{"id":"a83f6dc3-2eb5-4f4e-91c4-9e70abf32b95","shortId":"PSbjjf","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/22` 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 per request (20,000 base units with 6 decimals). No API keys or rate limits are advertised; access is granted immediately upon payment.\n\nThe platform lists numerous sibling endpoints covering sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02/request price point. However, the specific functionality behind `/api/v1/policies/22` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause the endpoint is live (returns a valid 402 challenge) but its actual behavior, input parameters, and response format are entirely undocumented, agents should treat this as a discoverable but opaque endpoint. The x402 challenge confirms it accepts POST requests and returns application/json.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","paid API access","x402 endpoint","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The specific functionality of /api/v1/policies/22 ('Premium API Access') is completely undocumented — no description of inputs, outputs, or purpose beyond the title.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No OpenAPI schema or request/response examples are available.","The platform lists many endpoints but none appear to have public documentation of their behavior."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/22","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/22","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 402 challenge, confirming pricing and network details. However, there is zero documentation on what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/request':140 '0.02':10,24,86,139 '000':90 '0x8335':79 '20':89 '2913':80 '402':192 '6':94 'Base network API' 'USDC API' 'accept':221 'access':6,20,62,104,151 'across':45 'actual':196 'addit':182 'advertis':103 'agent':206 'ai/ml':48 'analysi':118 'analyt':47 'api':5,19,44,61,97,150,171 'application/json':226 'base':8,22,72,91 'base-network' 'behavior':197 'behind':147 'beyond':155 'broader':37 'categori':53 'challeng':193,218 'classif':121 'confirm':219 'connect':177 'content':183 'contract':78 'convers':131 'cost':84 'cover':116 'data':46,133 'decim':95 'discover':212 'doc':168 'document':154 'embed':122 'endpoint':30,56,115,186,215 'entir':204 'estim':128 'exampl':165 'exchang':125 'export':134 'feed':124 'financ':49 'format':202 'function':146 'gas':127 'gate':3,17,65 'geocod':129 'grant':106 'howev':143 'immedi':107 'infrastructur':52 'input':198 'json-response' 'key':98 'label':59 'limit':101 'list':112 'live':188 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':83 'micropayment API' 'network':73 'numer':113 'offer':39 'opaqu':214 'openapi':161 'page':172 'paid API access' 'paramet':199 'part':34 'pay':9,23,41 'pay-per-request':40 'payment':74,109 'per':11,25,42,87 'platform':38,111 'point':142 'post':222 'post-method' 'premium':4,18,60,149 'premium API' 'price':123,141,169 'prompt':179 'protocol':69 'rate':100,126 'render':174 'request':12,26,43,88,223 'request/response':164 'respons':201 'return':189,225 'schema':162 'sentiment':117 'sibl':114 'specif':55,145 'summar':120 'text':119 'titl':157 'treat':208 'undocu':205 'unit':92 'upon':108 'usdc':14,28,77 'usdc-payment' 'valid':130,191 'via':66 'wallet':178 'web3':50 'x402':2,16,68,217 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3cd5cb05-86ff-4ea1-bab7-3af121599246","listingId":"a83f6dc3-2eb5-4f4e-91c4-9e70abf32b95","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:52.330Z"}],"sources":[{"listingId":"a83f6dc3-2eb5-4f4e-91c4-9e70abf32b95","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:52.330Z","lastSeenAt":"2026-04-23T08:01:37.288Z"}],"details":{"listingId":"a83f6dc3-2eb5-4f4e-91c4-9e70abf32b95","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/22 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/22"},{"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 network","source_url":"https://lowpaymentfee.com/api/v1/policies/22"},{"claim":"Platform lists endpoints across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Programmatic agent-driven API consumption with crypto micropayments","Exploring x402-gated endpoints on the Base L2 network"],"bestFor":["Agents or developers wanting keyless, pay-as-you-go API access","x402-compatible wallets and clients on Base","Low-cost per-request API consumption without rate limits"],"notFor":["Users who need detailed API documentation or schemas before calling","High-volume use cases where per-request pricing may add up","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.914Z"},"updatedAt":"2026-04-23T08:01:37.288Z"}}