{"id":"17551159-1494-4b2b-91db-b0ae5dcfa855","shortId":"FgwjNY","kind":"x402","title":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated API key endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-request API endpoints spanning data & analytics, AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/89` is live and returns a valid x402 challenge (HTTP 402) with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the specified payTo address. The platform advertises no API keys required, no rate limits, and instant access — the x402 payment header serves as the sole authentication mechanism.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint returns. The endpoint path (`/api/v1/apikeys/89`) suggests it may provision or return an API key, but this is speculative. Without documentation or sample responses, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-provisioning","no-rate-limits"],"categories":["infrastructure","api-access"],"synonyms":["premium API access","x402 API key","pay-per-call API","USDC API payment","Base network API","micropayment API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or output schema provided; actual response format is unknown","The endpoint path '/api/v1/apikeys/89' is ambiguous — it is unclear what 'apikeys/89' returns or whether it provisions a key","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/89","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/apikeys/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no explanation of what the endpoint actually returns. The endpoint path and description are vague ('Premium API Access'). Pricing is clear ($0.02 USDC on Base), but the lack of any schema or behavioral documentation makes this a near-stub 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'0.02':10,24,94,136 '000':123 '0x8335':128 '20':122 '2913':129 '402':117 '6':132 'Base network API' 'USDC API payment' 'access':36,162 'actual':236 'address':149 'advertis':152 'ai':63 'analysi':67 'analyt':62 'api':4,18,35,58,154,179,224 'api-key-provisioning' 'authent':171 'base':8,22,102,124,131 'behavior':237 'broader':47 'challeng':115 'classif':70 'connect':188 'content':194 'convers':87 'data':61 'decim':133 'doc':178 'document':173,203,231 'embed':71 'endpoint':6,20,30,59,90,106,211,214,240 'equal':135 'estim':81 'exact':143 'exampl':206 'exchang':76 'extrem':175 'feed':75 'financ':72 'gas':80 'gate':3,17 'generat':88 'geocod':85 'header':166 'http':116 'infrastructur':83 'instant':161 'key':5,19,155,225 'learn':65 'limit':159 'live':109 'lowpaymentfee.com':32 'machin':64 'made':139 'maxamountrequir':120 'may':219 'mechan':172 'micropayment API' 'network':103 'no-rate-limits' 'offer':50 'openapi':198 'page':183 'part':44 'particular':210 'path':215 'pay':9,23,55 'pay-per-call API' 'pay-per-request':54 'payment':40,137,165 'payto':148 'per':13,27,56,95 'platform':48,151 'premium':34 'premium API access' 'price':74,92,180 'prompt':190 'protocol':41 'provid':33 'provis':220 'quot':79 'rate':77,158 'readm':182 'remain':241 'render':185 'request':14,28,57,96 'request/response':201 'requir':156 'respons':234 'return':111,212,222 'sampl':233 'schema':202 'scheme':144 'sentiment':66 'serv':167 'settl':97 'sole':170 'span':60 'spars':176 'spec':199 'specif':105 'specifi':147 'specul':229 'substant':193 'suggest':217 'summar':69 'text':68 'token':78 'unclear':242 'unit':125 'usdc':12,26,99,127 'usdc-base' 'util':84 'valid':86,113 'varieti':52 'via':37,140 'wallet':189 'web3':73 'without':230 'x402':2,16,39,114,142,164 'x402 API key' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"de17f623-232e-4528-919c-e856e1ff2194","listingId":"17551159-1494-4b2b-91db-b0ae5dcfa855","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/apikeys/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:37.381Z"}],"sources":[{"listingId":"17551159-1494-4b2b-91db-b0ae5dcfa855","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:37.381Z","lastSeenAt":"2026-04-23T05:01:54.821Z"}],"details":{"listingId":"17551159-1494-4b2b-91db-b0ae5dcfa855","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/89 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge, maxAmountRequired 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/89"},{"claim":"Platform lists endpoints at $0.02/request across data, AI, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/89"}],"useCases":["Acquiring API access credentials via a single micropayment","Programmatic pay-per-use API consumption without subscription","Agent-driven API key provisioning on Base network"],"bestFor":["Developers wanting no-subscription API access with crypto micropayments","AI agents that need to autonomously purchase API keys","Users on the Base L2 network who hold USDC"],"notFor":["Users who need detailed API documentation before purchasing","Anyone without USDC on Base network","High-volume consumers who prefer flat-rate pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.812Z"},"updatedAt":"2026-04-23T05:01:54.821Z"}}