{"id":"e7a86c3e-ac0a-4c18-b6a3-013e8614dda0","shortId":"t9rys2","kind":"x402","title":"SendGrid integration token via x402 micropayment on Base for $0.02 per request.","tagline":"SendGrid integration token via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a SendGrid integration token accessible through the x402 payment protocol. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML, finance, and infrastructure categories, all settled on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns an application/json response. Payment is handled via the x402 exact-payment scheme: callers attach an X-PAYMENT header with a USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The platform advertises no API keys, no rate limits, and instant access — you pay per request with no minimums or commitments.\n\nThe specific functionality of this endpoint — what the returned \"token\" enables or represents in the context of SendGrid — is not documented in the available crawl material. It likely provisions or returns a SendGrid API token or session credential, but this is inferred from the URL path rather than confirmed by documentation. No OpenAPI schema, request body specification, or response examples are provided.","tags":[],"capabilities":["x402-payment","usdc-base","sendgrid-integration","pay-per-request","no-api-key"],"categories":["integrations","email"],"synonyms":["sendgrid token","email api token","sendgrid integration","lowpaymentfee sendgrid","x402 sendgrid","micropayment email api"],"warnings":["No documentation on what the SendGrid token response contains or how to use it","No OpenAPI or request/response schema available","Exact functionality (token provisioning, session creation, etc.) is inferred from URL path only","Other crawled pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/token","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/integrations/sendgrid/token","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on request body, response format, or what the SendGrid token actually provides. No OpenAPI schema or examples exist. The listing is effectively a stub with confirmed 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'000':110 '20':109 '6':115 'accept':71 'access':34,132 'across':53 'advertis':123 'ai/ml':56 'amount':104 'analyt':55 'api':52,125,175 'application/json':77 'attach':90 'avail':165 'base':8,20,65,101,111 'bodi':197 'broader':45 'call':51,107 'caller':89 'categori':60 'commit':141 'confirm':190 'context':157 'crawl':166 'credenti':179 'data':54 'decim':116 'document':162,192 'email api token' 'enabl':152 'endpoint':26,70,147 'equal':118 'exact':86 'exact-pay':85 'exampl':201 'financ':57 'function':144 'handl':81 'header':95 'infer':183 'infrastructur':59 'instant':131 'integr':2,14,32 'key':126 'like':169 'limit':129 'lowpaymentfee sendgrid' 'lowpaymentfee.com':28 'materi':167 'maximum':103 'micropay':6,18 'micropayment email api' 'minimum':139 'network':66 'no-api-key' 'offer':47 'openapi':194 'part':42 'path':187 'pay':49,134 'pay-per-cal':48 'pay-per-request' 'payment':38,79,87,94,99 'per':11,23,50,106,135 'platform':46,122 'post':72 'protocol':39 'provid':29,203 'provis':170 'rate':128 'rather':188 'repres':154 'request':12,24,73,136,196 'requir':105 'respons':78,200 'return':75,150,172 'schema':195 'scheme':88 'sendgrid':1,13,31,159,174 'sendgrid integration' 'sendgrid token' 'sendgrid-integration' 'session':178 'settl':62 'specif':143,198 'token':3,15,33,151,176 'unit':112 'url':186 'usd':120 'usdc':68,98,114 'usdc-base' 'use':67 'via':4,16,82 'x':93 'x-payment':92 'x402':5,17,37,84 'x402 sendgrid' 'x402-payment'","prices":[{"id":"7df41982-e1d0-47d7-89b5-9b28151d0abe","listingId":"e7a86c3e-ac0a-4c18-b6a3-013e8614dda0","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/integrations/sendgrid/token","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.397Z"}],"sources":[{"listingId":"e7a86c3e-ac0a-4c18-b6a3-013e8614dda0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/token","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.397Z","lastSeenAt":"2026-04-22T02:32:02.864Z"}],"details":{"listingId":"e7a86c3e-ac0a-4c18-b6a3-013e8614dda0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/integrations/sendgrid/token \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/token"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/integrations/sendgrid/token"}],"useCases":["Obtaining a SendGrid integration token without traditional API key signup","Programmatic access to SendGrid services via pay-per-call micropayments","Agent-driven email workflows that need on-demand SendGrid credentials"],"bestFor":["Agents or services needing ephemeral SendGrid tokens without account management","Developers who want to pay per use with crypto (USDC on Base)","Low-volume or bursty email integration needs"],"notFor":["High-volume email sending where a direct SendGrid subscription is cheaper","Users who need detailed documentation or guaranteed SLAs","Non-crypto users who cannot settle payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.894Z"},"updatedAt":"2026-04-22T02:32:02.864Z"}}