{"id":"53a4f1ab-603c-43d6-8897-733b22073b5f","shortId":"bex4Sg","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 protocol on the Base network. This specific endpoint (`/api/v1/invoices/7`) is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The payment scheme is \"exact,\" meaning the caller pays a fixed amount per call with no subscription or API key required.\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 endpoints 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 specific purpose of `/api/v1/invoices/7` (as opposed to the other listed endpoints) is unclear; the name \"Premium API Access\" is generic and does not describe what data or functionality is returned. Callers should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-payment","base-network","no-api-key","invoice-api"],"categories":["finance","infrastructure"],"synonyms":["pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","invoice API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/invoices/7 ('Premium API Access') is not described anywhere","No request body schema or response schema is documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/7","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/invoices/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually returns, no OpenAPI spec, no request/response schemas, and no examples. The /docs and other pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/api/v1/invoices/7':54,201 '/docs':165 '/pricing':167 '/readme':169 '/request':13,28 '0.02':12,27,82,157 '000':77 '0x8335':67 '20':76 '2913':68 '6':87 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,60,215 'across':116 'advertis':114 'ai':126 'amount':100 'analysi':130 'analyt':120 'api':6,21,40,59,107,214 'avail':196 'base':9,24,49,70,78 'base-network' 'broader':111 'call':4,19,102 'caller':96,228 'categori':118 'classif':133 'collect':34 'connect':175 'contact':234 'contract':66 'convers':150 'cost':74 'crypto-paid API' 'data':119,123,223 'decim':88 'describ':221 'detail':182,238 'document':160,191 'embed':134 'endpoint':41,53,115,153,208 'equal':81 'estim':144 'exact':93 'exampl':194 'exchang':139 'expect':230 'experi':232 'export':124 'extrem':162 'feed':138 'financ':135 'fix':99 'four':117 'function':225 'gas':143 'gate':42 'generat':151 'generic':217 'geocod':148 'host':32 'infrastructur':146 'insight':125 'invoice API' 'invoice-api' 'key':108 'learn':128 'list':56,207 'lowpaymentfee' 'lowpaymentfee.com':31,112 'machin':127 'maximum':73 'mean':94 'metric':121 'name':212 'network':50 'no-api-key' 'openapi':186 'oppos':203 'page':170 'pay':2,17,37,97 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':195 'payment':63,90 'per':3,18,38,83,101,158 'per-request-billing' 'platform':113 'premium':5,20,58,213 'price':137,155 'prompt':177 'protocol':46 'provid':236 'purpos':199 'quot':142 'rate':140 'render':172 'report':122 'request':39,84,159 'request/response':189 'requir':109 'return':227 'schema':190 'scheme':91 'sentiment':129 'spars':163 'spec':187 'specif':52,198 'subscript':105 'summar':132 'technic':181 'text':131 'token':141 'unclear':210 'unit':79 'usdc':15,30,65,85 'usdc-payment' 'use':86 'util':147 'valid':149 'via':10,25 'wallet':176 'web3':136 'x402':11,26,45 'x402 endpoint' 'x402-payment'","prices":[{"id":"eb267740-fbd1-4e07-8106-edd1ba4ccc94","listingId":"53a4f1ab-603c-43d6-8897-733b22073b5f","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/invoices/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:40.972Z"}],"sources":[{"listingId":"53a4f1ab-603c-43d6-8897-733b22073b5f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:40.972Z","lastSeenAt":"2026-04-29T12:34:43.554Z"}],"details":{"listingId":"53a4f1ab-603c-43d6-8897-733b22073b5f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/7 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/invoices/7"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"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/invoices/7"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without API key management","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-as-you-go API access on Base","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads requiring well-documented schemas and error handling","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.011Z"},"updatedAt":"2026-04-29T12:34:43.554Z"}}