{"id":"876c5b7d-0877-4048-b545-e22b4f7f2c85","shortId":"ffdM5c","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/payments/120`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). 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 broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but the actual behavior behind the paywall and the response format for `/api/v1/payments/120` specifically are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no technical content","No OpenAPI or schema definition found for any endpoint","The specific purpose and response format of /api/v1/payments/120 is unknown — 'Premium API Access' is a generic label","Cannot verify what data or service is actually returned behind the paywall"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/120","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/payments/120 is unclear beyond the generic label 'Premium API Access'. This is effectively a stub 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'/api/v1/payments/120':55,231 '/docs':173 '/pricing':174 '/readme':177 '/request':13,28,166 '0.02':12,27,86,165 '000':81 '0x8335':71 '20':80 '2913':72 '402':217 '402 payment endpoint' '6':91 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,42,60 'across':123 'actual':221 'advertis':121 'ai':133 'amount':78 'analysi':137 'analyt':127 'api':6,21,40,59,94 'attach':105 'avail':204 'base':9,24,50,74,82 'base-network' 'behavior':222 'behind':223 'broader':118 'call':4,19,88 'caller':103 'categori':125 'challeng':218 'classif':140 'collect':34 'commit':100 'confirm':212 'connect':183 'contract':70 'convers':157 'crawl':207 'crypto-paid API' 'data':126,130 'decim':92 'detail':190 'document':168,199 'embed':141 'endpoint':41,54,122,161,210 'equal':85 'estim':151 'exampl':203 'exchang':146 'export':131 'extrem':170 'feed':145 'financ':142 'format':229 'four':124 'gas':150 'generat':158 'geocod':155 'header':110 'host':32 'infrastructur':153 'insight':132 'key':95 'label':57 'learn':135 'limit':97 'list':160 'live':213 'lowpaymentfee' 'lowpaymentfee.com':31,119 'machin':134 'materi':208 'maximum':77 'metric':128 'network':51 'no-api-key' 'openapi':194 'page':178 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,65,109,115 'paywal':225 'per':3,18,38,87 'platform':120 'post':63 'post-endpoint' 'premium':5,20,58 'price':144,167 'prompt':185 'proof':116 'proper':216 'protocol':47 'quot':149 'rate':96,147 'render':180 'report':129 'request':39,64 'request/response':197 'requir':102 'respons':228 'return':214 'schema':198 'sentiment':136 'settl':67 'share':162 'simpli':104 'spars':171 'spec':195 'specif':53,232 'summar':139 'technic':189 'text':138 'token':148 'unit':83 'unknown':234 'upfront':99 'usag':202 'usdc':15,30,69,89 'usdc-settlement' 'use':90 'util':154 'valid':113,156 'via':10,25,43 'wallet':184 'web3':143 'x':108 'x-payment':107 'x402':11,26,45,114 'x402 API' 'x402-payment'","prices":[{"id":"560e4a0e-90ca-4401-8c83-957d9f11bf85","listingId":"876c5b7d-0877-4048-b545-e22b4f7f2c85","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:23.313Z"}],"sources":[{"listingId":"876c5b7d-0877-4048-b545-e22b4f7f2c85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:23.313Z","lastSeenAt":"2026-04-23T19:01:17.212Z"}],"details":{"listingId":"876c5b7d-0877-4048-b545-e22b4f7f2c85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/120 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/120"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/120"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without requiring API key registration","Making one-off paid API calls settled instantly in USDC on Base","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers who want instant API access without signup or API keys","Agent-based systems that can settle x402 payments programmatically","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Anyone without a Base-compatible wallet or USDC balance","High-volume consumers who need bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:10.017Z"},"updatedAt":"2026-04-23T19:01:17.212Z"}}