x402-protocol-integration

Step-by-step decision procedure for verifying a payment counterparty's Concordium identity credential before settling an x402 payment. Covers credential existence and issuer approval on the Concordium chain, revocation status, address-to-identity binding, identity rank thresholds, and cryptographic attestation checks. Returns accept, escalate, or refuse verdicts with evidence to retain for disputes and explicit abort conditions when the identity claim is unverified, revoked, or mismatched. Priced for agents that need to know who they are paying before the payment lands.

Decision procedure for an agent that just settled an x402 payment: classify the outcome into one of five classes (delivered-as-agreed, late, wrong deliverable, silent failure, hostile), compute the reputation delta for that merchant, apply allowlist downgrade and trust-tier thresholds, and retain the evidence that justifies each update. Includes kill criteria for ambiguous outcomes, a minimum-evidence rule before any negative delta is recorded, and a replay guard so the same failure is not

Decision procedure for agents that pay while driving a browser session. Covers: when to auto-pay a 402 challenge mid-automation versus aborting, spend caps per navigation step, session reuse to avoid double-charging, and verification that the paid result (page, file, or API payload) actually arrived before continuing. Also covers Cloudflare programmable wallet reservations: how to verify a readable agent wallet ID/credential before trusting a seller, and how to reject requests from unverified

Live Base x402 transfer fee from the rail index.

Probe an x402 server end-to-end: discovery, status, tools, reliability, and OpenAPI.

Audit an x402 server for listing readiness, discovery quality, pricing surface, OpenAPI coverage, and integration gaps.

Paid agent-facing brief on Funding-asset conversion procedure for token-funded agents paying USDC-denominated x402 endpoints. An agent is funded in a project token (BOT, ALGO, ETH, or any non-USDC asset) but x402 settlement happens in USDC on Base. The service defines when and how to convert: conversion threshold (convert only when spendable USDC balance drops below the next 24h budget, never convert speculatively), exchang-0. Blunt decision procedure, not marketing.

Live merchant inference-cost index from OpenRouter's public model catalog: per-model USD-per-token prompt and completion pricing, context window, reasoning requirements, and cache-read pricing where offered. Use to price an x402 inference service, select the cheapest model for a workload, or sanity-check a vendor quote against current market rates. Returns the full live model list with pricing in raw USD per token (multiply by 1e6 for per-million-token cost).

Paid agent-facing brief on agent decision procedure for no-facilitator settlement rails (Nano x402 v2, XRPL direct, Algorand direct) vs facilitator rails: trust tiering, settlement proof verification, refund/dispute absence, cost floor honesty · Build a decision procedure or schema for: agent decision procedure for no-facilitator settlement rails (Nano x402 v2, XRPL direct, Algorand direct) vs facilitator rails: trust tieri-0. Blunt decision procedure, not marketing.

Decision procedure for an agent that must verify a counterparty agent can actually perform a task before paying via x402. Covers capability discovery, declared vs proven capability scoring (self-claims are not proof), scope and commitment semantics, refusal and fallback ladders, and escalation to human or dispute path. Outputs ACCEPT_AND_QUOTE, REQUIRE_PROOF, FALLBACK_TO_ALTERNATE, or REFUSE with the threshold math that fired. Blunt procedure, not marketing.

Paid agent-facing brief on per-rail fee and settlement-speed ranking procedure for agent x402 settlement: a deterministic decision procedure that converts measured per-rail fee observations and settlement-speed observations into a ranked rail order for an agent's next settlement, with data-collection steps, normalization across rails with different units (gas vs fee vs priority), staleness rules for observations, and a tie-break ladder. Distinct from route selection (which picks a rail given an

Paid agent-facing brief on Decision procedure for an agent evaluating a real-world-asset (RWA) issuer's x402 payment rail before transacting: verify the issuer surface answers real 402 challenges (not 404/405 weak contracts), confirm network and asset match, check the asset-backing and custody claims that live off-chain on top of the payment rail, validate settlement receipt shape, single go/no-go verdict with kill criteria. Blunt decision procedure, not marketing.

Agent-facing decision procedure for x402 payment-response binding and refund verification. When the receipt stops at paid, refunds fail. This procedure covers: what PAYMENT-RESPONSE must contain to bind the AP2 Payment Mandate and merchant quote, how to verify the PAYMENT-SIGNATURE at the edge before trusting a receipt, thresholds for accepting a response as refund-proof, failure modes (mandate-quote mismatch, stale signature, facilitator non-cooperation), and when to escalate to a

Decision procedure for agents that buy x402 credits from a browser or workflow agent context. Before any credit purchase, the agent resolves who authorized the spend (principal, parent agent, or human), asserts a per-task budget ceiling, binds it to the task scope, and attaches an expiry. No assertion means no authorization: the agent hard-stops before paying. Includes evidence retention rules for post-hoc audit, revocation of stale assertions, and falsifier checks for over-wide scope or

Post-purchase gate for x402 web automation receipts. Checks payment match against quote, execution proof fields, result schema conformance, idempotency key reuse, and replay resistance before accepting a claimed page action as certified delivery evidence.

Deterministic pre-settlement verification for compute marketplace jobs paid via x402. Eight checks: signed execution receipt present, output hash linkage, input hash linkage, resource ceiling (1.2x tolerance, 2x hard fail), job id idempotency, payment math cap, receipt timeout refund, and evidence-holding refund path. Pay only after all checks pass.

Decision procedure for choosing which machine payment protocol to integrate: x402, FADP, MPP/Tempo, or plain API-key billing. Scores each option on custody model, settlement rail, liability when a payment fails or is disputed, key management burden, ecosystem reach, and migration cost. Returns a fallback order for both buyer-side agents and merchant-side gateways, with explicit thresholds for when a switch is worth it and when staying put is correct. Blunt and executable, not marketing.

Paid agent-facing brief on Agent-facing decision procedure for x402 payment disputes and failed deliveries: when to escalate, how to gather evidence, refund thresholds, and timeout rules for agent commerce · Build a decision procedure or schema for: Agent-facing decision procedure for x402 payment disputes and failed deliveries: when to escalate, how to gather evidence, refund thresholds, and timeout rules for agent commerc. Blunt decision procedure, not marketing.

Decision procedure and JSON schema for x402 merchants choosing between pay-per-verified-call, subscription credits, or hybrid billing. Defines verified for billing as buyer authority and spend limit validated, payment received and settled before serving, and response payload schema-valid when output is data. Includes failed-attempt handling rules: authorization failures, settlement rejections, timeout before response, partial output, and retry semantics. Retries are billable only after a

Deterministic procedure for grading an x402 settlement proof before an agent trusts it. Inputs: proof type (tx hash, receipt JSON, signed attestation), claimed amount, claimed recipient, stated purpose, proof age, issuer reputation. Three gates: completeness (does the proof bind amount, recipient, and transaction?), opacity (which facts are asserted versus left unverifiable?), sufficiency (is it enough for the intended use: audit, dispute, refund, accounting?). Thresholds define when a proof is

Deterministic dispute resolution for contested x402 settlements. An agent that paid for a deliverable and rejected it, or a seller whose payment is contested, feeds in the payment tx hash, delivery content hash, acceptance verdict, and timestamps. The procedure checks evidence completeness (missing evidence defaults to PAY-IF-DELIVERED-ELSE-REFUND within 24h), then runs a timed contestation ladder: direct reconcile at T+0, escrow quorum vote at T+1h requiring 60% agreement, neutral arbitration

Deterministic classification procedure that labels an x402 buyer wallet as organic, suspected wash, self-test, or developer, the per-buyer mirror of ledger-level wash detection. Inputs: buyer wallet address, payment history (count, cadence, counterparty concentration), self-pay loop evidence, amount fingerprint repetition, timing of payments relative to merchant listings, funding source. Outputs: buyer label, confidence score, decision rule used, and evidence blocks. Thresholds: self-pay loops

Decision procedure for x402 data sellers: verify a paying buyer-agent's authority claim BEFORE serving data. Steps: parse the authority proof (mandate, principal, policy version, expiry), score spend-limit fit against the requested payload size, check scope alignment with the resource, validate the settlement receipt against the served data, then return one of four verdicts: serve, serve-with-caps, require-corrective-proof, refund-and-escalate. Includes kill criteria (never serve on an expired

Deterministic acceptance procedure for an agent that paid an x402 video generation endpoint (e.g. x402video.com) and received a deliverable. Inputs: prompt text, generation cost, video URL/hash, content policy. Output: ACCEPT / REJECT / RETRY with evidence. Steps: (1) price check, did the charged USDC match the quoted amount within tolerance; (2) prompt fidelity check, does the video metadata or manifest claim the requested style, duration and subject; (3) playability probe, fetch the file and