{"id":"12d0d6cb-9fb6-4bf9-9020-3b65cc9a0641","shortId":"kkThN2","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 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/308` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across 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 endpoints are listed at $0.02 per request.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/charges/308` endpoint specifically returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality \"Premium API Access\" actually provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific function of /api/v1/charges/308 ('Premium API Access') is not explained anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/308","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/308","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/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no usable content. The purpose of this specific endpoint (/api/v1/charges/308) is entirely 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66,197 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,212 'across':108 'actual':213 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,159,211 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'categori':110 'challeng':67,198 'classif':125 'confirm':199 'connect':168 'content':174 'convers':142 'data':111,115,207 'descript':185 'doc':158 'document':153,202 'embed':126 'endpoint':55,107,145,190,194 'estim':136 'exampl':182 'exchang':131 'export':116 'extrem':155 'feed':130 'financ':127 'four':109 'function':209 'gas':135 'generat':143 'geocod':140 'header':99 'howev':152 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'label':59 'learn':120 'limit':89 'list':147 'live':196 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':178 'page':163 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'premium':60,210 'price':129,160 'prompt':170 'protocol':44 'provid':214 'quot':134 'rate':88,132 'readm':162 'render':165 'report':114 'request':37,68,102,151 'request/response':181 'return':64,192 'schema':179 'sentiment':121 'simpli':94 'specif':54,191 'summar':124 'text':123 'thin':156 'token':133 'unclear':205 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':169 'web3':128 'without':201 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"315b5e99-751a-4351-ac56-06fdc75b8d69","listingId":"12d0d6cb-9fb6-4bf9-9020-3b65cc9a0641","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/308","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:03.660Z"}],"sources":[{"listingId":"12d0d6cb-9fb6-4bf9-9020-3b65cc9a0641","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/308","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:03.660Z","lastSeenAt":"2026-04-24T13:31:59.983Z"}],"details":{"listingId":"12d0d6cb-9fb6-4bf9-9020-3b65cc9a0641","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/308 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/308"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/308"}],"useCases":["Accessing pay-per-request API services without API key registration","Making micropayment-gated API calls using USDC on Base","Agent-driven API consumption with per-call crypto payments"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or rate-limited tiers","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.694Z"},"updatedAt":"2026-04-24T13:31:59.983Z"}}