{"id":"493465c3-1544-4583-ae3e-773dae17e7fd","shortId":"FAgUme","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/charges/68` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. The challenge specifies the `exact` payment scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (docs, pricing, and README pages only show a \"Connect wallet\" prompt), so the actual behavior and response schemas of individual endpoints are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["general","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","402 payment api"],"warnings":["No API documentation available — docs, pricing, and README pages are empty","The endpoint path '/api/v1/charges/68' does not correspond to any of the named endpoints listed on the landing page; its actual functionality is unknown","No request or response schema is documented anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/68","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/charges/68","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 402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation of request/response formats, and no examples. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The specific purpose of '/api/v1/charges/68' labeled 'Premium API Access' is unclear — it doesn't map to any of the named endpoints on the landing page. This is effectively a stub 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'/request':13,28 '0.02':12,27,59,138,191 '000':122 '0x8335':127 '20':121 '2913':128 '300':150 '402':116 '402 payment api' '6':134 'accept':155 'access':112 'across':45 'actual':216 'advertis':164 'ai/ml':48 'analysi':168 'analyt':47 'api':5,20,37,71,111 'application/json':160 'attach':87 'base':8,23,67,123,130 'base network api' 'behavior':217 'beyond':196 'broader':162 'call':4,19,140 'caller':86 'challeng':117,142 'classif':171 'commit':78 'connect':211 'convers':183 'data':46,185 'decim':135 'doc':203 'document':195 'embed':172 'empti':202 'enabl':36 'endpoint':44,55,104,154,165,223 'equal':137 'essenti':201 'estim':180 'exact':145 'exchang':175 'feed':174 'finance/web3':50 'gas':179 'generat':186 'geocod':181 'handl':83 'header':90 'howev':194 'http':93 'http-post' 'immedi':99 'individu':222 'infer':49 'infrastructur':52 'inlin':85 'json-response' 'key':72 'land':198 'limit':75 'list':108 'low payment fee' 'lowpaymentfee.com':31 'marketplac':38 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'page':199,207 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,89,146 'per':3,18,60,139 'platform':6,21,163 'point':193 'post':156 'premium':110 'price':57,173,192,204 'prompt':213 'protocol':82 'quot':178 'rate':74,176 'readm':206 'receiv':96 'request':61,94,118,157 'requir':79 'respons':98,219 'return':114,159 'schema':220 'scheme':147 'second':151 'sentiment':167 'settlement':101 'show':209 'sinc':131 'specif':103 'specifi':143 'summar':170 'text':169 'timeout':152 'token':177 'undocu':225 'unit':124 'upon':100 'usdc':15,30,64,126,132 'usdc api' 'usdc-base-network' 'use':133 'util':53 'valid':182 'varieti':42 'via':10,25 'wallet':212 'x402':11,26,35,81 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"96b94154-eb66-4a0e-9cfb-40b7a5838b74","listingId":"493465c3-1544-4583-ae3e-773dae17e7fd","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/charges/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:30.798Z"}],"sources":[{"listingId":"493465c3-1544-4583-ae3e-773dae17e7fd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:30.798Z","lastSeenAt":"2026-04-22T09:01:02.990Z"}],"details":{"listingId":"493465c3-1544-4583-ae3e-773dae17e7fd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/68 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/68"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns on Base","AI agents needing keyless, instant API access","Low-volume or sporadic API consumers who want no subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation and response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.329Z"},"updatedAt":"2026-04-22T09:01:02.990Z"}}