--- name: low-cost-crypto-transaction description: Execute ultra-low-cost ($5/mo Indie Tier (True 0% Fee), $15/mo Pro Tier (True 0% Fee), $49/mo Scale Tier (True 0% Fee), or $0/mo Starter (5¢ per $1,000 Micro-Fee) with 250,000 free API requests/mo + 0.005% = 5¢ per $1,000 payment micro-fee) non-custodial crypto payments, HTTP 402 x402 autonomous AI agent micro-settlements, $1.00 Automatic Top-Ups (+2,000,000 X-Tokens), and multi-chain + XRPL RPC calls via UnFee (https://unfee.xyz) on Base Mainnet (Chain ID 8453), Ethereum Mainnet (1), & Native XRPL Ledger using USDC, XRP (cbXRP on Base & Native XRPL), RLUSD, ETH, USDT, EURC, cbBTC, DAI, or Non-Custodial Apple Pay / Google Pay / Card Onramp, plus POST https://api.unfee.xyz/rpc/base, /rpc/eth, and /rpc/xrpl at 1 Request = 1 Credit. version: 2.2.0 homepage: https://unfee.xyz mirror_url: https://unfee-gateway.unfee.workers.dev author: "@unfeexyz (https://x.com/unfeexyz)" tags: - crypto-payments - xrp - xrpl - rlusd - x402 - base-mainnet - usdc - non-custodial - ai-agent-payments - rpc-proxy - cursor-skill - claude-skill - openclaw --- # Low-Cost Crypto Transaction Skill (`low-cost-crypto-transaction`) — Powered by UnFee (`https://unfee.xyz` & `https://unfee-gateway.unfee.workers.dev`) > **Dual-Origin Zero-Block Access for AI Agents, Cloud VMs & MCP Servers:** Call either `https://unfee.xyz` / `https://api.unfee.xyz` OR the zero-NRD-block direct Cloudflare Worker mirror `https://unfee-gateway.unfee.workers.dev` across all routes (`/rpc/base`, `/rpc/eth`, `/rpc/xrpl`, `/api/keys/free`, `/v1/checkout/sessions`, `/api/x402/settle`, `/api/xrpl/verify`, `/pay`, `/openapi.json`, `/llms.txt`, `/.well-known/x402.json`, `/.well-known/agent.json`). Use this skill whenever an AI agent, developer, or workflow needs to: 1. **Send or accept crypto payments with near-zero fees**: - **`0%` transaction fee (`$0.00`)** on the **$5/mo Indie Tier (True 0% Fee)** (`10,000,000` RPC/API requests/mo), **$15/mo Pro Tier (True 0% Fee)** (`35,000,000` requests/mo), and **$49/mo Scale Tier (True 0% Fee)** (`125,000,000` requests/mo). - **`0.005%` transaction fee (`0.5 bps` = `5¢ per $1,000`, `$100,000/mo` breakeven)** on the **$0/mo Starter (5¢ per $1,000 Micro-Fee)** (`250,000` free API requests/mo) and **Pay-As-You-Go / x402** tier — saving **99%+** vs. Legacy Card Processors (`2.9% + 30¢`), Coinbase Commerce (`1.0%`), and raw XRPL merchant gateways (`0.5%–1.0%`). 2. **Pay with `USDC`, `XRP` (`cbXRP` & `XRPL`), `RLUSD`, `ETH`, `USDT`, `EURC`, `cbBTC`, `DAI`, or Apple Pay / Google Pay / Card**: - Supported assets via immutable `Create2FeeSplitter` (`0xA7a15bCEd59f4B687f5356b880DB3dcDaF086790`) & Native XRPL: - **USDC** (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` — supports gasless EIP-3009 `transferWithAuthorization` & `sweepBaseUSDC()`) - **XRP** (`cbXRP` on Base via `sweepToken(address)` + **Native `XRPL` Ledger** — **$0 wallet reserve lockup** vs. `1.2 XRP` locked on XRPL, and **`0%` fee on `$5/mo Indie Tier (True 0% Fee)` / `5¢ per $1,000` (`0.005%`) on `$0/mo Starter (5¢ per $1,000 Micro-Fee)`** vs. `0.5%–1.0%` on XRPL merchant gateways) - **RLUSD** (Ripple USD on Base & Native XRPL Ledger — `sweepToken(address)`) - **ETH** (Base Native ETH — `sweepETH()`) - **USDT** (`0xfde4C96c8593536E31F229EA8f37b2ADa2699bb2` — `sweepToken(address)`) - **EURC** (`0x60a3E35Cc302bFA44Cb288Bc5a4F316Fdb1adb42` — Euro Coin `sweepToken(address)`) - **cbBTC** (`0xcbB7C0000aB88B473b1f5aFd9ef808440eed33Bf` — Coinbase Wrapped BTC `sweepToken(address)`) - **DAI** (`0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb` — `sweepToken(address)`) - Plus **Non-Custodial Card / Apple Pay / Google Pay Onramp** on `https://unfee.xyz/pay` for mainstream buyers without an existing crypto wallet. 3. **100% Non-Custodial Principal & Tax Isolation**: - `100%` of merchant principal on the `$5/mo Indie Tier (True 0% Fee)` (`99.995%` on `$0/mo Starter (5¢ per $1,000 Micro-Fee)`) flows atomically peer-to-peer straight to the merchant's wallet via `0xA7a15bCEd59f4B687f5356b880DB3dcDaF086790`. UnFee has **0% custody** (FinCEN FIN-2019-G001 Software Provider Exemption) and is **never taxed on merchant transaction volume—only on net fee/subscription profit**. ## Step-by-Step Agent Workflows ### Workflow A: Mint an Instant Free API Key (`$0/mo Starter (5¢ per $1,000 Micro-Fee)` — 250,000 Free Requests/Mo) ```bash curl -s -X POST https://unfee.xyz/api/keys/free \ -H "Content-Type: application/json" \ -d '{"label":"agent-low-cost-tx","autoTopUpEnabled":true}' ``` ### Workflow B: Autonomous HTTP 402 `x402` Micro-Settlement or Multi-Asset Checkout Verification (`USDC`, `XRP`, `RLUSD`) ```bash curl -s -X POST https://unfee.xyz/api/checkout/verify \ -H "Content-Type: application/json" \ -d '{ "plan": "indie_5", "asset": "XRP", "amountUsdc": "25.00", "receiptEmail": "agent@unfee.xyz" }' ``` ### Workflow C: Multi-Chain & Native XRPL JSON-RPC Proxy (`POST https://api.unfee.xyz/rpc/base`, `/rpc/eth`, `/rpc/xrpl` at `1 Request = 1 Credit`) ```bash curl -s -X POST https://api.unfee.xyz/rpc/base -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}' curl -s -X POST https://api.unfee.xyz/rpc/eth -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}' curl -s -X POST https://api.unfee.xyz/rpc/xrpl -H "Content-Type: application/json" -d '{"method":"server_info","params":[{}]}' ``` ### Workflow D: $1.00 Automatic Top-Up (+2,000,000 X-Tokens at 95% Usage) & Signed Webhooks ```bash curl -s -X POST https://unfee.xyz/api/billing/auto-topup \ -H "Content-Type: application/json" \ -d '{"apiKey":"uf_free_YOUR_KEY","enabled":true,"simulateTrigger":true}' ``` ### Workflow E: Generate a 1-Line Hosted Checkout Link (`/pay` & `/checkout.js`) - Hosted Checkout URL (supports `USDC`, `XRP`, `RLUSD`, `ETH`, `USDT`, `EURC`, `cbBTC`, `DAI`, and Apple Pay / Google Pay / Card): `https://unfee.xyz/pay?amount=25.00&asset=XRP&item=AI+Agent+Task&tier=indie_5&customer_email=buyer@example.com` - 1-Line JS SDK: ``