{"id":"f3f35a5b-b11f-44c1-a34c-07564780863c","shortId":"9CwGhB","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/35` 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. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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/request price point.\n\nHowever, documentation 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 functionality of the `/api/v1/transactions/35` endpoint beyond its title \"Premium API Access\" is unclear — it could be a transaction lookup, a transaction creation endpoint, or something else entirely. The endpoint is live and responding with a valid x402 challenge, but without documentation it is difficult to know what data to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payment","402 payment protocol"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/35 ('Premium API Access') is undocumented — unclear what it does or what request body it expects","No example request or response payloads available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/35","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/transactions/35","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 challenge, confirming it accepts $0.02 USDC on Base. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The specific purpose of /api/v1/transactions/35 is undocumented. This is effectively a stub 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,205 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,162,204 'attach':95 'avail':192 'base':8,23,51,73 'beyond':200 'broader':104 'call':4,19,80 'categori':110 'challeng':67,232 'classif':125 'connect':171 'convers':142 'could':209 'creation':216 'crypto API payment' 'data':111,115,242 'detail':178 'difficult':238 'doc':161 'document':156,187,235 'els':220 'embed':126 'endpoint':55,107,145,199,217,223 'entir':221 'estim':136 'exampl':190 'exchang':131 'expect':249 'export':116 'extrem':158 'feed':130 'financ':127 'four':109 'function':195 'gas':135 'generat':143 'geocod':140 'header':99 'howev':155 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'know':240 'learn':120 'limit':89 'list':58,147 'live':225 'lookup':213 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':182 'page':166 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':191 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60,203 'price':129,153,163 'prompt':173 'protocol':44 'quot':134 'rate':88,132 'readm':165 'render':168 'report':114 'request':37,68,102 'request/response':185 'respond':227 'respons':247 'return':64 'schema':186 'send':244 'sentiment':121 'simpli':94 'someth':219 'spars':159 'spec':183 'specif':54,194 'summar':124 'technic':177 'text':123 'titl':202 'token':133 'transact':212,215 'unclear':207 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,230 'via':10,25 'wallet':172 'web3':128 'without':234 'x402':11,26,43,97,231 'x402 API' 'x402-payment'","prices":[{"id":"d94e52e2-1c68-4b84-b4f2-52b524fe9876","listingId":"f3f35a5b-b11f-44c1-a34c-07564780863c","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/transactions/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:17.424Z"}],"sources":[{"listingId":"f3f35a5b-b11f-44c1-a34c-07564780863c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:17.424Z","lastSeenAt":"2026-04-23T11:31:27.587Z"}],"details":{"listingId":"f3f35a5b-b11f-44c1-a34c-07564780863c","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. Send a POST without payment to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/35\n# 2. Parse the 402 JSON challenge, construct an X-PAYMENT header\n#    with a signed USDC transfer of 0.02 USDC, then retry:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/35 \\\n  -H \"X-PAYMENT: <signed-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/transactions/35"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/35"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers not set up to make USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.338Z"},"updatedAt":"2026-04-23T11:31:27.587Z"}}