{"id":"892ea945-f718-4c8b-9caf-7678224c267c","shortId":"Q8Fx9Q","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 protocol on the Base network. This specific endpoint (`/api/v1/charges/298`) is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge indicates a maximum amount of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. No API keys or rate limits are advertised; 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 are priced at $0.02 per request.\n\nDocumentation is extremely sparse — 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 example payloads available. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what request body this particular endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request/response format is unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific purpose of /api/v1/charges/298 ('Premium API Access') is not explained anywhere","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/298","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/charges/298","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 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 no examples. The purpose of this specific '/charges/298' endpoint is entirely opaque beyond its 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'/api/v1/charges/298':54 '/call':13,28 '/docs':169 '/pricing':171 '/readme':173 '0.02':12,27,90,161 '000':80 '0x8335':67 '20':79 '2913':68 '402':208 '6':85 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,42,60 'across':121 'advertis':100,119 'ai':131 'amount':77 'analysi':135 'analyt':125 'api':6,21,40,59,94 'attach':103 'avail':200 'base':9,24,49,70,81 'bodi':218 'broader':116 'caller':101 'categori':123 'challeng':73,209 'classif':138 'collect':34 'connect':179 'contract':66 'convers':155 'crypto-paid API' 'data':124,128 'decim':86 'detail':186 'document':164,195,212 'embed':139 'endpoint':41,53,120,202,221 'equal':89 'estim':149 'exampl':198 'exchang':144 'expect':222 'export':129 'extrem':166 'feed':143 'financ':140 'four':122 'gas':148 'generat':156 'geocod':153 'header':108 'host':32 'http-post' 'indic':74 'infrastructur':151 'insight':130 'key':95 'learn':133 'limit':98 'list':56 'live':204 'lowpaymentfee' 'lowpaymentfee.com':31,117 'machin':132 'maximum':76 'metric':126 'network':50 'no-api-key' 'openapi':190 'page':174 'particular':220 'pay':2,17,37 'pay-per-call API' 'pay-per-request':1,16,36 'payload':199 'payment':63,107,113 'per':3,18,38,91,162 'platform':118 'premium':5,20,58 'premium API access' 'price':142,159 'prompt':181 'proof':114 'proper':207 'protocol':46 'quot':147 'rate':97,145 'render':176 'report':127 'request':4,19,39,92,163,217 'request/response':193 'respons':225 'return':205,227 'schema':194 'sentiment':134 'simpli':102 'spars':167 'spec':191 'specif':52 'summar':137 'technic':185 'text':136 'token':146 'unclear':215 'unit':82 'usdc':15,30,65,88 'usdc-base' 'util':152 'valid':111,154 'via':10,25,43 'wallet':180 'web3':141 'without':211 'x':106 'x-payment':105 'x402':11,26,45,72,112 'x402 API' 'x402-payment'","prices":[{"id":"88c497d2-7c3a-4023-a159-0250b1631aff","listingId":"892ea945-f718-4c8b-9caf-7678224c267c","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/charges/298","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:00.464Z"}],"sources":[{"listingId":"892ea945-f718-4c8b-9caf-7678224c267c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/298","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:00.464Z","lastSeenAt":"2026-04-24T01:32:05.912Z"}],"details":{"listingId":"892ea945-f718-4c8b-9caf-7678224c267c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/298 \\\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 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/298"},{"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 in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/298"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access without subscription commitments or rate limits"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.845Z"},"updatedAt":"2026-04-24T01:32:05.912Z"}}