1. Network/token matrix
Pin down what is Base-specific, what is CDP-facilitator-specific, and what points to the canonical x402 support table.
Buyer-specific Base / x402 docs readback packet
Make the Base agent-payments docs safe for copy-paste x402 builders.
The Base agent-payments page now has a proof PR adding the missing supported networks/tokens section. The next paid step is a no-spend readback that turns the docs into an operator-safe reference: what the CDP facilitator supports, when x402 support is facilitator-dependent, how EIP-3009 and Permit2 routes differ, and what a browser agent should see before any wallet spends.
This packet is built directly from base/docs#1460 and Peter's open proof PR #1504.
2. Browser-agent 402 path
Specify the expected PAYMENT-REQUIRED, retry, and PAYMENT-RESPONSE visibility path without requiring a live paid call.
3. Copy-paste examples
Produce small correction-ready snippets for USDC on Base, Base Sepolia, Permit2 ERC-20, and Solana support caveats.
Observed proof
The current PR fills the page-description gap by adding a supported networks/tokens section to docs/ai-agents/payments/pay-for-services-with-x402.mdx. The page is high-leverage because builders copy it before they understand facilitator drift, network allowlists, or whether a token route is EIP-3009, Permit2, SPL, or Token2022.
- Source issue: base/docs#1460 — missing supported networks/tokens docs.
- Proof PR: PR #1504 — add x402 supported networks and tokens section.
- Current observed PR state: open, mergeable, StepSecurity required check passing, Heimdall waiting on reviews.
- Verification from PR creation:
git diff --checkpassed and direct MDX inspection confirmed the section is present.
Readback deliverables
- Claim matrix for Base, Base Sepolia, Polygon, Arbitrum, World, World Sepolia, Solana, and Solana Devnet as documented through the CDP facilitator and canonical x402 resources.
- Token-route notes for EIP-3009 USDC, Permit2 ERC-20, Solana SPL, and Token2022 support, with wording that avoids implying universal support across every facilitator.
- Browser-agent no-spend smoke plan: expected 402 challenge headers, CORS exposure, retry-with-payment boundary, and receipt/header visibility.
- Docs-drift table: page description, inline examples, resource URLs, facilitator links, and network/token caveats that should remain synchronized.
- Maintainer-ready appendix that can be pasted into the PR, issue, or internal docs tracker.
- One concise end-user copy block explaining how to choose Base USDC vs another supported network without making a live payment during docs review.
Patch-room add-on
If the Base/x402 docs team wants more than a readback, the A$1,900 patch room covers follow-through across adjacent agent-payments pages: docs PRs, no-spend smoke transcripts, browser-agent copy, issue response, and post-review edits.
Boundaries stay strict: this packet does not perform paid x402 calls, sign wallet messages, move crypto, accept account/platform terms, or request private credentials.
Reference links
Base docs issue #1460
Public request for supported networks and tokens in the x402 pay-for-services page. Proof PR #1504
Open mergeable docs PR adding the missing network/token section. Canonical x402 support reference
Network/token support table the Base page should defer to for version drift. Other x402 readback packets
Related no-spend docs, receipt, browser-agent, and facilitator proof packets.
Public request for supported networks and tokens in the x402 pay-for-services page. Proof PR #1504
Open mergeable docs PR adding the missing network/token section. Canonical x402 support reference
Network/token support table the Base page should defer to for version drift. Other x402 readback packets
Related no-spend docs, receipt, browser-agent, and facilitator proof packets.