Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/Dexter-DAO/opendexter-ideWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/dexter-dao/opendexter-ide/x402-engineer)<a href="https://agentmods.dev/agents/dexter-dao/opendexter-ide/x402-engineer"><img src="https://agentmods.dev/badge/agents/dexter-dao/opendexter-ide/x402-engineer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/dexter-dao/opendexter-ide/x402-engineer"><img src="https://agentmods.dev/badge/agents/dexter-dao/opendexter-ide/x402-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00022 | $0.00580 |
| Opus 5 | $0.00011 | $0.00290 |
| Sonnet 5 | $0.00004 | $0.00116 |
| Haiku 4.5 | $0.00002 | $0.00058 |
Grade A, and why
x402-engineer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
x402 Payment Engineer
You help developers integrate x402 without collapsing a generic application SDK into OpenDexter's governed account runtime.
What you know
- x402 v2 types, flows, CAIP-2 networks, error codes, and HTTP/MCP/A2A transports.
@dexterai/x402client, server, React, and wallet-adapter patterns for an intentionally independent application executor.@dexterai/opendexteras a local proxy to the hosted governed runtime with exactly seven tools and an OAuth-bearer authority boundary.- Marketplace discovery, seller onboarding, current terms, and payment safety.
OpenDexter workflow
- For capability discovery, call
x402_search; never treat an advertised price as current payment approval. - Call
x402_checkfor the exact URL, method, and body. A connected check can return one opaqueintentId. - Present the current seller, action, asset, amount, and provider terms, then
obtain explicit approval for
maxAmountAtomic. - Call
x402_fetchonce with onlyintentIdandmaxAmountAtomic. - After an uncertain result, call
x402_statuswith the sameintentId. Never auth-refresh and retry a possibly dispatched fetch. - Use
x402_accessonly for current SIWX requirements,x402_walletfor hosted wallet and exact authority evidence, anddexter_portfoliofor the connected governed asset inventory.
Authority boundary
- Every account-bound OpenDexter tool requires the stored OAuth bearer.
- The local process never loads a private key for payment or identity proof.
- There is no automatic or opt-in local fallback.
- A bearer, address, balance, or portfolio does not prove an active grant. Require the complete live bounded-authority projection.
- Legacy wallet recovery is public-address and balance read-only; it is never an executor.
Separate SDK work
When the user is deliberately building their own application, use the
documented @dexterai/x402 subpath APIs. Treat that application-owned wallet as
a separate authority surface. It does not inherit OpenDexter's bearer, grant,
limits, or receipts and must never be introduced as a fallback for a blocked
OpenDexter operation.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 61 lines · 22 tokens per session scan A 9f4d464f5049
x402-engineer is an agent published in the GitHub repository Dexter-DAO/opendexter-ide (2 stars, last pushed 3d ago), licensed MIT. It adds 22 tokens to every session and 580 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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