{"id":"bac3293f-f533-46da-8e3f-c797934a8369","shortId":"9H7rvg","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/78` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call via the x402 exact payment scheme. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe wider platform advertises four endpoint 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 share the same $0.02/request pricing.\n\nThis particular endpoint (`/api/v1/keys/78`) does not have public documentation explaining its request or response schema beyond the x402 challenge metadata. The challenge confirms it accepts HTTP POST, returns `application/json`, and is discoverable. Without further docs or an OpenAPI spec, the exact input parameters and response structure remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","premium api access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact purpose and input/output format of /api/v1/keys/78 is undocumented","The broader platform lists many endpoints but none have public specs or examples","Crawled /api, /pricing, and /README pages returned no meaningful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/78","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/keys/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and settlement details, but there is no OpenAPI spec, no documentation of request/response schemas, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The purpose of the /api/v1/keys/78 endpoint specifically is unclear beyond its generic 'Premium API Access' 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'/request':19,38,166 '0.02':18,37,86,165 '000':80 '20':79 'accept':192 'access':74 'advertis':122 'ai':12,31,133 'analysi':137 'analyt':127 'api':5,24,45,73,96 'application/json':196 'attach':107 'base':8,27,63,81 'base network api' 'base-network' 'beyond':183 'broad':50 'call':4,23,88 'caller':105 'catalog':51 'categori':125 'challeng':186,189 'charg':76 'classif':140 'commit':102 'confirm':190 'convers':157 'data':11,30,126,130 'discover':199 'doc':202 'document':176 'embed':141 'enabl':44 'endpoint':16,35,57,67,124,161,170 'estim':151 'exact':92,208 'exchang':146 'explain':177 'export':131 'feed':145 'financ':13,32,142 'four':123 'gas':150 'generat':158 'geocod':155 'header':112 'http':193 'http-post' 'i.e':85 'infrastructur':153 'input':209 'insight':132 'json-api' 'key':97 'label':71 'learn':135 'limit':99 'list':160 'low payment fee' 'lowpaymentfee.com':39 'machin':134 'metadata':187 'metric':128 'micropayment api' 'network':64 'offer':10,29 'openapi':205 'paramet':210 'particular':169 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':93,111,117 'per':3,22,55,87 'platform':6,25,46,121 'post':194 'premium':72 'premium api access' 'price':144,167 'proof':118 'provid':48 'public':175 'quot':149 'rate':98,147 'remain':214 'report':129 'request':56,179 'requir':104 'respons':181,212 'return':195 'schema':182 'scheme':94 'sentiment':136 'settl':58 'share':162 'simpli':106 'spec':206 'specif':66 'structur':213 'summar':139 'text':138 'token':148 'unit':82 'unknown':215 'upfront':101 'usdc':9,28,60,84 'usdc api' 'usdc-settlement' 'util':15,34,154 'valid':115,156 'via':89 'web3':143 'wider':120 'without':200 'x':110 'x-payment':109 'x402':43,91,116,185 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e43851ae-3baf-4686-81e8-865d20ef7b62","listingId":"bac3293f-f533-46da-8e3f-c797934a8369","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/keys/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.797Z"}],"sources":[{"listingId":"bac3293f-f533-46da-8e3f-c797934a8369","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.797Z","lastSeenAt":"2026-04-22T01:02:19.215Z"}],"details":{"listingId":"bac3293f-f533-46da-8e3f-c797934a8369","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/78 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/78"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","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/keys/78"}],"useCases":["Programmatic access to premium API functionality with per-request USDC micropayments","Agent-driven workflows that need on-demand API access without pre-registration or API keys","Integrating pay-as-you-go endpoints into crypto-native applications on Base"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or subscription-based API access","Non-crypto workflows that cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.216Z"},"updatedAt":"2026-04-22T01:02:19.215Z"}}