{"id":"d3d9f964-61bc-4843-be8c-edd7b939e705","shortId":"6MeHNF","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The `/api/v1/payments/201` endpoint is labeled \"Premium API Access\" and accepts USDC payments at a maximum cost of $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to a specified wallet address, with no API keys, rate limits, or upfront commitments required.\n\nThe broader 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 listed at the same $0.02 per request price point. However, the specific `/api/v1/payments/201` endpoint's exact functionality beyond \"Premium API Access\" is not documented — it may serve as a general-purpose gateway or a specific resource. The docs, pricing, and API pages behind the site require a wallet connection and provide no further detail in the crawl.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. It accepts POST requests, settles in USDC on Base (asset contract `0x8335…2913`), and has a 300-second payment timeout. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl.","tags":[],"capabilities":["x402-payment-gated","pay-per-request","usdc-settlement","base-network","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality behind 'Premium API Access' at /api/v1/payments/201 is undocumented","All docs, pricing, and API pages require wallet connection and returned no useful content in the crawl","No request or response examples could be determined"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/201","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/payments/201","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 challenge, but there is no OpenAPI schema, no request/response examples, and the docs/pricing/API pages are empty behind a wallet-connect gate. The exact functionality of this specific endpoint is unclear beyond its label. Effectively a stub 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'list':147 'live':208 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':119 'maximum':67 'may':172 'metric':113 'micropayment API' 'network':52 'no-api-key' 'no-rate-limit' 'on-chain':85 'openapi':244 'page':189 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':38 'payment':64,82,241 'per':3,13,19,29,40,71,152 'platform':105 'point':155 'post':225 'post-method' 'premium':5,21,58,165 'price':129,154,186 'protocol':48,222 'provid':198 'purpos':178 'quot':134 'rate':97,132 'report':114 'request':14,30,41,153,226 'request/response':246 'requir':102,193 'resourc':183 'return':210 'schema':245 'second':240 'sentiment':121 'serv':173 'settl':84,227 'site':192 'specif':158,182 'specifi':90 'summar':124 'text':123 'timeout':242 'token':133 'unit':76 'upfront':100 'usdc':16,32,63,78,229 'usdc-settlement' 'util':139 'valid':141,212 'version':218 'via':10,26 'wallet':91,195 'web3':128 'x402':11,27,47,213 'x402 API' 'x402-payment-gated'","prices":[{"id":"75585891-852b-4a58-ae4a-591f6442d13a","listingId":"d3d9f964-61bc-4843-be8c-edd7b939e705","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/payments/201","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:45.621Z"}],"sources":[{"listingId":"d3d9f964-61bc-4843-be8c-edd7b939e705","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/201","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:45.621Z","lastSeenAt":"2026-04-23T16:02:28.110Z"}],"details":{"listingId":"d3d9f964-61bc-4843-be8c-edd7b939e705","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/201 \\\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 valid x402 challenge with HTTP 402, version 1, on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/201"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/201"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/201"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain USDC micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.97Z"},"updatedAt":"2026-04-23T16:02:28.110Z"}}