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Northline x402 Pricing Description Checklist
x402
Northline x402 Pricing Description Checklist is a paid API for AI agents from 206-81-14-131.sslip.io, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-01).
Downloads a Markdown checklist document describing how to write effective x402 pricing descriptions for pay-per-call API endpoints
Price / call$0.25
Success—
StatusUnknown
How this service works
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
Output
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.
Example use cases
Validating an x402 API listing description
“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?”
Learning x402 monetization best practices
“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?”
Auditing existing x402 endpoint descriptions
“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?”
Technical details
Endpoint
GEThttps://206-81-14-131.sslip.io/svc/x402-pricing-description-checklist/dl/x402-pricing-description-checklist.md?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Output
Schema · Response
{
"type": "file",
"format": "text/markdown; charset=utf-8"
}Tags
x402
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