{"id":"ce0f3650-f3cd-4c2b-83e4-95110e9c09ea","shortId":"srazx4","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/42` is listed as \"Premium API Access\" and returns a valid 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe site organizes its APIs into 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 listed endpoints share the same $0.02/request pricing. The probed endpoint (`/api/v1/payments/42`) does not clearly map to any of these named categories and may be a generic or demo payment endpoint.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live via the 402 challenge, but without documentation it is difficult to know what payload to send or what response to expect beyond `application/json`.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","analytics-api","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payments","metered API","serverless API billing"],"warnings":["No OpenAPI or schema documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet'","The endpoint path /api/v1/payments/42 does not correspond to any named API in the site's catalog; its actual functionality is unknown","No request body schema or response examples are documented anywhere in the crawl","All non-homepage pages appear to be empty or gated behind wallet connection"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific endpoint's purpose ('Premium API Access') is vague. Effectively a stub 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'/api/v1/payments/42':69,174 '/docs':199 '/pricing':201 '/readme':203 '/request':19,38,169 '0.02':18,37,92,168 '000':86 '20':85 '402':80,241 'Base network API' 'USDC micropayment API' 'access':75,106 'advertis':97 'ai':12,31,136 'ai-inference' 'analysi':140 'analyt':11,30,130 'analytics-api' 'api':5,24,45,74,99,125 'application/json':261 'attach':109 'avail':230 'base':8,27,63,87 'base-network' 'beyond':260 'broad':50 'call':4,23,94 'caller':107 'catalog':51 'categori':128,184 'challeng':81,242 'classif':143 'clear':177 'confirm':237 'connect':209 'convers':160 'cover':10,29 'crawl':233 'crypto API payments' 'data':129,133 'demo':191 'detail':216 'difficult':248 'document':194,225,245 'embed':144 'enabl':44 'endpoint':16,35,57,67,164,173,193,235 'estim':154 'exampl':229 'exchang':149 'expect':259 'export':134 'extrem':196 'feed':148 'financ':13,32,145 'finance-data' 'four':127 'gas':153 'generat':161 'generic':189 'geocod':158 'header':114 'i.e':91 'infrastructur':156 'insight':135 'instant':105 'json-response' 'key':100 'know':250 'learn':138 'limit':103 'list':71,163 'live':238 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':137 'map':178 'may':186 'metered API' 'metric':131 'name':183 'network':64 'no-api-key' 'offer':48 'openapi':220 'organ':123 'page':204 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payload':252 'payment':113,119,192 'per':3,22,55,93 'platform':6,25,46,96 'premium':73 'price':147,170 'probe':172 'prompt':211 'proof':120 'quot':152 'rate':102,150 'render':206 'report':132 'request':56,82 'request/response':223 'respons':257 'return':77 'schema':224 'send':254 'sentiment':139 'serverless API billing' 'settl':58 'share':165 'simpli':108 'site':122 'spec':221 'specif':66 'summar':142 'technic':215 'text':141 'thin':197 'token':151 'unit':88 'usag':228 'usdc':9,28,60,90 'usdc-settlement' 'util':15,34,157 'utility-services' 'valid':79,117,159 'via':239 'wallet':210 'web3':146 'without':244 'x':112 'x-payment':111 'x402':43,118 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"74cd0716-fbe5-4a79-9829-a1b2162dea85","listingId":"ce0f3650-f3cd-4c2b-83e4-95110e9c09ea","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:41.033Z"}],"sources":[{"listingId":"ce0f3650-f3cd-4c2b-83e4-95110e9c09ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:41.033Z","lastSeenAt":"2026-04-23T02:01:19.589Z"}],"details":{"listingId":"ce0f3650-f3cd-4c2b-83e4-95110e9c09ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The 402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x8335…) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/42"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics or reports without subscription commitments","Running AI inference (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, or exchange rates","Geocoding or data validation via utility endpoints"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micro-transactions for diverse API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.427Z"},"updatedAt":"2026-04-23T02:01:19.589Z"}}