{"id":"c7a395ad-0a01-48b2-a6b4-72dd38ab762b","shortId":"kFKPzd","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/invoices/12` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call.\n\nThe broader platform advertises four categories of APIs: 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 uniformly at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\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/invoices/12` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what payload to send or what data to expect back.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","data analytics api","ai inference api"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific endpoint /api/v1/invoices/12 is labeled 'Premium API Access' but its actual functionality is undocumented","Cannot verify what data or service any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/12","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/12","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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what the invoices/12 endpoint actually does. The listing is effectively a 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'openapi':177 'page':161 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payload':210 'per':3,22,46,88,138 'platform':92 'premium':69 'price':116,134,158 'prompt':168 'protocol':54 'quot':121 'rate':119,145 'readm':160 'render':163 'report':101 'request':4,23,47,77,139 'request/response':180 'respond':197 'return':73,191 'schema':178 'send':212 'sentiment':108 'sentiment-analysis' 'settl':50 'spars':154 'specif':62 'suit':6,25 'summar':111 'technic':172 'text':110 'text-summarization' 'token':120 'unclear':208 'uniform':135 'unit':83 'usdc':60,85 'usdc api' 'usdc-settlement' 'use':59 'util':15,34,126 'utility-apis' 'valid':128,200 'via':9,28,51 'wallet':167 'web3':115 'without':204 'x402':10,29,53,201 'x402 api' 'x402-payment'","prices":[{"id":"7d88e0c4-c465-4b6c-b3be-2c8575968e87","listingId":"c7a395ad-0a01-48b2-a6b4-72dd38ab762b","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:45.181Z"}],"sources":[{"listingId":"c7a395ad-0a01-48b2-a6b4-72dd38ab762b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:45.181Z","lastSeenAt":"2026-04-23T18:03:21.107Z"}],"details":{"listingId":"c7a395ad-0a01-48b2-a6b4-72dd38ab762b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/12 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/invoices/12"},{"claim":"The platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/12"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding, validation, and conversion via crypto-settled requests"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents and bots that can settle payments via x402 on Base","Projects needing low-friction access to diverse API categories without signup"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.803Z"},"updatedAt":"2026-04-23T18:03:21.107Z"}}