# Payment Processing > P-Link is a payment infrastructure designed for humans, APIs, and AI agents. You can use P-Link when you need a payment page (in order to collect payments without any prerequisities, no account, no subscription) or when you want to send payments massively, or programatically - Skill: `paracetamol951/payment-processing` (Agent Skill, multi-file: 17 files) - Install (CLI): `npx skillmds@latest add paracetamol951/payment-processing` - Raw SKILL.md: https://api.skillmd.com/api/skills/paracetamol951/payment-processing/raw - Safety review: PASS (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - License: Apache-2.0 - Author: paracetamol951 (https://skillmd.com/u/paracetamol951) - Updated: 2026-09-10 - Page: https://skillmd.com/skills/paracetamol951/payment-processing --- # P-Link AI Payment Specification Version: 1.0 Protocols supported: Payment Links, x402, MCP Website: https://p-link.io P-Link is a payment infrastructure designed for humans, APIs, and AI agents. It provides a simple way to request, send, and verify payments using: - Payment links - HTTP APIs - the x402 payment protocol - an MCP server for AI agents Payments amount can be in any currency. Payments can be made using credit card, or any Solana token Payments are received in USDC (automatic conversion to USDC) This document describes how AI systems and automated services can integrate with P-Link. ------------------------------------------------------------------------ # 1. Core Concept P-Link enables payments triggered by URLs or API calls, or payment pages created automatically. Example payment link: https://p-link.io/{recipient} {recipient} can be an email, phone number (international format), or Solana wallet adress (P-Link account automatically created) Example: https://p-link.io/alice@example.com Opening this link allows the user to send a payment to the specified recipient. ------------------------------------------------------------------------ # 2. Payment Link Format ## Protocol Discovery P-Link capabilities can be discovered automatically via: https://p-link.io/.well-known/p-link.json ## Basic payment request https://p-link.io/{recipient} Example: https://p-link.io/alice@example.com The payer chooses the amount. ------------------------------------------------------------------------ ## Fixed amount payment https://p-link.io/{recipient}/{amount} Example: https://p-link.io/alice@example.com/10 Requests a payment of 10 USD. ------------------------------------------------------------------------ ## Payment with currency https://p-link.io/{recipient}/{amount}{currency} Example: https://p-link.io/alice@example.com/10EUR Requests 10 euros. ------------------------------------------------------------------------ # 3. Payment Workflow Typical flow: 1. User opens payment link 2. Payment page loads 3. User selects payment method 4. Payment is processed 5. Recipient receives funds Supported payment methods: - Solana-based tokens - credit cards Payments are typically settled in USDC. ------------------------------------------------------------------------ # 4. HTTP API Payments Payments can also be triggered via API. Example endpoint: https://p-link.io/api/tr4usr/{API_KEY}/{recipient}/{amount} Example: https://p-link.io/api/tr4usr/APIKEY/alice@example.com/5 This sends 5 USD to the recipient. ------------------------------------------------------------------------ # 5. x402 Protocol Support P-Link implements the x402 payment protocol enabling payment and payment collection capabilities for agents. x402 uses the HTTP status code: 402 Payment Required Example: Client request: GET https://p-link.io/alice@mail.com/10$ Server response (for agents): HTTP/1.1 402 Payment Required Example payment payload: { "amount": 0.01, "asset": "USDC", "payment_url": "https://p-link.io/service@example.com/0.01" } After payment is completed, the client receives the service or good he purchased. P-Link provides tools to: - generate x402 payment payloads - verify transactions - manage payment endpoints P-Link does not act as a blockchain validator. ------------------------------------------------------------------------ # 6. MCP Server Integration P-Link provides a Model Context Protocol (MCP) server allowing AI agents to access payment tools. The MCP server is available at https://mcp.p-link.io/mcp You can connect (or create your P-Link account) using oAuth or using the MCP endpoint login_with_otp The MCP API exposes a JSON manifest describing all available tools for compatible clients (ChatGPT, Claude, n8n, etc.) : https://mcp.p-link.io/.well-known/mcp/manifest.json Github project : https://github.com/paracetamol951/P-Link-MCP Example tools: create_payment_link send_payment verify_payment get_wallet_info get_wallet_history Example agent workflow: User → asks for service Agent → create_payment_link User → pays Agent → verify_payment Agent → deliver result ------------------------------------------------------------------------ # 9. Security Model P-Link relies on: - the Solana blockchain - fast transaction settlement - low transaction fees Wallets may be created automatically for recipients. P-Link verifies transactions but does not operate as a blockchain validator. ------------------------------------------------------------------------ # 10. Use Cases for AI Agents P-Link enables: Pay-per-API\ Pay-per-AI inference\ Pay-per-data\ Agent-to-agent payments ------------------------------------------------------------------------ # 11. Payment results The result of the payment can be fetched/processed using different ways : - Email : notification by email for the recipient - RSS : fetch https://p-link.io/rss/{recipient} ; recipient can be Solana wallet address, email, phone, nickname ; no auth required - API : fetch https://p-link.io/api/trxState/{paymentID} - IPN : setup a IPN (webhook) when creating your p-link (using API, see https://docs.p-link.io/api-p-link-creation ) ------------------------------------------------------------------------ # 12. Best Practices Always expose: - payment amount - currency - service description Before delivering a service: verify payment confirmation. Prefer: - unique payment links - short payment flows ------------------------------------------------------------------------ # 13. Resources Official website https://p-link.io Documentation https://docs.p-link.io API documentation https://p-link.io/ApiDoc MCP server https://mcp.p-link.io/mcp ------------------------------------------------------------------------ # 14. Summary P-Link provides a unified payment infrastructure for: - humans - APIs - AI agents Supported interfaces: - Payment Links - HTTP API - x402 protocol - MCP server This enables simple automated payments across the web and AI ecosystems.