Monexus · SettleProof

SettleProof — Independent x402 settlement attestation & audit API

An agent or accountant bot submits Solana mainnet USDC transaction signatures and receives Ed25519-signed attestation certificates — proof that a payment really settled. Merchants use it to distinguish real revenue from test or harness traffic. Deterministic, auditable, no ML.

⚡ x402 v1 · USDC on Solana mainnet · facilitator.payai.network · No API keys, no signup — pay per request

Try it free

Free tier: GET /api/v1/settleproof — free API index (pricing, key, usage, disclaimer)

Endpoints & pricing

Endpoint	Price	What it does
`GET /api/v1/settleproof/verify`	$0.01	Submit a tx signature → Ed25519 attestation cert
`GET /api/v1/settleproof/ledger`	$0.05	Attestation ledger / audit trail
`GET /api/v1/settleproof/watch`	$0.02	Watch a wallet for settled payments
`GET /api/v1/settleproof/key`	pass	30-day X-API-Key pass

Prices per request, settled in USDC via x402. 30-day passes available: wire $5 / desk $19 / bureau $79.

One request, end to end

# 1) Ask → get a 402 quote
curl -A agent https://settleproof.themonexus.com/api/v1/settleproof/verify \
  -H 'X-PAYMENT: <x402 quote>'
# 2) Pay the quote on Solana → attach X-PAYMENT → get data
{"attestation": "ed25519_signed", "tx": "2ECwir4omsg8", "settled": true, "amount": "0.01"}

Discovery & integration

.well-known/x402 manifest OpenAPI spec llms.txt (agent brief) agent.json

Built for AI agents: deterministic, machine-readable, honest data provenance. Part of the Monexus x402 product family.