{"id":"1e294986-c3f6-4f93-9d89-25f4dba94d9d","shortId":"5bbrnC","kind":"x402","title":"x402 pay-per-call API suite on Base — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402 pay-per-call API suite on Base — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a collection of x402-protocol APIs that accept per-request micropayments in USDC on the Base network. The site 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/nfts/88` is listed as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" payment scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nNote: The `/api/v1/nfts/88` path suggests NFT-related data, but no further documentation describes the request body schema or response format. The site's docs, pricing, and README pages all resolve to a wallet-connect stub with no additional content. Without an OpenAPI spec, example payloads, or detailed documentation, the exact functionality of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","json-response","nft-data"],"categories":["web3","data"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","NFT API","lowpaymentfee","402 payment endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/nfts/88 path purpose is undocumented — 'Premium API Access' is the only description","Docs, pricing, and README pages all resolve to a wallet-connect stub with no content","Request body format and response structure are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/88","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/nfts/88","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, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the NFT-specific endpoint purpose is unexplained. Effectively a stub 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'/request':18,36 '0.02':17,35,103,148 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '0x8335':142 '20':136 '2913':143 '300':162 '402 payment endpoint' '6':146 'Base network API' 'NFT API' 'USDC pay-per-call' 'accept':47,167 'access':126 'across':62 'addit':212 'address':158 'advertis':60 'ai':11,29,72 'analysi':76 'analyt':66 'api':6,24,45,108,125 'application/json':172 'base':9,27,56,138,145 'base-network' 'bodi':189 'call':5,23 'categori':64 'challeng':132 'classif':79 'collect':40 'commit':116 'connect':208 'content':213 'convers':96 'data':10,28,65,69,181 'decim':147 'describ':186 'detail':221 'doc':197 'document':185,222 'embed':80 'endpoint':15,33,61,99,119,166,228 'estim':90 'exact':151,224 'exampl':218 'exchang':85 'export':70 'feed':84 'financ':12,30,81 'format':193 'four':63 'function':225 'gas':89 'generat':97 'geocod':94 'http':168 'infrastructur':92 'insight':71 'json-response' 'key':109 'learn':74 'limit':112 'list':122 'live':130 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':73 'metric':67 'micropay':51 'micropayment API' 'minimum':115 'network':57 'nft':179 'nft-data' 'nft-relat':178 'no-api-key' 'note':173 'openapi':216 'page':201 'path':176 'pay':3,21 'pay-per-cal':2,20 'pay-per-request' 'payload':219 'payment':152,154 'per':4,22,49,104 'per-request':48 'post':169 'premium':124 'price':83,101,198 'protocol':44 'quot':88 'rate':86,111 'readm':200 'relat':180 'remain':229 'report':68 'request':50,105,133,188 'resolv':203 'respons':192 'return':128,171 'schema':190 'scheme':153 'second':163 'sent':156 'sentiment':75 'site':59,195 'spec':217 'specif':118 'stub':209 'suggest':177 'suit':7,25 'summar':78 'text':77 'timeout':164 'token':87 'unclear':230 'unit':139 'usdc':53,141 'usdc-micropayment' 'util':14,32,93 'valid':95 'via':149 'wallet':207 'wallet-connect':206 'web3':82 'without':214 'x402':1,19,43,131 'x402 API' 'x402-payment' 'x402-protocol':42","prices":[{"id":"b8d0f16f-11c8-4b8e-81de-02336d449fc2","listingId":"1e294986-c3f6-4f93-9d89-25f4dba94d9d","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/nfts/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.735Z"}],"sources":[{"listingId":"1e294986-c3f6-4f93-9d89-25f4dba94d9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.735Z","lastSeenAt":"2026-04-22T02:32:10.149Z"}],"details":{"listingId":"1e294986-c3f6-4f93-9d89-25f4dba94d9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/88 \\\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 endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/88"},{"claim":"Site lists four API categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic agents paying per-call for NFT or premium data without managing API keys","Integrating low-cost micropayment-gated endpoints into autonomous workflows","Accessing on-demand data feeds settled instantly in USDC on Base"],"bestFor":["Developers or agents wanting key-free, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["High-volume consumers needing bulk/subscription pricing","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.174Z"},"updatedAt":"2026-04-22T02:32:10.149Z"}}