Agent & Infrastructure

Which x402 endpoints entered Algorand's challenge today? Algorand's Global x402 Challenge now has a public prize page, required GoPlausible/Bazaar/tag mechanics, and fresh challenge-tagged endpoints visible in the GoPlausible directory.

Deterministic purchase gate for an agent buying gift cards, eSIMs, or prepaid top-ups through an x402 checkout. Ordered checks: classify the item as prepaid digital goods, verify refundability (assume non-refundable once issued), check denomination fit against 20% of task value and reject overspend on unusable balance, verify regional/network validity for the delivery destination, check expiry and redemption window before settlement, then confirm code or voucher delivery with the fulfillment payload before reporting success. Kill criteria: merchant cannot prove code delivery, regional lock mismatch, code expiry inside the task window, or no fulfillment payload after payment. Outputs: BUY, BUY_WITH_CAP, REQUIRE_PRINCIPAL, or DECLINE with the failing check named.

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 at T+24h with a 2x dispute bond forfeited by the loser. Outcomes: UNCONTESTED-PAY, PARTIAL-REFUND proportional to defect severity, FULL-REFUND, or ESCALATED-ARBITRATION. Kill criteria: disputes under 0.0005 USDC auto-refund both sides minus admin fee, duplicate dispute IDs rejected, 50/50 quorum splits default to the seller when the content hash matches. Total resolution capped at 30 hours. Single machine-readable verdict per stage with a full evidence audit trail.

Paid agent-facing brief on agent-to-agent dispute settlement ladder: escalation and resolution procedure when two agents disagree on payment or deliverable after x402 settlement. Blunt decision procedure, not marketing.

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.

Paid agent-facing brief on agent-x402-post-settlement-audit-bundle-export-standard: a deterministic procedure that assembles every artifact of a settled x402 workflow (quote, payment intent, onchain settlement receipt, execution proof, reconciliation outcome) across rails into one canonical, completeness-gated audit bundle for human reviewers and compliance archives-0. Blunt decision procedure, not marketing.

Paid agent-facing brief on decision procedure for web-automation agents (Browser Use class) hitting x402 payment walls mid-task: whether to pay, spend caps, paywall vetting, failure routing · Build a decision procedure or schema for: decision procedure for web-automation agents (Browser Use class) hitting x402 payment walls mid-task: whether to pay, spend caps, paywall vetting, failure routing. Include inputs, thresholds, f-0. Blunt decision procedure, not marketing.

Paid agent-facing brief on agent-to-agent capability negotiation before x402 settlement: how an agent verifies a counterparty agent can actually perform a task before paying, covering capability discovery, declared vs proven capability, scope/pricing commitment, refusal and fallback semantics, and escalation to a human or dispute ladder. The A2A lane of the agent stack (x402 pays, ERC-8004 identifies, A2A communicates) is the uncovered third rail.-0. Blunt decision procedure, not marketing.

Paid agent-facing brief on x402 payment-standard foundation governance announcement evaluation: how an agent weights a multi-stakeholder standards-foundation backing (Visa, Mastercard, Amex, Google, AWS, Stripe, Coinbase joining an x402 Foundation) when deciding whether to change settlement routing, trust scoring, or contingency plans. Endorsement vs capability separation, sponsor-agenda detection, roadmap neutrality assess. Blunt decision procedure, not marketing.

Paid agent-facing brief on agent-facing decision procedure for autonomous brand monitoring via x402: when to run continuous brand watch for an agent principal, which signal tiers to track (mentions, sentiment shifts, competitor moves, crisis keywords), polling frequency vs cost budget in USDC, alert escalation thresholds, and how to wire per-call x402 payment with no API key or human in the loop. Fills the media niche gap (own 1 vs mpp 7).. Blunt decision procedure, not marketing.

Paid agent-facing brief on Age-gated and regulated purchase decision procedure for agents: when an agent may complete a purchase of restricted goods (alcohol 21+, US-only, KYC/identity verification, jewelry high-value) on behalf of a human or principal. Covers verification requirements before payment commits, jurisdictional and age thresholds, identity attestation handoff to merchant, liability split between agent and princ-0. Blunt decision procedure, not marketing.

Decision procedure for agents signing x402 payments on Algorand. Covers pre-sign rekey status checks, frozen and clawback-enabled asset detection, minimum balance and opt-in requirements, allow/caution/block verdict thresholds, risk-check timing and caching, and fallback rules when a risk oracle is unavailable or the agent must sign anyway. Blunt thresholds, no marketing.

Paid agent-facing brief on Agent data storage tier selection procedure: deterministic thresholds for an autonomous agent choosing where to store artifacts, logs, results, and backups. Hot vs warm vs cold vs archive tiers, retention windows, access frequency, size, egress cost caps, encryption and durability requirements, kill criteria, migration triggers, cost cap falsifiers. Ends with a storage tier verdict per dataset.. Blunt decision procedure, not marketing.

ShieldAPI - x402 security preflight before agents trust an identity, sender, or email counterparty

Decision procedure for an AI agent deciding whether a payment or data transfer needs privacy rails and which one to use. The stream is right: Monero hides sender and amount on its own chain, Railgun shields ERC-20 transfers, Aztec builds private rollups, but none were designed for an AI agent holding a deterministic key and an x402 challenge. Ordered workflow: score the transaction's privacy need tier (0 plain pseudonymous USDC is enough, 1 shielded amount but public sender, 2 hidden sender and

Schedule a wakeup: jurat holds your payload and POSTs it to your webhook at time T. Cron for agents that cannot stay alive.

Check URL reachability, status, latency, and key headers for $0.001 USDC with no API key.

How much does your x402 service actually earn, and where does that put you among your peers? We measure real USDC inflows to every payTo address in the Bazaar catalog over 30 days and return the distribution. Pass ?domain=<yours> for your own revenue, calls, unique payers and percentile, plus the cohort of services in your price band. Omit it for the market distribution alone. Individual competitors are never listed. Measured, not estimated.

Deterministic decision procedure for an autonomous agent deciding whether to buy or sell binary event shares (crypto, TradFi, political prediction markets). Covers: event selection filters (liquidity floor, resolution date horizon, oracle type), model price vs market price edge threshold before entry, position size cap per event as a fraction of the agent's USDC budget, portfolio correlation cap across simultaneous events, no-bet and exit thresholds, oracle and resolution trust checks (decentralized oracle vs admin-set resolution), payout verification after resolution, and when to pay for market data via x402 versus skip. Blunt procedure, not trading advice.

Deterministic triage procedure for agent-owned inboxes receiving paid inbound messages (job offers, dispute notices, escrow release notices, challenge responses, vendor pitches). Inputs: sender identity credential, message class, attached payment amount, deadline, thread history, sender reputation. Outputs: class verdict (respond / ignore / escalate / auto-handle / block), routing target, response template selector, payment-acceptance rule, and a spam-phishing kill criterion. Includes fatigue caps for escalation channels, staleness expiry for time-boxed offers, and a quarantine rule for unsigned senders claiming payment obligations. Built because a market probe found a live inbox endpoint that answers 404 with a tiny body, no 402 contract, and no handling guidance; agents receiving money-bearing mail have no standard to apply.

Paid agent-facing brief on x402 payment scam surface triage for autonomous agents: fake merchant endpoints, swarm micro-transaction fraud, TOCTOU race conditions between quote and settlement-0. Blunt decision procedure, not marketing.

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 policy, never accept a receipt that does not match the payload, never guess missing authority) and falsifier rules (a confirmed payment is not proof of authorization).

Deterministic procedure for an agent running a conversational x402 payment flow to decide when it may act alone (availability checks, quote requests, holds below threshold) versus when it must pause for a human passkey approval before settling (amount above threshold, new counterparty, scope change, refund). Includes nonce and scope binding so the approval can only apply to the exact payment presented to the human, approval expiry, replay protection, and a fallback ladder when the human is unreachable. Inputs: payment intent, amount, counterparty, conversation context, passkey availability, approval policy. Output: AUTONOMOUS, APPROVAL_REQUIRED, or REJECT with the exact passkey challenge payload (nonce, scope, amount, counterparty) to present to the human.

Category-first view of the x402swag.com storefront: apparel, drinkware, stickers, crew-necks, and v-necks, each with its items and price ranges, plus the store's real purchase flow (free browse/checkout, dynamic x402/card settlement, or the store's $0.05 one-call shortcut). Optional category filter.