{"uid":"cap_2Ee23RebBTFHnKFtPXaVo","slug":"northline-x402-pricing-description-checklist-cbd92f7a","name":"Northline x402 Pricing Description Checklist","description":"Pay-per-call APIs, paid downloads and work-on-request for agents. Payment: x402 (USDC on Base, eip155:8453), no accounts or API keys. Catalog: https://206-81-14-131.sslip.io/?format=json. Agent guide: https://206-81-14-131.sslip.io/llms.txt","url":"https://206-81-14-131.sslip.io/svc/x402-pricing-description-checklist/dl/x402-pricing-description-checklist.md?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":null,"responseSchema":{"type":"file","format":"text/markdown; charset=utf-8"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.25","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.25/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ueH6sfIR4OffEM9WYQ5dk","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.25","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Downloads a Markdown checklist document describing how to write effective x402 pricing descriptions for pay-per-call API endpoints","exampleAgentPrompt":"Can you fetch the x402 pricing description checklist from Northline so I can see what fields and guidelines I need to follow when writing pricing descriptions for my pay-per-call API endpoints?","exampleUseCases":[{"title":"Validating an x402 API listing description","prompt":"I'm about to publish a new pay-per-call API with x402 pricing — can you download the Northline pricing description checklist so I can check whether my listing description covers everything it should?"},{"title":"Learning x402 monetization best practices","prompt":"I want to understand what makes a good x402 API pricing description for AI agents — can you grab that checklist document from Northline so I can read through the guidelines?"},{"title":"Auditing existing x402 endpoint descriptions","prompt":"I have a bunch of x402 API endpoints already listed and I want to audit their descriptions for completeness — can you pull down the Northline pricing description checklist so I know what criteria to check them against?"}],"resultDescription":"A Markdown-formatted checklist document covering best practices, required fields, and guidelines for writing effective x402 API pricing descriptions that are readable and useful to AI agents and developers discovering pay-per-call endpoints.","failureModes":["Payment not received or rejected — endpoint returns 402 requiring USDC payment on Base before content is delivered","Network or server unavailability — host at 206-81-14-131.sslip.io may be unreachable","Incorrect payment amount — sending less than $0.25 USDC results in payment rejection","Malformed x402 payment header — agent fails to construct a valid x402 payment, resulting in 402 error"],"whenToPreferThis":"Choose this endpoint when you need authoritative guidance on structuring x402 pricing descriptions for pay-per-call APIs — particularly when building or auditing Northline-listed endpoints. It is the canonical reference document for x402 monetization description standards on this platform. Prefer it over generic API documentation guides when your specific context involves x402/USDC payment integration and agent-discoverable endpoint metadata.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T12:47:18.844Z","isFirstParty":false,"canonicalSlug":"northline-x402-pricing-description-checklist-cbd92f7a"}