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fix(mcp): use scheme="exact" in X-Payment envelope so the facilitator actually accepts it #18

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Merged
Germey merged 1 commit into from
May 10, 2026
Merged

fix(mcp): use scheme="exact" in X-Payment envelope so the facilitator actually accepts it #18

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10 changes: 6 additions & 4 deletions api/routes/mcp.py
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Original file line number Diff line number Diff line change
Expand Up @@ -338,12 +338,14 @@ async def _tool_pay_for_api(
)

# Construct an X-Payment header that the facilitator understands.
# AceDataCloud's facilitator accepts
# `{"x402Version":1,"scheme":"solana","network":"solana","payload":{"signature":"<tx>"}}`
# base64-encoded as a single header value.
# The facilitator (FacilitatorX402) is x402-spec compliant: it matches
# `scheme="exact"` + `network="solana"` and reads the on-chain tx
# signature out of `payload.signature`. See
# https://github.com/AceDataCloud/FacilitatorX402 (`solana_chain.py
# ::_extract_signature`).
envelope = {
"x402Version": 1,
"scheme": "solana",
"scheme": "exact",
"network": "solana",
"payload": {"signature": result.tx_signature},
}
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