{"id":"c7f8f4fb-e642-4f10-8a69-13bf2002f0de","shortId":"GkQ4Pg","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/charges/384` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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.\n\nHowever, the specific endpoint `/api/v1/charges/384` does not clearly map to any of the named API categories on the landing page. Its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional technical content. Without an OpenAPI schema, request/response examples, or detailed documentation, it is unclear what this particular endpoint actually does beyond accepting a payment and returning JSON.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","low fee API","crypto API payment"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet'","The endpoint path /api/v1/charges/384 does not correspond to any named API on the landing page","No OpenAPI or output schema describing what this endpoint returns","No request body schema or example provided anywhere","Purpose of 'Premium API Access' is undefined — unclear what data or service is delivered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/384","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/384","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 402 challenge, confirming it accepts USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific endpoint's purpose ('Premium API Access') is entirely opaque. This is effectively a stub 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'/call':13,28 '/request':158 '0.02':12,27,79,157 '000':73 '20':72 '402':67 '6':83 'Base network API' 'USDC pay-per-call' 'accept':46,236 'access':63,187 'actual':233 'addit':214 'advertis':112 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,62,88,114,175,186,203 'attach':97 'base':8,23,51,74 'beyond':235 'broader':110 'call':86 'caller':95 'categori':115,176 'challeng':68 'classif':131 'clear':168 'connect':209 'content':216 'convers':148 'crypto API payment' 'data':117,121,194 'decim':84 'descript':182 'detail':224 'doc':200 'document':191,225 'embed':132 'endpoint':55,151,164,232 'estim':142 'exampl':222 'exchang':137 'export':122 'feed':136 'financ':133 'function':196 'gas':141 'generat':149 'geocod':146 'given':80 'header':102 'howev':161 'i.e':78 'includ':116 'infrastructur':144 'insight':123 'json':241 'json-response' 'key':89 'land':179 'learn':126 'limit':92 'list':59,153 'low fee API' 'lowpaymentfee.com':31 'machin':125 'map':169 'metric':119 'micropayment API' 'multipl':113 'name':174 'network':9,24,52 'no-api-key' 'openapi':219 'page':180,204 'particular':231 'pay':2,17,35 'pay-per-request':1,16,34 'payment':48,101,107,238 'per':3,18,36,85 'platform':6,21,39,111 'point':160 'premium':61,185 'price':135,159,201 'prompt':211 'proof':108 'protocol':44 'quot':140 'rate':91,138 'render':206 'report':120 'request':4,19,37,69 'request/response':221 'requir':94 'return':65,198,240 'schema':220 'sentiment':127 'simpli':96,184 'specif':54,163 'summar':130 'technic':215 'text':129 'token':139 'unclear':228 'unit':75 'usdc':15,30,47,77,81 'usdc-base-network' 'use':41 'util':145 'valid':105,147 'via':10,25 'wallet':210 'web3':134 'without':217 'x':100 'x-payment':99 'x402':11,26,43,106 'x402 API' 'x402-payment'","prices":[{"id":"b511fceb-4151-4ae4-bd11-0024ecffc96f","listingId":"c7f8f4fb-e642-4f10-8a69-13bf2002f0de","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/384","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:18.690Z"}],"sources":[{"listingId":"c7f8f4fb-e642-4f10-8a69-13bf2002f0de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/384","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:18.690Z","lastSeenAt":"2026-04-23T23:02:31.240Z"}],"details":{"listingId":"c7f8f4fb-e642-4f10-8a69-13bf2002f0de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/384 \\\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 requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/384"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/384"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need to pay per call using on-chain USDC","Testing x402 protocol integrations on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can settle micropayments in USDC on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.913Z"},"updatedAt":"2026-04-23T23:02:31.240Z"}}