{"id":"2104ad28-4248-43c7-bc38-f788355cc8cc","shortId":"gyDX2N","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","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/payments/95` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). 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.\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. However, this specific listing is for the `/api/v1/payments/95` endpoint, whose exact functionality beyond \"Premium API Access\" is not documented in the crawled material.\n\nThe endpoint is live and returns a well-formed x402 challenge. Payment settles in USDC on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The docs, pricing, and README pages all returned minimal content (just a \"Connect wallet\" prompt), so detailed request/response schemas and usage documentation are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The exact functionality of /api/v1/payments/95 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema was found.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none are documented in detail; actual capabilities are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/95","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/95","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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of this endpoint is unclear beyond the generic label 'Premium API Access'. Docs pages returned only 'Connect wallet' with no usable 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'/request':12,28 '0.02':11,27,69,153 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':199 '20':72 '402 payment api' '6':79 'accept':48 'access':64,92,171 'across':112 'address':198 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,14,21,30,40,63,85,170 'attach':95 'base':8,24,53,74,196 'base network api' 'beyond':168 'broader':108 'call':4,20,71 'caller':93 'categori':114 'challeng':190 'charg':66 'classif':129 'connect':212 'content':209 'convers':146 'crawl':177 'data':115,119 'decim':80 'detail':216 'doc':201 'document':174,221 'embed':130 'endpoint':57,111,149,164,180 'estim':140 'exact':166 'exchang':135 'export':120 'feed':134 'financ':131 'form':188 'four':113 'function':167 'gas':139 'generat':147 'geocod':144 'header':100 'howev':156 'http-post' 'infrastructur':142 'insight':121 'instant':91 'key':15,31,86 'label':61 'learn':124 'limit':89 'list':151,159 'live':182 'low payment fee' 'lowpaymentfee.com':33 'machin':123 'materi':178 'metric':117 'micropayment api' 'minim':208 'network':54 'no-api-key' 'offer':110 'page':205 'pay':2,18,37 'pay per call api' 'pay-per-cal':1,17 'pay-per-request':36 'payment':50,99,105,191 'per':3,19,38,70,154 'platform':6,22,41,82,109 'premium':62,169 'price':133,202 'prompt':214 'proof':106 'protocol':46 'quot':138 'rate':88,136 'readm':204 'report':118 'request':39,155 'request/response':217 'requir':16,32 'return':184,207 'schema':218 'sentiment':125 'settl':192 'simpli':94 'specif':56,158 'summar':128 'text':127 'token':137 'unavail':223 'unit':75 'usag':220 'usdc':49,77,194 'usdc api' 'usdc-base' 'use':43 'util':143 'valid':103,145 'via':9,25 'wallet':213 'web3':132 'well':187 'well-form':186 'whose':165 'x':98 'x-payment':97 'x402':10,26,45,104,189 'x402 api' 'x402-payment'","prices":[{"id":"0ee23109-c413-425c-828f-8d95b9caceed","listingId":"2104ad28-4248-43c7-bc38-f788355cc8cc","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:55.057Z"}],"sources":[{"listingId":"2104ad28-4248-43c7-bc38-f788355cc8cc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:55.057Z","lastSeenAt":"2026-04-24T01:32:23.539Z"}],"details":{"listingId":"2104ad28-4248-43c7-bc38-f788355cc8cc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/95 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/95"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/95"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-use API access","Users who want to avoid API key management and subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.676Z"},"updatedAt":"2026-04-24T01:32:23.539Z"}}