum commitments required. The x402 challenge confirms the endpoint is live and requests a maximum of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment timeout is 300 seconds.\n\nHowever, the specific functionality behind `/api/v1/policies/38` is not documented. The landing page lists many other endpoints (analytics, AI, finance, utilities) but does not describe this particular policies route. There is no OpenAPI spec, no request/response schema documentation, and the docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no further detail. As a result, while the endpoint is confirmed live and the pricing is clear, the actual capability and expected input/output remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","policies API"],"warnings":["The specific functionality of /api/v1/policies/38 is not documented anywhere on the site.","No OpenAPI specification or request/response schema is available.","All documentation pages (/docs, /api, /pricing, /README) resolve to a minimal 'Connect wallet' prompt with no content.","The platform lists many endpoints on its landing page but /api/v1/policies/38 is not among them — its purpose is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/policies/38 is completely undocumented — no OpenAPI spec, no request/response schema, no examples, and all doc pages are empty stubs. This is effectively a stub 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'/call':13,28 '0.02':12,27,85,123,126 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '20':117 '300':139 'Base network API' 'USDC micropayment API' 'accept':65 'access':7,22,63 'across':47,88 'actual':212 'address':131 'advertis':82 'ai':158 'ai/ml':50 'analyt':49,157 'api':6,21,46,62,94,183 'base':9,24,74,119,134 'behind':145 'broader':39 'call':128 'capabl':213 'categori':54 'challeng':106 'clear':210 'commit':102 'confirm':107,204 'connect':190 'data':48 'describ':164 'detail':196 'doc':180 'document':149,177 'endpoint':32,57,91,109,156,202 'expect':215 'financ':159 'finance/web3':51 'flat':84 'function':144 'howev':141 'i.e':125 'infrastructur':53 'input/output':216 'key':95 'label':60 'land':151 'limit':98 'list':153 'live':111,205 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':154 'maximum':115 'minim':189 'minimum':101 'network':75 'no-api-key' 'offer':41 'openapi':172 'page':152,184 'paid':129 'part':36 'particular':166 'pay':2,17,43 'pay-per-call API' 'pay-per-request':1,16,42 'payment':69,136 'per':3,18,44,86,127 'platform':40,81 'polici':167 'policies API' 'post':66 'post-endpoint' 'premium':5,20,61 'premium API' 'price':181,208 'prompt':192 'protocol':79 'rate':97 'remain':217 'request':4,19,45,67,87,113 'request/response':175 'requir':103 'resolv':186 'result':199 'rout':168 'schema':176 'second':140 'settl':68 'spec':173 'specif':56,143 'timeout':137 'unit':120 'unknown':218 'usdc':15,30,71,122,124 'usdc-base' 'util':160 'via':10,25,76 'wallet':191 'x402':11,26,78,105 'x402 endpoint' 'x402-payment'","prices":[{"id":"18a97fc8-db15-47f6-9229-010e8fe153a4","listingId":"a332f963-3690-4a47-890e-14f7990e84e0","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:55.929Z"}],"sources":[{"listingId":"a332f963-3690-4a47-890e-14f7990e84e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:55.929Z","lastSeenAt":"2026-04-23T08:01:37.424Z"}],"details":{"listingId":"a332f963-3690-4a47-890e-14f7990e84e0","quickStartSnippet":"# The endpoint requires an x402 payment header with USDC on Base.\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/38\n# 2. Parse the 402 response, construct an X-PAYMENT header\n#    with a signed USDC payment of 0.02 USDC, then retry:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/38 \\\n  -H \"X-PAYMENT: <signed-x402-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC (0.02 USDC) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/38"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/38"}],"useCases":["Accessing a premium API resource with per-request USDC micropayments on Base","Integrating x402-compatible agents that pay per call without API key management","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that need keyless, pay-as-you-go API access on Base","Projects requiring low-cost ($0.02) per-call pricing with no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based access patterns","Use cases needing a well-documented request/response contract"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.698Z"},"updatedAt":"2026-04-23T08:01:37.424Z"}}