{"id":"cbf2d338-232a-4159-8b95-d0b1617dc7cf","shortId":"2cbVGx","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/charges/347` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. Payment is handled via the x402 protocol — no API keys, no subscriptions, just an X-PAYMENT header with each request.\n\nThe 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 listed 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 content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The `/api/v1/charges/347` endpoint itself is live and returns a valid 402 challenge, but without documentation it is unclear what inputs it expects or what data it returns. The platform claims no rate limits and instant access.","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":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for any endpoint","The specific endpoint /api/v1/charges/347 has no description beyond 'Premium API Access' — its actual functionality is unknown","Cannot verify that the advertised AI, finance, data, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/347","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/347","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. It is impossible to determine what this specific endpoint actually does beyond the generic label 'Premium API Access'. The listing is essentially a 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api' 'network':64 'offer':10,29 'openapi':185 'page':170 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':90,106 'per':3,22,55,88,158 'platform':6,25,46,112,225 'premium':72 'price':136,155,167 'prompt':177 'protocol':96 'provid':48 'quot':141 'rate':139,228 'readm':169 'render':172 'report':121 'request':56,110,159 'request/response':188 'requir':76 'return':204,223 'schema':186 'sentiment':128 'sentiment-analysis' 'settl':58 'spars':163 'specif':66 'subscript':101 'summar':131 'text':130 'text-summarization' 'token':140 'unclear':214 'unit':83 'usdc':9,28,60,85 'usdc api' 'usdc-settlement' 'util':15,34,146 'utility-apis' 'valid':148,206 'via':93 'wallet':176 'web3':135 'without':210 'x':105 'x-payment':104 'x402':43,95 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d8f685bc-5dd2-45ea-a2d9-54fc520ee152","listingId":"cbf2d338-232a-4159-8b95-d0b1617dc7cf","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/347","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:12.698Z"}],"sources":[{"listingId":"cbf2d338-232a-4159-8b95-d0b1617dc7cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/347","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:12.698Z","lastSeenAt":"2026-04-23T08:01:18.443Z"}],"details":{"listingId":"cbf2d338-232a-4159-8b95-d0b1617dc7cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/347 \\\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":"All listed endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/charges/347 requires maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/347"},{"claim":"The platform claims no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/347"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC payment","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Crypto-native workflows that can settle in USDC on Base","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call pricing at $0.02 may be expensive compared to bulk plans","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.276Z"},"updatedAt":"2026-04-23T08:01:18.443Z"}}