{"id":"cb3f8c9f-dd15-49f2-90af-cc7b3ddc841d","shortId":"yaMpCw","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (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 priced at $0.02 per request, settled in USDC on Base.\n\nThe specific endpoint `/api/v1/payments/298` is labeled \"Premium API Access\" in the x402 challenge. Its exact functionality is not documented beyond this label — the crawled docs, pricing, and README pages all returned only a \"Connect wallet\" stub with no additional detail. The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No OpenAPI schema, request/response examples, or detailed documentation were found.\n\nBecause the endpoint's actual behavior behind the paywall is undocumented, agents should treat this as a low-friction, inexpensive exploratory call. The site advertises no API keys, no rate limits, and instant access for all its endpoints.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","Base network api","premium api access"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","The specific function of /api/v1/payments/298 ('Premium API Access') is not described anywhere","No OpenAPI spec, request schema, or response schema found","No examples of request or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/298","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/payments/298","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 confirms pricing and network, but there is zero documentation on what this specific endpoint actually does or returns. Docs, pricing, README, and API pages all render only a 'Connect wallet' stub. Without request/response schemas or functional descriptions, this is effectively a stub 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'0.02':10,29,101,171 '000':165 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':180 '20':164 '6':173 'Base network api' 'USDC micropayment api' 'accept':157 'access':6,25,46,117,225 'actual':195 'addit':147 'address':179 'advertis':216 'agent':202 'ai':71 'analysi':75 'analyt':70 'api':5,24,45,67,116,218 'base':8,27,54,108,166 'behavior':196 'behind':197 'beyond':128 'broad':60 'call':66,213 'catalog':61 'challeng':121,151 'charg':160 'classif':77 'confirm':152 'connect':142 'convers':94 'crawl':132 'data':69 'decim':174 'detail':148,187 'doc':133 'document':127,188 'embed':78 'endpoint':40,97,111,154,193,229 'estim':88 'exact':123 'exampl':185 'exchang':83 'exploratori':212 'feed':82 'financ':79 'found':190 'friction':210 'function':124 'gas':87 'gate':3,22 'generat':95 'geocod':92 'given':172 'host':58 'i.e':170 'inexpens':211 'infrastructur':90 'instant':224 'key':16,35,219 'label':114,130 'learn':73 'limit':19,38,222 'live':156 'low':209 'low-frict':208 'lowpaymentfee' 'lowpaymentfee.com':42 'machin':72 'maximum':162 'network':55 'no-api-key' 'openapi':182 'page':137 'pay':9,28,64,176 'pay-per-cal':63 'pay-per-call api' 'pay-per-request' 'payment':50 'paywal':199 'per':11,30,65,102 'post':158 'post-endpoint' 'premium':4,23,44,115 'premium api access' 'price':81,99,134 'protocol':51 'provid':43 'quot':86 'rate':18,37,84,221 'readm':136 'request':12,31,103,159 'request/response':184 'return':139 'schema':183 'sentiment':74 'settl':104 'site':57,215 'span':68 'specif':110 'stub':144 'summar':76 'token':85 'treat':204 'undocu':201 'unit':167 'usdc':14,33,106,169 'usdc-base' 'util':91 'valid':93 'via':47 'wallet':143 'web3':80 'x402':2,21,49,120,150 'x402 api' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"07a1afda-4efd-4f7d-bf36-4818c3bfad0e","listingId":"cb3f8c9f-dd15-49f2-90af-cc7b3ddc841d","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/payments/298","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:09.994Z"}],"sources":[{"listingId":"cb3f8c9f-dd15-49f2-90af-cc7b3ddc841d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/298","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:09.994Z","lastSeenAt":"2026-04-23T14:01:24.431Z"}],"details":{"listingId":"cb3f8c9f-dd15-49f2-90af-cc7b3ddc841d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/298 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, confirming it is live on Base with USDC","source_url":"https://lowpaymentfee.com/api/v1/payments/298"},{"claim":"All endpoints priced at $0.02 per request, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/298"},{"claim":"Site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing low-cost, keyless API access with per-call USDC micropayments","Programmatic access to a catalog of data, AI, finance, and utility endpoints without subscription","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents that need frictionless, no-signup API access","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation or response schemas before calling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.849Z"},"updatedAt":"2026-04-23T14:01:24.431Z"}}