{"id":"1c477c98-4ded-4e59-85c2-2dc518103a94","shortId":"pEPxZy","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (specifically for transaction ID 152) behind an x402 paywall. The provider operates a broader platform offering multiple API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol. 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 specific endpoint `/api/v1/transactions/152/receipt` accepts POST requests and returns application/json. The x402 challenge confirms the asset is USDC (contract 0x8335…2913 on Base) with a maxAmountRequired of 20000 base units, which equals $0.02 (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The endpoint is live (returning a proper 402 challenge), but the lack of documentation makes it difficult to know exactly what data the receipt includes or what input parameters the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","Docs, API, pricing, and README pages all render only 'Connect wallet' with no substantive content","This endpoint is scoped to a single transaction ID (152); unclear if other transaction IDs are available at similar paths","The broader platform advertises many API categories (AI, analytics, finance, utilities) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/152/receipt","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/transactions/152/receipt","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response schema, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The specific purpose of a 'transaction 152 receipt' is unexplained. This is effectively a stub 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'0.02':10,24,70,141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':128 '152':42 '20000':136 '2913':129 '300':155 '402':209 '6':144 'Base network API' 'USDC micropayment API' 'accept':113 'actual':200 'address':151 'ai':59 'analyt':58 'api':55,86,167 'application/json':118 'asset':124 'attach':97 'base':8,22,79,131,137 'base-network' 'behind':43 'bodi':233 'broader':51 'caller':95 'categori':56 'challeng':121,210 'commit':92 'confirm':122 'connect':176 'contain':201 'content':182 'contract':127 'data':57,223 'decim':145 'difficult':218 'doc':166 'document':158,191,215 'endpoint':6,20,30,111,203 'equal':140 'exact':221 'exampl':194 'expect':234 'extrem':163 'financ':62 'gate':3,17 'header':102 'id':41 'includ':226 'infrastructur':65 'input':229 'key':87 'know':220 'lack':213 'learn':61 'limit':89 'live':205 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':60 'make':216 'maxamountrequir':134 'multipl':54 'network':80 'no-api-key' 'offer':53 'openapi':186 'oper':49 'page':171 'paramet':230 'pay':9,23 'pay-per-call API' 'pay-per-request' 'payload':199 'payment':101,107,147 'paywal':46 'per':13,27,71 'platform':52 'post':114,232 'price':68,168 'prompt':178 'proof':108 'proper':208 'protocol':84 'provid':33,48 'rate':88 'readm':170 'receipt':5,19,36,198,225 'render':173 'request':14,28,72,115 'request/response':189 'requir':94 'resourc':37 'return':117,206 'schema':190 'second':156 'sent':149 'settl':74 'simpli':96 'site':161 'spec':187 'specif':38,110 'substant':181 'thin':164 'timeout':157 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'unit':138 'upfront':91 'usdc':12,26,76,126,142 'usdc-settlement' 'use':143 'util':66 'valid':105 'via':81 'wallet':177 'web3':63 'x':100 'x-payment':99 'x402':2,16,45,83,106,120 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a6701f36-6975-46f6-8d0f-1286131283c8","listingId":"1c477c98-4ded-4e59-85c2-2dc518103a94","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/transactions/152/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:41.848Z"}],"sources":[{"listingId":"1c477c98-4ded-4e59-85c2-2dc518103a94","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/152/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:41.848Z","lastSeenAt":"2026-04-24T22:32:56.343Z"}],"details":{"listingId":"1c477c98-4ded-4e59-85c2-2dc518103a94","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/152/receipt \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/152/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/152/receipt"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 152 via programmatic x402 payment","Demonstrating x402 protocol integration for pay-per-request APIs","Agents autonomously purchasing transaction data without API key provisioning"],"bestFor":["Developers experimenting with x402 protocol payments on Base","Agents that need to fetch transaction receipts without pre-registration","Low-friction, keyless API access settled in USDC"],"notFor":["Bulk retrieval of many different transaction receipts (only transaction 152 is documented at this endpoint)","Users who need detailed API documentation or response schema guarantees before integrating","Non-crypto workflows that cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.312Z"},"updatedAt":"2026-04-24T22:32:56.343Z"}}