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x402 Protocol v2 Migration: Key Changes and Undocumented Traps

By PulseAugur Editorial · [1 sources] ·

The author details a migration from x402 v1 to v2, noting that v2 is a significant departure rather than a simple upgrade. Key changes include a shift to the @x402 npm scope, the introduction of CAIP-2 for networks, and the relocation of payment challenges from the JSON body to the PAYMENT-REQUIRED header. The article also highlights new client-side scheme handling and the integration of Bazaar discovery for paid routes. AI

IMPACT Provides a technical guide for developers migrating to the x402 protocol v2, detailing changes and potential pitfalls.

RANK_REASON This is a technical guide on migrating a specific software protocol, not a new release or significant industry event.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

x402 Protocol v2 Migration: Key Changes and Undocumented Traps

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This is a technical guide on migrating a specific software protocol, not a new release or significant industry event.
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117 days old
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · FiatDock ·

    Migrating to x402 v2: what actually changed (and the traps nobody documents)

    <p>We run <a href="https://fiatdock.com" rel="noopener noreferrer">FiatDock</a> — a non-custodial USDC ↔ bank on/off-ramp where AI agents pay $0.05 per call over x402. This week we migrated the whole stack (Express server, fetch client, MCP server) from x402 v1 to protocol v2. It…

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