{"id":"be766d48-3830-4775-8fa2-501f0ccee1c8","shortId":"CayygP","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 gated by the x402 payment protocol. The `/api/v1/payments/302` endpoint is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network in USDC (contract 0x8335…2913) at a maximum cost of 20,000 base units, which equals $0.02 per request (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 specific functionality behind the `/api/v1/payments/302` path is not described beyond its title. The endpoint is confirmed live (returns a valid 402 challenge).","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","The specific purpose of /api/v1/payments/302 ('Premium API Access') is not explained beyond its title","No example requests or responses are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/302","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/302","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 with a valid x402 402 challenge and 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 functionality of the /payments/302 path is undescribed. This is effectively a stub 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'/api/v1/payments/302':49,211 '/docs':170 '/pricing':171 '/readme':174 '/request':13,28,163 '0.02':12,27,83,162 '000':78 '0x8335':70 '20':77 '2913':71 '402':227 '6':88 'Base network API' 'USDC micropayment API' 'accept':57 'access':7,22,55 'across':120 'advertis':118 'ai':130 'analysi':134 'analyt':124 'api':6,21,40,54,91 'attach':102 'avail':201 'base':9,24,65,79 'base-network' 'behind':209 'beyond':216 'broader':115 'call':4,19 'caller':100 'categori':122 'challeng':228 'classif':137 'collect':34 'commit':97 'confirm':222 'connect':180 'contract':69 'convers':154 'cost':75 'crawl':204 'crypto-gated API' 'data':123,127 'decim':89 'describ':215 'detail':187 'document':165,196 'embed':138 'endpoint':41,50,119,158,220 'equal':82 'estim':148 'exampl':200 'exchang':143 'export':128 'extrem':167 'feed':142 'financ':139 'four':121 'function':208 'gas':147 'gate':42 'generat':155 'geocod':152 'header':107 'host':32 'infrastructur':150 'insight':129 'json-response' 'key':92 'label':52 'learn':132 'limit':94 'list':157 'live':223 'lowpaymentfee' 'lowpaymentfee.com':31,116 'machin':131 'materi':205 'maximum':74 'metric':125 'network':66 'no-api-key' 'openapi':191 'page':175 'path':212 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,60,106,112 'per':3,18,38,84 'platform':117 'post':58 'post-method' 'premium':5,20,53 'premium API access' 'price':141,164 'prompt':182 'proof':113 'protocol':47 'quot':146 'rate':93,144 'render':177 'report':126 'request':39,59,85 'request/response':194 'requir':99 'return':224 'schema':195 'sentiment':133 'settl':62 'share':159 'simpli':101 'spars':168 'spec':192 'specif':207 'summar':136 'technic':186 'text':135 'titl':218 'token':145 'unit':80 'upfront':96 'usag':199 'usdc':15,30,68,86 'usdc-settlement' 'use':87 'util':151 'valid':110,153,226 'via':10,25 'wallet':181 'web3':140 'x':105 'x-payment':104 'x402':11,26,45,111 'x402 API' 'x402-payment'","prices":[{"id":"d70ec46a-a5f5-45e9-9455-55924bb57de5","listingId":"be766d48-3830-4775-8fa2-501f0ccee1c8","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/302","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:13.192Z"}],"sources":[{"listingId":"be766d48-3830-4775-8fa2-501f0ccee1c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/302","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:13.192Z","lastSeenAt":"2026-04-23T14:31:10.585Z"}],"details":{"listingId":"be766d48-3830-4775-8fa2-501f0ccee1c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/302 \\\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 a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/302"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/302"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.739Z"},"updatedAt":"2026-04-23T14:31:10.585Z"}}