{"id":"c2dcdb3e-5c16-4af0-80aa-80d5c138c46a","shortId":"ujSyva","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 gated by the x402 protocol. The specific endpoint at `/api/v1/charges/107` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network in USDC (contract 0x8335…2913) with a maximum charge 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.\n\nDocumentation 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 crawled material. The specific functionality behind the `/api/v1/charges/107` \"Premium API Access\" endpoint is unclear and may be a generic or demonstration endpoint rather than a distinct service.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay per call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet'","The specific functionality of /api/v1/charges/107 ('Premium API Access') is not described anywhere; it may be a generic or demo endpoint","No request body schema or response schema is documented, making integration difficult without trial and error","The broader platform lists many endpoint categories (AI, finance, data, etc.) but none have documented inputs or outputs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/107","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/charges/107","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/charges/107 is undefined. This is effectively a stub 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'/api/v1/charges/107':51,212 '/docs':171 '/pricing':173 '/readme':175 '/request':13,28,164 '0.02':12,27,84,163 '000':79 '0x8335':71 '20':78 '2913':72 '6':89 'Base network API' 'USDC micropayment API' 'accept':58 'access':7,22,56,215 'across':121 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':6,21,40,55,92,214 'attach':103 'avail':202 'base':9,24,66,80 'base-network' 'behind':210 'broader':116 'call':4,19 'caller':101 'categori':123 'charg':76 'classif':138 'collect':34 'commit':98 'connect':181 'contract':70 'convers':155 'crawl':205 'crypto-paid API' 'data':124,128 'decim':90 'demonstr':225 'detail':188 'distinct':230 'document':166,197 'embed':139 'endpoint':41,49,120,159,216,226 'equal':83 'estim':149 'exampl':201 'exchang':144 'export':129 'extrem':168 'feed':143 'financ':140 'four':122 'function':209 'gas':148 'gate':42 'generat':156 'generic':223 'geocod':153 'header':108 'host':32 'infrastructur':151 'insight':130 'key':93 'label':53 'learn':133 'limit':95 'list':158 'lowpaymentfee' 'lowpaymentfee.com':31,117 'machin':132 'materi':206 'maximum':75 'may':220 'metric':126 'network':67 'no-api-key' 'openapi':192 'page':176 'pay':2,17,37 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':36 'payment':61,107,113 'per':3,18,38,85 'platform':118 'post':59 'post-endpoint' 'premium':5,20,54,213 'premium API access' 'price':142,165 'prompt':183 'proof':114 'protocol':46 'quot':147 'rate':94,145 'rather':227 'render':178 'report':127 'request':39,60,86 'request/response':195 'requir':100 'schema':196 'sentiment':134 'servic':231 'settl':63 'share':160 'simpli':102 'spars':169 'spec':193 'specif':48,208 'summar':137 'technic':187 'text':136 'token':146 'unclear':218 'unit':81 'upfront':97 'usag':200 'usdc':15,30,69,87 'usdc-settlement' 'use':88 'util':152 'valid':111,154 'via':10,25 'wallet':182 'web3':141 'x':106 'x-payment':105 'x402':11,26,45,112 'x402 API' 'x402-payment'","prices":[{"id":"2ffdb070-80df-479c-9a1e-32eb937a0ed8","listingId":"c2dcdb3e-5c16-4af0-80aa-80d5c138c46a","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/charges/107","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:07.352Z"}],"sources":[{"listingId":"c2dcdb3e-5c16-4af0-80aa-80d5c138c46a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/107","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:07.352Z","lastSeenAt":"2026-04-24T06:32:01.091Z"}],"details":{"listingId":"c2dcdb3e-5c16-4af0-80aa-80d5c138c46a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/107 \\\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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/107"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/107"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-request API services without needing API keys or subscriptions","Integrating x402-compatible agents with low-cost per-call endpoints on Base","Programmatic access to data, AI, finance, or utility endpoints with USDC micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","x402-compatible AI agents that need low-cost endpoint calls","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring high-throughput with predictable flat-rate pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.286Z"},"updatedAt":"2026-04-24T06:32:01.091Z"}}