{"id":"8295edc4-3d46-4775-a569-baf64e86be39","shortId":"3dBpAp","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/312` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com 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 listed endpoints share the same $0.02/request pricing model.\n\nDocumentation beyond the landing page 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 usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what request body to send or what response to expect from this particular endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API access","Base network API","low fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request/response format is unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/payments/312 ('Premium API Access') is not described anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/312","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/312","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality behind 'Premium API Access' at /payments/312 is undefined — it's essentially a stub 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'/api/v1/payments/312':56 '/docs':179 '/pricing':181 '/readme':183 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':222 '6':92 'Base network API' 'USDC API access' 'accept':63 'access':7,22,42,61 'across':124 'advertis':122 'ai':134 'amount':79 'analysi':138 'analyt':128 'api':6,21,40,60,95 'attach':106 'avail':210 'base':9,24,50,75,83 'base-network' 'beyond':171 'bodi':236 'broader':119 'call':4,19 'caller':104 'categori':126 'challeng':223 'classif':141 'collect':34 'commit':101 'confirm':217 'connect':189 'contract':71 'convers':158 'crawl':213 'crypto-paid API' 'data':127,131 'decim':93 'detail':196 'difficult':231 'document':170,205,228 'embed':142 'endpoint':41,54,123,162,215,247 'equal':86 'estim':152 'exampl':209 'exchang':147 'expect':243 'export':132 'extrem':176 'feed':146 'financ':143 'four':125 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'infrastructur':154 'insight':133 'key':96 'know':233 'label':58 'lack':226 'land':173 'learn':136 'limit':98 'list':161 'live':218 'low fee API' 'lowpaymentfee.com':31,120 'machin':135 'make':229 'maximum':78 'metric':129 'micropayment API' 'model':169 'network':51 'no-api-key' 'no-rate-limit' 'openapi':200 'page':174,184 'particular':246 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116 'per':3,18,38,88 'platform':121 'post':64 'post-endpoint' 'premium':5,20,59 'price':145,168 'prompt':191 'proof':117 'proper':221 'protocol':47 'quot':150 'rate':97,148 'render':186 'report':130 'request':39,65,89,235 'request/response':203 'requir':103 'respons':241 'return':219 'schema':204 'send':238 'sentiment':137 'settl':68 'share':163 'simpli':105 'spars':177 'spec':201 'specif':53 'summar':140 'technic':195 'text':139 'token':149 'unit':84 'upfront':100 'usag':208 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':190 'web3':144 'x':109 'x-payment':108 'x402':11,26,45,115 'x402 API' 'x402-payment'","prices":[{"id":"26b0639e-0829-475c-81ad-5d6c12081822","listingId":"8295edc4-3d46-4775-a569-baf64e86be39","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/312","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:16.852Z"}],"sources":[{"listingId":"8295edc4-3d46-4775-a569-baf64e86be39","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/312","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:16.852Z","lastSeenAt":"2026-04-23T12:31:28.217Z"}],"details":{"listingId":"8295edc4-3d46-4775-a569-baf64e86be39","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/312 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/payments/312"},{"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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/312"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access without subscriptions","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can autonomously pay for API calls via crypto","Users who want pay-as-you-go access without signup or API keys"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.522Z"},"updatedAt":"2026-04-23T12:31:28.217Z"}}