INNER CODE UNIT · JavaScript

PaymentRequiredError

nirholas/XActions · packages/xactions-edge/index.js:54

export class PaymentRequiredError extends XActionsError {
  /**
   * @param {string} tool
   * @param {object} payload The server's x402 body.
   */
  constructor(tool, payload) {
    const accepts = payload?.accepts || [];
    const first = accepts[0] || {};
    const decimals = 6; // USDC on both supported chains
    const amount = Number(first.maxAmountRequired ?? first.amount ?? 0) / 10 ** decimals;
    const price = amount ? `$${amount.toFixed(6).replace(/0+$/, '').replace(/\.$/, '')}` : 'a fee';
    const chains = accepts.map((entry) => NETWORK_NAMES[entry.network] || entry.network);
    super(
      `${tool} costs ${price} in USDC (${chains.join(' or ') || 'x402'}). `
      + 'Pay with an x402 client and retry: https://xactions.app/docs/guides/x402',
      { tool, status: 402 },
    );
    this.name = 'PaymentRequiredError';

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