{"id":"c1b6dcc7-2ca7-47ef-a8a4-108502916b88","shortId":"rAzWb8","kind":"x402","title":"Pay-per-call API key access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call API key access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that sells access to a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. Each request costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/apikeys/87` is labeled \"Premium API Access\" and returns a valid x402 challenge (HTTP 402) requesting payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" scheme. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail, schemas, or usage examples. Without request/response schemas or concrete documentation for any of these endpoints, it is unclear what inputs they accept or what outputs they return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-access","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No request or response schema provided for this endpoint or any other listed endpoint","Purpose of '/api/v1/apikeys/87' ('Premium API Access') is ambiguous — it may provision an API key rather than serve data directly","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/87","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/87","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 with clear pricing, but there is virtually no documentation — docs, API, pricing, and README pages all show only 'Connect wallet'. No request/response schemas, no usage examples, and no explanation of what 'Premium API Access' actually returns. This is effectively a stub 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'/request':171 '0.02':12,28,63,118,170 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '0x8335':112 '20':106 '2913':113 '300':132 '402':102 '6':116 'Base network API' 'USDC API access' 'accept':137,219 'access':7,23,43,94 'across':49 'addit':144 'address':128 'advertis':143 'ai':52 'ai-inference' 'analysi':148 'analyt':51 'api':5,21,39,76,93,181 'api-key-access' 'base':9,25,68,108,115 'broader':141 'call':4,20 'categori':59 'chain':73 'challeng':100 'classif':151 'commit':83 'concret':206 'connect':190 'convers':163 'cost':62 'data':50 'data-analytics' 'decim':117 'detail':197 'direct':126 'doc':180 'document':175,207 'embed':152 'enabl':38 'endpoint':48,87,136,145,212 'estim':160 'exact':121 'exampl':201 'exchang':155 'extrem':177 'feed':154 'financ':55 'finance-data' 'gas':159 'generat':165 'geocod':161 'howev':174 'http':101 'includ':146 'infrastructure/utility':58 'input':217 'key':6,22,77 'label':91 'learn':54 'limit':80 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':53 'micropayment API' 'network':69 'on-chain':71 'output':222 'page':185 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':104,124 'per':3,13,19,29 'platform':40,142 'point':173 'post':138 'premium':92 'price':153,172,182 'prompt':192 'quot':158 'rate':79,156 'readm':184 'render':187 'request':14,30,61,103,139 'request/response':203 'requir':84 'return':96,224 'schema':198,204 'scheme':122 'second':133 'sell':42 'sentiment':147 'settl':70 'specif':86 'summar':150 'technic':196 'text':149 'thin':178 'timeout':134 'token':157 'unclear':215 'unit':109 'usag':200 'usdc':16,32,65,111 'usdc-base' 'utility-services' 'valid':98,162 'varieti':46 'via':10,26,119 'wallet':191 'web3':56 'without':202 'x402':11,27,37,99 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"3eae492a-ff17-4d2d-b2da-6b7325895975","listingId":"c1b6dcc7-2ca7-47ef-a8a4-108502916b88","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:38.571Z"}],"sources":[{"listingId":"c1b6dcc7-2ca7-47ef-a8a4-108502916b88","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:38.571Z","lastSeenAt":"2026-04-22T10:02:37.669Z"}],"details":{"listingId":"c1b6dcc7-2ca7-47ef-a8a4-108502916b88","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/87 \\\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 HTTP 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/87"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/87"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents purchasing one-off API access without needing pre-provisioned keys","On-chain pay-per-request access to analytics, AI, or finance endpoints","Programmatic access to utility services (geocoding, validation, conversion) with crypto payment"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","Use cases requiring on-chain payment settlement on Base","Quick, low-cost API calls without account registration"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.738Z"},"updatedAt":"2026-04-22T10:02:37.669Z"}}