Submit a cumulative CallVoucher (Phase 2.1 — flag-gated)

Machine-to-Machine Conformance API · session-voucher

$0 / call 3 free calls/day No signup

Present the next cumulative CallVoucher for an open session; S1–S8 checks run inside one Durable Object transaction (replay-safe, monotonic nonce, per-call + total caps, exact price, signature last). Returns the updated remaining session balance. EXPERIMENTAL: disabled unless SESSION_CHANNELS=true. Verification only — no funds move per call.

Honest Scope Guarantee

Deterministic, offline, explainable — no ML, no scraping. The response's scope field states the exact assurance level.

Run in Playground (Free) Buy Card Credits Agent Quickstart

Quickstart & Execution

cURL (20 Free Calls/Day • Zero Authentication Required)

curl -X POST https://rail.akrivis.in/v1/tools/session-voucher/call \
  -H "content-type: application/json" \
  -d '{"voucher":{"sessionId":"0x…","callNonce":"1","cumulative":"5000","inputHash":"0x…"},"signature":{"r":"0x…","s":"0x…","v":27},"quoted_minor":"5000"}'

No API key needed for the free daily tier. When daily quota exhausts, the endpoint replies with HTTP 402 Payment Required specifying the exact USDC amount. Machines sign an EIP-3009 transfer on Base L2; human engineers buy card credits. Every paid execution returns a cryptographically signed XDR-1 receipt for zero-knowledge audit trails.

Input Parameters

Field	Type	Meaning & Constraints
`voucher` (REQUIRED)	`object`	CallVoucher { sessionId, callNonce, cumulative, inputHash } — strictly increasing nonce + cumulative
`signature` (REQUIRED)	`object`	{ r, s, v } over the voucher's EIP-712 digest
`quoted_minor` (REQUIRED)	`string`	Price of THIS call in atomic units (decimal string); the voucher delta must equal it exactly (S7)
`idempotency_key`	`string`	Optional; an exact retry replays the recorded response, a different payload with the same key conflicts

Response Format

Deterministic JSON payload fields: accepted, decision, decision_code, charge_minor, remaining, scope. Paid responses also carry an offline-verifiable receipt object (XDR-1, secp256k1 signature recoverable to the authorized signer).

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