{"id":"bb7688b4-7859-491f-a5e9-2b86f7a0c231","shortId":"dxBWtD","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall settled in USDC on the Base network. The specific resource path `/api/v1/messages/164` suggests a messages or content retrieval endpoint, though the exact payload and functionality are not documented beyond the generic \"Premium API Access\" label.\n\nThe provider's landing page advertises a broad suite of APIs spanning data & analytics, AI/ML (sentiment analysis, 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 $0.02 per request with no API keys, no rate limits, and instant access. The x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02 — consistent with the advertised pricing.\n\nThe endpoint is live and returns a valid x402 challenge on POST. However, there is no OpenAPI schema, no detailed documentation, and no example request/response bodies available. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. The specific behavior of the `/api/v1/messages/164` path — what input it expects and what it returns — is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","json-response"],"categories":["api-gateway","misc"],"synonyms":["premium API","x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee"],"warnings":["No API documentation or OpenAPI schema available","The specific functionality of /api/v1/messages/164 is undocumented — 'Premium API Access' is generic","All secondary pages (/api, /pricing, /README) returned only a 'Connect wallet' stub with no content","No example request or response bodies could be determined"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/164","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/164","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example requests or responses, and the specific purpose of /api/v1/messages/164 is unclear. The crawled pages beyond the landing page are empty 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'/api/v1/messages/164':54,212 '/pricing':191 '/readme':193 '/request':13,28 '0.02':12,27,120,156 '0x8335':149 '20000':144 '6':152 'Base network API' 'USDC API' 'access':7,22,38,76,132 'addit':205 'advertis':83,160 'ai/ml':92 'analysi':94 'analyt':91 'api':6,21,37,75,88,125 'avail':188,226 'base':9,24,48,145,151 'behavior':209 'behind':39 'beyond':71 'bodi':187 'broad':85 'call':4,19 'challeng':135,171 'classif':96 'connect':200 'consist':157 'content':59,206 'convers':113 'data':90 'decim':153 'detail':181 'document':70,182 'embed':97 'endpoint':32,61,116,139,163 'equal':155 'estim':107 'exact':64 'exampl':185 'exchang':102 'expect':217 'feed':101 'financ':98 'function':67 'gas':106 'generat':114 'generic':73 'geocod':111 'howev':174 'infrastructur':109 'input':215 'instant':131 'json-response' 'key':126 'label':77 'land':81 'limit':129 'list':118 'live':165 'lowpaymentfee' 'lowpaymentfee.com':34 'materi':227 'maxamountrequir':142 'messag':57 'micropayment API' 'minim':199 'network':49 'openapi':178 'page':82,194 'path':53,213 'pay':2,17 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request' 'payload':65 'paywal':42 'per':3,18,121 'post':173 'post-endpoint' 'premium':5,20,36,74 'premium API' 'price':100,161 'prompt':202 'provid':35,79 'quot':105 'rate':103,128 'request':122 'request/response':186 'resolv':196 'resourc':52 'retriev':60 'return':167,221 'schema':179 'sentiment':93 'settl':43 'show':140 'span':89 'specif':51,138,208 'suggest':55 'suit':86 'summar':95 'though':62 'token':104 'unit':146 'unknown':223 'usdc':15,30,45,148 'usdc-base' 'util':110 'valid':112,169 'via':10,25 'wallet':201 'web3':99 'x402':11,26,41,134,170 'x402 API' 'x402-payment'","prices":[{"id":"4c7e2e04-e9a9-4073-b57c-f52a72d1d3b6","listingId":"bb7688b4-7859-491f-a5e9-2b86f7a0c231","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/164","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.412Z"}],"sources":[{"listingId":"bb7688b4-7859-491f-a5e9-2b86f7a0c231","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/164","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.412Z","lastSeenAt":"2026-04-22T02:32:06.990Z"}],"details":{"listingId":"bb7688b4-7859-491f-a5e9-2b86f7a0c231","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/164 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/164"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider advertises APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium content or messages behind a per-call USDC paywall","Agent-driven API consumption without API keys or subscriptions","Programmatic pay-per-use access to various data and utility endpoints"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing","Quick one-off API calls without account setup"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where per-call pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.093Z"},"updatedAt":"2026-04-22T02:32:06.990Z"}}