{"id":"6861656a-c1a1-45db-a6e4-bbb142b65c9d","shortId":"mDZDm9","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/31` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\n\nThe platform advertises four endpoint 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 per-request pricing. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live.\n\nNote that the specific endpoint being listed here (`/api/v1/inbox/31`) does not correspond to any of the named endpoints on the landing page, and no documentation, OpenAPI schema, or example payloads are available for it. Its actual functionality is unknown beyond the generic \"Premium API Access\" label. Callers should treat this as an opaque POST endpoint until further documentation is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["Endpoint /api/v1/inbox/31 does not match any named endpoint on the provider's landing page — its actual functionality is unknown.","No OpenAPI spec, input schema, or output schema is available for this endpoint.","No example requests or responses are documented anywhere in the crawled material.","The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/31","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/inbox/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing, but the specific endpoint /api/v1/inbox/31 has no documentation, no OpenAPI schema, no example request/response, and its purpose ('Premium API Access') is entirely generic. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':19,38 '0.02':18,37,79,157 '000':83 '1':170 '20':82 '402 payment required' '6':89 'access':74,223 'actual':214 'advertis':114 'ai':12,31,125 'analysi':129 'analyt':119 'api':5,24,45,73,92,222 'attach':103 'avail':210 'base':8,27,63,84 'base network api' 'beyond':218 'broad':50 'call':4,23 'caller':101,225 'captur':167 'catalog':51 'categori':117 'challeng':164 'classif':132 'commit':98 'confirm':174 'convers':149 'correspond':190 'cost':76 'cover':10,29 'data':11,30,118,122 'decim':90 'document':203,236 'embed':133 'enabl':44 'endpoint':16,35,57,67,116,153,176,183,196,233 'estim':143 'exampl':207 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'four':115 'function':215 'gas':142 'generat':150 'generic':220 'geocod':147 'header':107 'infrastructur':145 'insight':124 'key':93 'label':224 'land':199 'learn':127 'limit':95 'list':70,152,185 'live':178 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'metric':120 'micropayment api' 'name':195 'network':64 'no-api-key' 'no-rate-limit' 'note':179 'offer':48 'opaqu':231 'openapi':204 'page':200 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':208 'payment':106 'per':3,22,55,80,159 'per-request':158 'platform':6,25,46,113 'post':110,232 'post-endpoint' 'premium':72,221 'price':136,161 'protocol':173 'provid':238 'quot':141 'rate':94,139 'report':121 'request':56,81,111,160 'requir':100 'schema':205 'sentiment':128 'settl':58 'share':154 'simpli':102 'specif':66,182 'success':166 'summar':131 'text':130 'token':140 'treat':227 'unit':85 'unknown':217 'upfront':97 'usdc':9,28,60,87 'usdc api' 'usdc-base' 'util':15,34,146 'valid':148 'version':169 'web3':135 'x402':43,105,163 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"956e7b30-f167-4643-a339-2160153348c3","listingId":"6861656a-c1a1-45db-a6e4-bbb142b65c9d","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/inbox/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.372Z"}],"sources":[{"listingId":"6861656a-c1a1-45db-a6e4-bbb142b65c9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.372Z","lastSeenAt":"2026-04-22T04:02:45.761Z"}],"details":{"listingId":"6861656a-c1a1-45db-a6e4-bbb142b65c9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/31"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/31"},{"claim":"All listed 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 across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an undocumented premium endpoint via x402 micropayment","Agent-driven API consumption without pre-registration or API keys","Exploring a multi-category API catalog (data, AI, finance, utilities) with per-call USDC settlement"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Low-volume or experimental use cases where $0.02/call is acceptable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","High-volume production workloads where per-call crypto settlement adds overhead","Anyone needing to understand the exact input/output schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.455Z"},"updatedAt":"2026-04-22T04:02:45.761Z"}}