{"id":"6931151c-601a-43ad-9d36-4fe330dcb8f2","shortId":"pHGpyC","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/102` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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, the documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" stub with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live and returns a valid 402 challenge, but without documentation it is unclear what request body the `/api/v1/transactions/102` endpoint expects or what response it returns. The \"Premium API Access\" label is generic and does not describe the actual functionality of this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'","The specific functionality of /api/v1/transactions/102 ('Premium API Access') is undocumented and unclear","No example request or response payloads are available anywhere in the crawled material","The platform lists many endpoints but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/102","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/102","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, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect stub, and the endpoint name 'Premium API Access' is entirely generic with no indication of what it actually does. This is effectively a stub 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'/request':13,28,154 '0.02':12,27,75,153 '000':70 '20':69 '402':199 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':61,90,222 'across':110 'actual':231 'advertis':81 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,60,83,221 'attach':93 'avail':190 'base':8,23,51,71 'bodi':209 'broader':106 'call':4,19,78 'caller':91 'categori':112 'challeng':200 'classif':127 'connect':169 'convers':144 'crypto-paid API' 'data':113,117 'describ':229 'detail':176 'doc':161 'document':159,185,203 'embed':128 'endpoint':55,109,147,192,212,236 'estim':138 'exampl':188 'exchang':133 'expect':213 'export':118 'feed':132 'financ':129 'four':111 'function':232 'gas':137 'generat':145 'generic':225 'geocod':142 'header':98 'howev':157 'http-post' 'infrastructur':140 'insight':119 'instant':89 'key':84 'label':58,223 'learn':122 'limit':87 'list':149 'live':194 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'minim':168 'network':9,24,52 'no-api-key' 'offer':108 'openapi':180 'page':160 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':189 'payment':48,65,97,103 'per':3,18,36,77 'platform':6,21,39,80,107 'point':156 'premium':59,220 'price':131,155,162 'proof':104 'protocol':44 'quot':136 'rate':86,134 'readm':163 'report':116 'request':37,208 'request/response':183 'requir':63 'resolv':165 'respons':216 'return':196,218 'schema':184 'sentiment':123 'simpli':92 'spec':181 'specif':54,235 'stub':171 'summar':126 'technic':175 'text':125 'token':135 'unclear':206 'unit':72 'usd':76 'usdc':15,30,47,74 'usdc-base-network' 'use':41 'util':141 'valid':101,143,198 'via':10,25 'wallet':170 'web3':130 'without':202 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"a126a57d-cabf-451a-9e8a-045448ad202b","listingId":"6931151c-601a-43ad-9d36-4fe330dcb8f2","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:11.304Z"}],"sources":[{"listingId":"6931151c-601a-43ad-9d36-4fe330dcb8f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/102","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:11.304Z","lastSeenAt":"2026-04-25T03:03:29.946Z"}],"details":{"listingId":"6931151c-601a-43ad-9d36-4fe330dcb8f2","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to auto-negotiate payment.\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/102 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","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 (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/102"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages resolve to minimal 'Connect wallet' stubs","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making one-off API calls settled in USDC on Base L2","Agent-driven workflows that need instant, keyless API access"],"bestFor":["Developers who want to pay per request without subscriptions","AI agents with x402-compatible wallets on Base network","Quick prototyping without account signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where subscription pricing would be cheaper","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.695Z"},"updatedAt":"2026-04-25T03:03:29.946Z"}}