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x402 payment protocol adapter with two surfaces. The receiver helpers build the HTTP 402 challenge body, decode the X-PAYMENT request header, and drive the full verify-then-settle flow against any RFC-compatible facilitator. The facilitator client (CoinbaseFacilitator) talks to the Coinbase Developer Platform’s hosted x402 facilitator, or any self-hosted alternative that speaks the same /verify + /settle JSON-RPC. Per the OSS Cathedral plan §M2.5: every Glide account is x402-addressable by default. This package is what makes that true. The matching MCP tools (x402.pay, x402.receive) in apps/mcp consume this package’s primitives. F1 IRON RULE: SettleResponse.transaction (the facilitator’s returned tx hash) is the facilitator’s claim, not an independently verified on-chain fact. Operators MUST perform a server-side RPC verification before persisting the hash to any audit row. This package exposes the facilitator’s response verbatim and leaves RPC verification to the consumer. The reference implementation is serverFetchChainTx in the MCP x402.pay tool.

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Install

This package is workspace-internal (@repo/connectors-coinbase-x402). For standalone use, publish it under @glideco/connector-coinbase-x402 using the connector publish script: 
node scripts/publish-glide-connector.mjs coinbase-x402

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Receiver flow (Next.js route handler)

The canonical pattern for exposing a Glide account as an x402 endpoint: 
// apps/web/src/app/api/x402/[accountId]/route.ts
import {
  CoinbaseFacilitator,
  buildChallengeBody,
  handleX402Request,
  type PaymentRequirements,
} from '@repo/connectors-coinbase-x402';

export async function POST(req: Request, { params }: { params: Promise<{ accountId: string }> }) {
  const { accountId } = await params;

  const requirements: PaymentRequirements = {
    scheme: 'exact',
    network: 'base',
    maxAmountRequired: '1000000',           // 1 USDC (6 decimals)
    resource: req.url,
    description: 'Pay to unlock resource',
    mimeType: 'application/json',
    payTo: process.env.X402_DEFAULT_RECEIVE_ADDRESS!,
    maxTimeoutSeconds: 60,
    asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', // USDC on Base
  };

  const facilitator = new CoinbaseFacilitator({
    bearerToken: process.env.CDP_API_KEY_SECRET,
  });

  const result = await handleX402Request({
    xPaymentHeader: req.headers.get('x-payment'),
    accepts: [requirements],
    facilitator,
  });

  if (result.kind === 'challenge') {
    return new Response(JSON.stringify(result.body), { status: 402 });
  }

  // F1: independently verify the on-chain tx before writing any audit row
  await rpcVerify(result.settle.transaction, requirements);
  return Response.json({ ok: true, tx: result.settle.transaction });
}

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ReceiverOutcome decision tree

handleX402Request returns a discriminated union: 
type ReceiverOutcome =
  | {
      kind: 'challenge';
      body: X402ChallengeBody;
      reason: 'no_header' | 'header_decode' | 'verify_failed' | 'settle_failed';
      detail?: string;
    }
  | {
      kind: 'settled';
      settle: SettleResponse;
    };
All failure cases return kind: 'challenge' with the appropriate reason and a detail string for logging. The caller emits a 402 with body as the JSON payload in all challenge cases.

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Building a challenge manually

If you need to issue a 402 without driving a full payment flow: 
import { buildChallengeBody, encodeXPaymentHeader } from '@repo/connectors-coinbase-x402';

// 402 response body
const challengeBody = buildChallengeBody({
  accepts: [requirements],
  error: 'Previous payment verification failed',
});

// Encode a PaymentPayload into the X-PAYMENT header (client side)
const xPaymentHeader = encodeXPaymentHeader({
  x402Version: 1,
  scheme: 'exact',
  network: 'base',
  payload: { signature: '0x…', authorization: { from, to, value, validAfter, validBefore, nonce } },
});

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Self-hosted facilitator

To run without a Coinbase dependency, point the client at any RFC-compatible facilitator: 
X402_FACILITATOR_URL=https://my-facilitator.example.com
CoinbaseFacilitator calls the same /verify + /settle JSON-RPC contract against that base URL. The Glide-compliant facilitator (with Chainalysis screening) is in @glideco/x402-facilitator.

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Egress surface

Declared in the connector manifest (enforced by the egress-host CI gate):
HostPurpose
api.cdp.coinbase.comCoinbase Developer Platform auth + key APIs
x402.coinbase.comCoinbase-hosted x402 facilitator
facilitator.x402.ioFallback / community-hosted facilitator
No other host is reachable at runtime. A CI gate on egress hosts enforces this.

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Supported networks

The PaymentRequirements.network field accepts the x402 network enum: base, base-sepolia, polygon, polygon-amoy, solana, solana-devnet, avalanche, abstract, sei, and several others. See PaymentRequirementsSchema in src/protocol.ts for the full list. For EVM networks the payload uses EIP-712 transferWithAuthorization; for Solana the payload is a signed transaction blob. Both shapes are handled by the same decodeXPaymentHeader parser.

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Reading list