Add OPG token Permit2 approval utilities for x402 payments - #8

Merged
adambalogh merged 2 commits into
mainfrom
claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged

Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom
claude/check-opg-approval-workflow-weK8b

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@adambalogh

@adambaloghadambalogh commented May 5, 2026•
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Summary

This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.

Key Changes

  • New opgToken.ts module with Permit2 approval management:

    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units

  • Exported public API:

    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results

  • Updated index.ts to export new OPG approval utilities

Notable Implementation Details

  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures

claude added 2 commits May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh merged commit e271f9c into mainMay 5, 2026
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@adambalogh@claude
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Add OPG token Permit2 approval utilities for x402 payments - #8
Merged
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged
Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
Conversation
@adambalogh
@adambaloghadambalogh
commented
May 5, 2026•

edited

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Summary
This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.
Key Changes
  • New opgToken.ts module with Permit2 approval management:
    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units
  • Exported public API:
    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results
  • Updated index.ts to export new OPG approval utilities
Notable Implementation Details
  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures
claude
added 2 commits
May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh
merged commit e271f9c
into
mainMay 5, 2026

5 checks passed

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@adambalogh@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Add OPG token Permit2 approval utilities for x402 payments - #8
Merged
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged
Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
Conversation
@adambalogh
@adambaloghadambalogh
commented
May 5, 2026•

edited

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Contributor
Summary
This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.
Key Changes
  • New opgToken.ts module with Permit2 approval management:
    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units
  • Exported public API:
    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results
  • Updated index.ts to export new OPG approval utilities
Notable Implementation Details
  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures
claude
added 2 commits
May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh
merged commit e271f9c
into
mainMay 5, 2026

5 checks passed

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2 participants

@adambalogh@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Add OPG token Permit2 approval utilities for x402 payments - #8
Merged
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged
Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
Conversation
@adambalogh
@adambaloghadambalogh
commented
May 5, 2026•

edited

Loading

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Contributor
Summary
This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.
Key Changes
  • New opgToken.ts module with Permit2 approval management:
    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units
  • Exported public API:
    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results
  • Updated index.ts to export new OPG approval utilities
Notable Implementation Details
  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures
claude
added 2 commits
May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh
merged commit e271f9c
into
mainMay 5, 2026

5 checks passed

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2 participants

@adambalogh@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Add OPG token Permit2 approval utilities for x402 payments - #8
Merged
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged
Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
Conversation
@adambalogh
@adambaloghadambalogh
commented
May 5, 2026•

edited

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Contributor
Summary
This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.
Key Changes
  • New opgToken.ts module with Permit2 approval management:
    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units
  • Exported public API:
    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results
  • Updated index.ts to export new OPG approval utilities
Notable Implementation Details
  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures
claude
added 2 commits
May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh
merged commit e271f9c
into
mainMay 5, 2026

5 checks passed

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2 participants

@adambalogh@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Add OPG token Permit2 approval utilities for x402 payments - #8
Merged
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged
Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
Conversation
@adambalogh
@adambaloghadambalogh
commented
May 5, 2026•

edited

Loading

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Copy Markdown

Contributor
Summary
This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.
Key Changes
  • New opgToken.ts module with Permit2 approval management:
    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units
  • Exported public API:
    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results
  • Updated index.ts to export new OPG approval utilities
Notable Implementation Details
  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures
claude
added 2 commits
May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh
merged commit e271f9c
into
mainMay 5, 2026

5 checks passed

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2 participants

@adambalogh@claude

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
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Add OPG token Permit2 approval utilities for x402 payments - #8
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adambalogh merged 2 commits into
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claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged
Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
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@adambalogh
@adambaloghadambalogh
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May 5, 2026•

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Summary
This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.
Key Changes
  • New opgToken.ts module with Permit2 approval management:
    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units
  • Exported public API:
    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results
  • Updated index.ts to export new OPG approval utilities
Notable Implementation Details
  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures
claude
added 2 commits
May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh
merged commit e271f9c
into
mainMay 5, 2026

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Skip to content
Add OPG token Permit2 approval utilities for x402 payments - #8
Merged
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
May 5, 2026
Merged
Add OPG token Permit2 approval utilities for x402 payments#8
adambalogh merged 2 commits into
mainfrom 
claude/check-opg-approval-workflow-weK8b
Conversation
@adambalogh
@adambaloghadambalogh
commented
May 5, 2026•

edited

Loading

Copy link


Copy Markdown

Contributor
Summary
This PR adds utilities for managing OPG token Permit2 approvals on Base mainnet, enabling seamless integration with x402 payment infrastructure. The new module provides a high-level API for ensuring sufficient allowances with minimal transaction overhead.
Key Changes
  • New opgToken.ts module with Permit2 approval management:
    • ensureOpgApproval() - Main function that checks and maintains minimum Permit2 allowance thresholds
    • Helper functions for reading allowances, balances, and sending approval transactions
    • Utility functions for converting between OPG decimal amounts and base units
  • Exported public API:
    • ensureOpgApproval() - Idempotent approval function for backend services
    • BASE_OPG_ADDRESS - OPG token contract address on Base
    • BASE_MAINNET_RPC - Base mainnet RPC endpoint (configurable via env var)
    • Permit2ApprovalResult - Type for approval operation results
  • Updated index.ts to export new OPG approval utilities
Notable Implementation Details
  • Smart approval buffering: Defaults to approving 2x the minimum threshold to reduce transaction frequency across service restarts
  • Robust confirmation handling: Polls allowance state after transaction confirmation to ensure visibility before returning
  • Balance validation: Checks wallet balance before approval and caps approval amount if needed
  • Precision-safe conversion: Uses string arithmetic for OPG amount conversions to avoid floating-point precision loss
  • Configurable RPC: Supports BASE_MAINNET_RPC environment variable for custom RPC endpoints
  • Comprehensive error handling: Provides clear error messages for insufficient balance, invalid amounts, and transaction failures
claude
added 2 commits
May 5, 2026 15:39
@claude
Add OPG token Permit2 approval workflow
690369f
Port ensureOpgApproval from the Python SDK (src/opengradient/client/opg_token.py).
Checks the Permit2 allowance for the OPG token on Base mainnet and only
sends an approve tx when the current allowance falls below minAllowance,
approving approveAmount (default 2x minAllowance) so subsequent restarts
are free.
Uses viem and the PERMIT2_ADDRESS constant re-exported from @x402/evm.
@claude
Document ensureOpgApproval in README with end-to-end example
09757af
Mirrors the OPG Token Approval section in the Python SDK README so
users discover the approval step before their first LLM call.
@adambalogh
adambalogh
merged commit e271f9c
into
mainMay 5, 2026

5 checks passed

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2 participants

@adambalogh@claude