fix(x402): update payment headers to v2 spec#20
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Migrate Ask Arc endpoint from legacy x-402-payment header format
(stx:{address}:{txid}:{amount}:STX) to x402 v2 spec using standard
headers: payment-required, payment-signature, payment-response.
- handlers.ts: Use lib/x402 buildPaymentRequired + verifyPayment
(same pattern as research routes), return payment-required on 402
and payment-response on 200
- Services.tsx: Update curl example to show v2 two-step flow (probe
then pay), fix AskArcForm to send payment-signature header with
base64-encoded PaymentPayloadV2, update button text to sats
- landing.ts: Update curl example to show v2 flow with correct
header names and relay discovery link
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
/api/ask-arc) from legacyx-402-paymentheader format to x402 v2 spechandlers.tsto uselib/x402.ts(same pattern as research routes) — returnspayment-requiredheader on 402, acceptspayment-signature, returnspayment-responseon 200Before:
x-402-payment: stx:{address}:{txid}:{amount}:STX(custom, non-standard)After:
payment-required/payment-signature/payment-response(x402 v2 standard, base64-encoded JSON payloads, relay settlement via x402-relay.aibtc.com)Test plan
POST /api/ask-arcwithout payment returns 402 withpayment-requiredheaderpayment-requiredheader decodes to validPaymentRequiredV2JSONPOST /api/ask-arcwith validpayment-signatureheader returns 200 +payment-responsenpm run build:clientsucceeds🤖 Generated with Claude Code