{"id":"5f4bc195-aa5c-4b65-a71a-ae527e4484c6","shortId":"B974hp","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. The specific endpoint at `/api/v1/charges/289` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum charge 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, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/charges/289` endpoint specifically returns. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind this particular charge ID is unclear from available materials.","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","low payment fee API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/289 ('Premium API Access') is not documented anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/289","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/289","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, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The actual functionality of /api/v1/charges/289 is undescribed, making this effectively a stub 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'/api/v1/charges/289':56,206 '/docs':174 '/pricing':176 '/readme':178 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':218 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61 'across':124 'actual':222 'advertis':122 'ai':134 'analysi':138 'analyt':128 'api':6,21,40,60,95 'attach':106 'avail':232 'base':9,24,50,75,83 'base-network' 'behind':224 'broader':119 'call':4,19 'caller':104 'categori':126 'challeng':219 'charg':79,227 'classif':141 'collect':34 'commit':101 'confirm':213 'connect':184 'contract':71 'convers':158 'crypto-paid API' 'data':127,131 'decim':93 'descript':202 'detail':191 'document':169 'embed':142 'endpoint':41,54,123,162,207,211 'equal':86 'estim':152 'exampl':199 'exchang':147 'export':132 'extrem':171 'feed':146 'financ':143 'four':125 'function':223 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'id':228 'infrastructur':154 'insight':133 'key':96 'label':58 'learn':136 'limit':98 'list':161 'live':214 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'materi':233 'maximum':78 'metric':129 'network':51 'no-api-key' 'openapi':195 'page':179 'particular':226 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116 'per':3,18,38,88 'platform':121 'post':64 'post-endpoint' 'premium':5,20,59 'price':145,168 'prompt':186 'proof':117 'proper':217 'protocol':47 'quot':150 'rate':97,148 'render':181 'report':130 'request':39,65,89 'request/response':198 'requir':103 'return':209,215 'schema':196 'sentiment':137 'settl':68 'share':163 'simpli':105 'spars':172 'specif':53,208 'summar':140 'technic':190 'text':139 'token':149 'unclear':230 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':185 'web3':144 'x':109 'x-payment':108 'x402':11,26,45,115 'x402 API' 'x402-payment'","prices":[{"id":"3e40c337-4746-499c-9a7c-08c4aee354fc","listingId":"5f4bc195-aa5c-4b65-a71a-ae527e4484c6","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/289","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:53.876Z"}],"sources":[{"listingId":"5f4bc195-aa5c-4b65-a71a-ae527e4484c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/289","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:53.876Z","lastSeenAt":"2026-04-24T01:32:05.665Z"}],"details":{"listingId":"5f4bc195-aa5c-4b65-a71a-ae527e4484c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/289 \\\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 accepting USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/289"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/289"},{"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 data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, per-request API access"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with Base USDC wallets needing on-demand endpoints","Prototyping integrations without committing to subscription plans"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.079Z"},"updatedAt":"2026-04-24T01:32:05.665Z"}}