{"id":"1c30bcc7-8554-4eec-b96f-e97cbbe8728f","shortId":"YXXQbS","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/wire/57` 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 — 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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/wire/57`) does not have detailed documentation beyond the generic \"Premium API Access\" label. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI schema, request/response examples, or documentation describing what this specific endpoint returns, its exact functionality remains unclear. Callers should be aware that the endpoint accepts POST requests and returns `application/json`, but the input parameters and output structure are not documented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","post-method"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","402 payment api"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no useful content","The specific functionality of /api/v1/wire/57 ('Premium API Access') is completely undocumented","No OpenAPI schema or input/output examples are provided","No request body schema is documented; callers must guess at required parameters"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/57","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/wire/57","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 schema, no request/response examples, and no documentation describing what '/api/v1/wire/57' actually does beyond the generic label 'Premium API Access'. All doc pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 '402 payment api' 'accept':46,216 'access':62,92,170 'across':112 'addit':188 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,169 'application/json':221 'attach':95 'awar':212 'base':8,23,51,73 'base network api' 'beyond':165 'broader':108 'call':4,19,80 'caller':93,209 'categori':114 'challeng':67 'classif':129 'connect':183 'content':189 'convers':146 'crawl':173 'data':115,119 'describ':198 'detail':163 'doc':174 'document':164,197,231 'embed':130 'endpoint':55,111,149,158,202,215 'estim':140 'exact':205 'exampl':195 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':206 'gas':139 'generat':147 'generic':167 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'input':224 'insight':121 'instant':91 'json-api' 'key':86 'label':171 'learn':124 'limit':89 'list':58 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'offer':110 'openapi':192 'output':227 'page':178 'paramet':225 'particular':157 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'post':217 'post-method' 'premium':60,168 'price':133,151,175 'prompt':185 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':177 'remain':207 'report':118 'request':37,68,155,218 'request/response':194 'return':64,180,203,220 'schema':193 'sentiment':125 'simpli':94 'specif':54,201 'structur':228 'summar':128 'text':127 'token':137 'unclear':208 'unit':74 'usdc':15,30,47,76 'usdc api access' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':184 'web3':132 'without':190 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"2bf4fe9d-1ae9-4e35-a7b6-7a10772bd33c","listingId":"1c30bcc7-8554-4eec-b96f-e97cbbe8728f","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/wire/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:06.495Z"}],"sources":[{"listingId":"1c30bcc7-8554-4eec-b96f-e97cbbe8728f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:06.495Z","lastSeenAt":"2026-04-22T02:31:41.494Z"}],"details":{"listingId":"1c30bcc7-8554-4eec-b96f-e97cbbe8728f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/57 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/57"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/57"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 protocol payment flows on the Base network"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.255Z"},"updatedAt":"2026-04-22T02:31:41.494Z"}}