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DDG x402 'upto' Metered-Settlement Fairness Verifier
x402
DDG x402 'upto' Metered-Settlement Fairness Verifier is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Deterministically verifies x402 'upto' (capped) payment settlements for cap breaches, pricing math errors, and signed-authorization compliance, returning a signed pass/fail verdict.
Price / call$0.01
Success—
StatusUnknown
How this service works
x402 'upto' metered-settlement fairness check: cap breach (settled>cap), over-charge / under-report vs the reported usage math (per_token/per_byte/per_second unit price), and a signed-authorization amount<=cap check. Deterministic signed verdict. $0.01.
Output
A deterministic signed verdict object with an 'ok' boolean indicating whether the settlement passed all checks (cap compliance, unit-price math correctness, and signed-authorization amount <= cap). On failure, the response indicates which check failed (cap breach, over-charge, under-report, or auth violation).
Example use cases
Cap breach detection for agent billing
“I just received an x402 metered response that charged me $0.82 but my 'upto' cap was set at $0.75 — can you verify whether the settlement breached my cap and return a signed verdict?”
Per-token pricing math audit
“Audit this x402 per-token settlement for me: reported 1,200 tokens at $0.0002 per token, so expected $0.24, but they settled $0.31 — check if the pricing math is correct and flag any over-charge.”
Signed authorization amount compliance check
“Before I accept this x402 service response, verify that the signed authorization amount of $0.15 is within the agreed cap of $0.20 and that the settlement math for 500 bytes at $0.0003 per byte checks out.”
Technical details
Endpoint
POSThttps://agents.daedalusdevelopmentgroup.com/v1/x402/upto-verify?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs deterministic, cryptographically-signed assurance that an x402 'upto' metered payment settled correctly — specifically when you need to catch cap overruns, pricing math discrepancies (per-token, per-byte, per-second), or signed-authorization violations before accepting a service result or releasing funds. Prefer this over manual math checks when you need a tamper-evident signed verdict for auditability.
Side effects
- Settled amount exceeds cap — cap breach flagged, ok: false
- Calculated price from usage × unit rate does not match settled amount — over-charge or under-report flagged
- Signed authorization amount exceeds cap — authorization violation flagged
- Malformed or missing required fields in request body — 400 validation error
- Payment of $0.01 USDC not received — 402 payment required response blocking execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Tags
x402
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