{"id":"c1169b54-f42a-4994-b8a6-ba8372383133","shortId":"AfL4kH","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/claims/23` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof to receive the response.\n\nThe broader platform organizes its endpoints into four 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 listed endpoints are priced at $0.02 per request and settle in USDC on Base.\n\nNote that the specific endpoint `/api/v1/claims/23` does not clearly map to any of the named categories on the landing page, and no documentation, request/response schemas, or examples are available beyond the 402 challenge itself. The docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. The actual functionality behind this particular claims endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","402 payment endpoint"],"warnings":["The specific endpoint /api/v1/claims/23 ('Premium API Access') does not correspond to any documented endpoint on the landing page — its actual functionality is unknown.","No API documentation, request schema, or response schema is available; all doc pages render only 'Connect wallet'.","The platform lists many endpoint categories but provides no detail on inputs, outputs, or error handling for any of them.","Cannot verify what data or service is actually returned after payment is made."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/23","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/claims/23","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 402 challenge, confirming x402 protocol compliance. However, there is no documentation, no request/response schema, no examples, and the purpose of '/api/v1/claims/23' is unclear — it doesn't match any named endpoint on the landing page. All secondary pages returned only 'Connect wallet' with no 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'/request':17,34 '0.02':16,33,86,167 '000':81 '20':80 '402':73,207 '402 payment endpoint' 'Base network API' 'USDC API' 'access':69,101 'actual':229 'advertis':92 'ai':10,27,136 'analysi':140 'analyt':130 'api':4,21,41,68,94,212 'attach':104 'avail':204 'base':7,24,57,82,175 'base-network' 'behind':49,231 'beyond':205 'broader':121 'call':89 'caller':102 'categori':128,191 'challeng':74,208 'claim':234 'classif':143 'clear':184 'connect':221 'content':227 'convers':159 'data':9,26,129,133 'doc':211 'document':198 'embed':144 'endpoint':14,31,48,61,125,163,180,235 'estim':154 'exampl':202 'exchang':149 'export':134 'feed':148 'financ':11,28,145 'four':127 'function':230 'gas':153 'gate':3,20,44 'generat':160 'geocod':157 'header':109 'infrastructure/utilities':156 'insight':135 'instant':100 'json-response' 'key':95 'land':194 'learn':138 'limit':98 'list':65,162 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':137 'map':185 'metric':131 'micropay':54 'micropayment API' 'name':190 'network':58 'no-api-key' 'note':176 'offer':8,25 'organ':123 'page':195,216 'particular':233 'pay-per-request API' 'payment':76,108,114 'per':51,88,168 'per-request':50 'per-request-billing' 'platform':5,22,42,91,122 'post-method' 'premium':67 'price':147,165,213 'prompt':223 'proof':115 'protocol':40 'quot':152 'rate':97,150 'readm':215 'receiv':117 'render':218 'report':132 'request':52,169 'request/response':199 'requir':75 'respons':119 'return':71 'schema':200 'sentiment':139 'settl':171 'simpli':103 'specif':60,179 'substant':226 'summar':142 'text':141 'token':151 'unit':83 'unknown':237 'usd':87 'usdc':53,85,173 'usdc-micropayment' 'util':13,30 'valid':112,158 'varieti':46 'wallet':222 'web3':146 'x':107 'x-payment':106 'x402':2,19,39,113 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8a65c7c6-3305-45d2-8269-b6e103b5b483","listingId":"c1169b54-f42a-4994-b8a6-ba8372383133","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/claims/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:43.450Z"}],"sources":[{"listingId":"c1169b54-f42a-4994-b8a6-ba8372383133","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:43.450Z","lastSeenAt":"2026-04-23T21:32:04.663Z"}],"details":{"listingId":"c1169b54-f42a-4994-b8a6-ba8372383133","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/23"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/23"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to gated API resources without traditional API key management","Agent-driven workflows that need pay-per-call access to data or utility endpoints","Demonstrating x402 protocol micropayment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-volume consumers who want to avoid subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone who needs to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.647Z"},"updatedAt":"2026-04-23T21:32:04.663Z"}}