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.
npx agentmods add rules/dexter-dao/opendexter-ide/x402-codinggit 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/rules/dexter-dao/opendexter-ide/x402-coding)<a href="https://agentmods.dev/rules/dexter-dao/opendexter-ide/x402-coding"><img src="https://agentmods.dev/badge/rules/dexter-dao/opendexter-ide/x402-coding.svg" alt="Measured on agentmods" 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 | $0.00587 | $0.00587 |
| Opus 5 | $0.00293 | $0.00293 |
| Sonnet 5 | $0.00117 | $0.00117 |
| Haiku 4.5 | $0.00059 | $0.00059 |
Grade A, and why
x402-coding 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 4d 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.
What it actually says
x402-coding:
- Keep the two execution models separate:
- OpenDexter is a local proxy to a hosted governed runtime. It uses a stored OAuth bearer for account-bound tools and never uses a local signer or fallback.
@dexterai/x402is an independent application SDK. Its wallet adapters or application-owned keys do not inherit OpenDexter identity, authority, or limits and must never be substituted for a blocked OpenDexter operation.
- For OpenDexter, use exactly this flow:
x402_search→x402_check→ review and approval →x402_fetchwith onlyintentIdandmaxAmountAtomic. - Keep
intentIdopaque. It is server-owned and binds the exact request and seller terms. Never reconstruct or replace it. - After an uncertain fetch, call
x402_statuswith the sameintentId. Never auth-refresh and retry the consequential fetch after possible dispatch. x402_accessis a separate anonymous fresh one-call legacy wallet-proof operation. It is not Dexter OAuth or governed payment authority, preserves no cross-call continuity, and never accepts or persists access-session credentials. A non-GET access request needs separate approval and is never automatically retried.x402_walletanddexter_portfolioare account-bound and require the connected bearer. A balance or portfolio does not prove active governed authority.- For a deliberately independent
@dexterai/x402integration, import from subpaths, never from the root package:import { payAndFetch } from '@dexterai/x402/client'import { x402Middleware } from '@dexterai/x402/server'import { useX402Payment } from '@dexterai/x402/react'
- Install the tested V6 pair together:
@dexterai/[email protected]and@dexterai/[email protected], on Node 22 or newer. - Narrow the one-shot SDK's
PayResultonok, thenpaid. Apayment_unconfirmedresult may already have moved money and must not be automatically retried. Do not apply SDK recovery guidance to an OpenDexter fetch. wrapFetchandcreateX402Clientwere removed; never generate them.- Solana SDK payments require
feePayerin the accept'sextrafield. EVM payments do not.
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.
- 4d ago First seen · 43 lines · 587 tokens per session scan A 16ade7d7662a
x402-coding is a cursor rule published in the GitHub repository Dexter-DAO/opendexter-ide (2 stars, last pushed 15d ago), licensed MIT. It adds 587 tokens to every session, about $0.0029 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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