{"id":"36945912-97bc-4113-88c7-26cd2c16455c","shortId":"hDAvea","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/142` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, no rate limits. You send a POST request with an `X-PAYMENT` header containing a signed payment proof, and the endpoint returns its response.\n\nThe broader platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), 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 listed at the same $0.02/request price point. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is the canonical Base USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nNote: The specific `/api/v1/messages/142` endpoint's purpose is unclear — the name \"Premium API Access\" is generic and no documentation, request schema, or response schema is provided beyond the x402 challenge. The crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail. Treat this endpoint as live but under-documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["general","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API gateway","402 payment API"],"warnings":["No request or response schema available — the endpoint's actual functionality is unknown","The endpoint path '/api/v1/messages/142' does not match any of the documented API categories on the landing page","Docs, pricing, and README pages all returned only a 'Connect wallet' prompt with no usable content","No SLA, rate-limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/142","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/messages/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific endpoint's purpose ('Premium API Access' at /api/v1/messages/142) is entirely opaque. This is effectively a stub 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'/request':19,38,177 '0.02':18,37,80,176 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':185 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':196 '20':83 '402 payment API' '6':90 'Base network API' 'USDC micropayment API' 'access':75,210 'addit':242 'address':183 'advertis':132 'ai':12,31,143 'analysi':147 'analyt':137 'api':5,24,45,74,100,209 'asset':189 'base':8,27,63,85,194 'beyond':223 'broad':50 'broader':130 'call':4,23,82 'canon':193 'catalog':51 'categori':135 'challeng':226 'classif':150 'connect':238 'contain':118 'contract':190 'convers':167 'cost':77 'cover':10,29 'crawl':228 'crypto API gateway' 'data':11,30,136,140 'decim':91 'detail':243 'doc':229 'document':215,252 'embed':151 'enabl':44 'endpoint':16,35,57,67,125,134,170,201,246 'estim':161 'exchang':156 'export':141 'feed':155 'financ':13,32,152 'four':133 'gas':160 'generat':168 'generic':212 'geocod':165 'handl':94 'header':117 'infrastructur':163 'insight':142 'key':101 'learn':145 'limit':106 'list':71,172 'live':248 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':144 'metric':138 'name':207 'network':64 'no-api-key' 'no-rate-limit' 'note':197 'offer':48 'page':232 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,116,121,181 'per':3,22,55,81 'platform':6,25,46,131 'point':179 'post':110 'post-endpoint' 'premium':73,208 'price':154,178,231 'prompt':239 'proof':122 'protocol':98 'provid':222 'purpos':203 'quot':159 'rate':105,157 'recipi':182 'report':139 'request':56,111,216 'respons':128,219 'return':126,233 'schema':217,220 'send':108 'sentiment':146 'settl':58 'sign':120 'specif':66,199 'subscript':103 'summar':149 'text':148 'token':158 'treat':244 'unclear':205 'under-docu':250 'unit':86 'usdc':9,28,60,88,188,195 'usdc-base' 'util':15,34,164 'valid':166 'via':95 'wallet':237 'wallet-connect':236 'web3':153 'x':115 'x-payment':114 'x402':43,97,225 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d7db9cf9-c009-4005-9e72-f4e64c189ad2","listingId":"36945912-97bc-4113-88c7-26cd2c16455c","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/messages/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.115Z"}],"sources":[{"listingId":"36945912-97bc-4113-88c7-26cd2c16455c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.115Z","lastSeenAt":"2026-04-22T02:32:06.362Z"}],"details":{"listingId":"36945912-97bc-4113-88c7-26cd2c16455c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/142 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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 up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/142"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/142"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without signing up for an account or managing API keys","Making one-off paid API calls from autonomous agents using on-chain USDC payments","Integrating pay-as-you-go endpoints into workflows that need data, AI inference, or utility services"],"bestFor":["Agents and developers who want zero-signup, pay-per-call API access","Use cases requiring micropayments ($0.02) settled on Base L2","Scenarios where API-key management overhead is undesirable"],"notFor":["High-volume use cases where per-request costs add up (no bulk discounts documented)","Users who need detailed API documentation, request/response schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.541Z"},"updatedAt":"2026-04-22T02:32:06.362Z"}}